Updated on 2026/07/23

写真a

 
WADA Takahiro
 
Organization
Faculty of Engineering Science Professor
Title
Professor
Contact information
メールアドレス
External link

Degree

  • Ph.D.

Research Interests

  • biological effects of radiation, mathematical model

  • Superheavy Elements, Fluctuation-Dissipation Dynamics, Nuclear Reaction

Research Areas

  • Natural Science / Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics

  • Environmental Science/Agriculture Science / Radiation influence  / Mathematical model

Education

  • Kyoto University   Graduate School, Division of Natural Science

    1981.4 - 1986.3

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  • Kyoto University   Faculty of Science

    1977.4 - 1981.3

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    Country: Japan

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Research History

  • 甲南大学 助教授

    1995.4 - 2007.3

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  • 大阪歯科大学 専任講師

    1993.4 - 1995.3

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  • 理化学研究所 基礎科学特別研究員

    1989.10 - 1993.3

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  • 日本学術振興会 特別研究員

    1988.4 - 1989.9

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  • 京都大学基礎物理学研究所 研究員

    1986.4 - 1988.3

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Professional Memberships

  • The Japanese Radiation Research Society

    2021.9 - Present

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  • Atomic Energy Society of Japan

    2010.3 - Present

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  • The Physical Society of Japan

    1983.3 - Present

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Committee Memberships

  • 日本学術振興会 産学協力研究委員会 第195委員会「放射線の利用と生体影響」   副委員長  

    2019.4 - Present   

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  • 日本学術振興会 研究開発専門委員会「放射線の生体影響の分野横断的研究」   委員長  

    2015.10 - 2018.9   

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Papers

  • An analysis of the effects of chronic low dose-rate radiation exposure on cancer focusing on the differences among cancer types

    Tetsuhiro Kinugawa, Ignacia Braga Tanaka, Satoshi Tanaka, Yuichiro Manabe, Fuminobu Sato, Takahiro Wada

    International Journal of Radiation Biology   100 ( 6 )   903 - 911   2024

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1080/09553002.2024.2338551

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  • Example of the misleading results caused by LQ model in calculating the fractionation effect in radiation therapy

    M. Bando, Y. Onoue, Y. Tsunoyama, K. Suzuki, Y. Takanishi, J. Sato, T. Wada, H. Toki

    Annals of the ICRP   52 ( (1-2) Annex )   17 - 21   2023.12

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    Publishing type:Research paper (scientific journal)   Publisher:International Commission on Radiological Protection  

    DOI: 10.54320/msfd3710

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  • A mathematical model for radiation-induced life-shortening attributed to cancer Reviewed

    Tetsuhiro Kinugawa, Ignacia Braga Tanaka, Satoshi Tanaka, Yuichiro Manabe, Fuminobu Sato, Takahiro Wada

    International Journal of Radiation Biology   1 - 7   2023.9

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Informa UK Limited  

    DOI: 10.1080/09553002.2023.2261529

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  • Four-dimensional Langevin approach to fission with Cassini shape parameterization Reviewed

    Kazuki Okada, Takahiro Wada, Nicolae Carjan

    EPJ Web of Conferences   284   04018 - 04018   2023.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:EDP Sciences  

    We apply the Cassini shape parameterization to the dynamical study of actinide fission using the multi-dimensional Langevin equation. The fragment mass distributions for fission of <sup>236</sup>U and <sup>256, 258</sup> Fm are calculated with the 4D Langevin equation. The 4D collective space is formed by adding either α<sub>3</sub> or α<sub>6</sub> to the basic 3D {α, α<sub>1</sub>, α<sub>4</sub>} space. We investigate the role of α<sub>3</sub> and α<sub>6</sub> by comparing the results of 4D (α<sub>3</sub> or α<sub>6</sub>) with that of 3D. For 236U and 256Fm, where asymmetric fission is predominant, the fragment mass distributions calculated in the 4D (α<sub>3</sub>) space are in good agreement with experimental data. On the other hand, for <sup>258</sup>Fm, which is characterized by symmetric fission, 4D (α<sub>6</sub>) is effective for describing the shape of compact symmetric fragments. We demonstrate the advantages of the Cassini shape parameterization for the dynamical study of actinide fission.

    DOI: 10.1051/epjconf/202328404018

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  • Combined analysis of cancer incidence and lifespan in mice exposed to chronic low dose rate radiation Reviewed

    Tetsuhiro Kinugawa, Takahiro Wada, Yuichiro Manabe, Fuminobu Sato, Satoshi Tanaka

    Radiation Protection Dosimetry   Vol. 198 ( 13-15 )   1160 - 1164   2022.9

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/rpd/ncac087

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  • On Radiation-Induced Aging: Accelerated or Premature Aging Reviewed

    Takahiro Wada, Tetsuhiro Kinugawa, Satoshi Tanaka

    Radiation Protection Dosimetry   Vol 198 ( 13-15 )   1155 - 1159   2022.9

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/rpd/ncac086

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  • Possible ternary fission of super-heavy nuclei Reviewed

    Takahiro Wada, Kazuki Okada, Nicolae Carjan, Fedir Ivanyuk

    European Physical Journal EPJ Web of Conference   256 00018   2021

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

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  • Genetic Effects Simulator “WAMSIM” Reviewed

    Yuichi TSUNOYAMA, Yosuke ONOUE, Kazuyo SUZUKI, Yasutaka TAKANISHI, Jo SATO, Yuichiro MANABE, Takahiro WADA, Hiroshi TOKI, Masako BANDO

    Japanese Journal of Health Physics   55 ( 4 )   207 - 214   2020.12

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Health Physics Society  

    DOI: 10.5453/jhps.55.207

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  • Genetic Effects Simulator“ WAMSIM” ―WAM Model Simulator for Predicting Genetic Effects of Low LET Radiation on Plants and Animals― Reviewed

    uichi TSUNOYAMA, Yosuke ONOUE, Kazuyo SUZUKI, Yasutaka TAKANISHI, Jo SATO, Yuichiro MANABE, Takahiro WADA, Hiroshi TOKI, Masako BANDO

    Japanese Journal of Health Physics   55-4   2020.10

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  • The Importance of Mathematical Models for Understanding the Biological Effects of Radiation: Whack-A-Mole Model and Subsequent Developments

    Yuichiro Manabe, Tetsuhiro Kinugawa, Takahiro Wada, Satoshi Tanaka, Yuichi Tsunoyama, Hiroo Nakajima, Hiroshi Toki, Masako Bando

    RADIOISOTOPES   69 ( 7 )   243 - 252   2020.7

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Radioisotope Association  

    DOI: 10.3769/radioisotopes.69.243

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  • Comparison of the LQ and WAM Models on the Fractionation Effect in Radiation Therapy and Animal Experiments Reviewed

    Masako Bando, Yosuke Onoue, Yuichi Tsunoyama, Kazuyo Suzuki, Yasutaka Takanishi, Joe Sato, Yuichiro Manabe, Takahiro Wada, Hiroshi Toki

    Journal of Nuclear Medicine and Radiation Therapy   11-2   2020.6

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  • Relationship between environmental radiation and radioactivity and childhood thyroid cancer Reviewed

    Scientific Reports   10:4074   2020.3

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  • Verification of a dose rate-responsive dynamic equilibrium model on radiation-induced mutation frequencies in mice Reviewed

    Yuichi Tsunoyama, Kazuyo Suzuki, Miwako Masugi-Tokita, Hiroo Nakajima, Yuichiro Manabe, Takahiro Wada, Masako Bando

    International Journal of Radiation Biology   95 ( 10 )   1414 - 1420   2019.10

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1080/09553002.2019.1569772

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  • Incidence of Thyroid Cancer Among Children and Young Adults in Fukushima, Japan Reviewed

    Kazuyo Suzuki, Hiroshi Toki, Takahiro Wada

    JAMA Otolaryngol Head Neck Surgery   145(8):768-769   2019

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  • Study of mutation from DNA to biological evolution Reviewed International journal

    Masako Bando, Tetsuhiro Kinugawa, Yuichiro Manabe, Miwako Masugi, Hiroo Nakajima, Kazuyo Suzuki, Yuichi Tsunoyama, Takahiro Wada, Hiroshi Toki

    International Journal of Radiation Biology   doi: 10.1080/09553002.2019.1606957 ( 10 )   1390 - 1403   2019

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    Language:English   Publishing type:Research paper (scientific journal)  

    Purpose: This is a paper based on a talk given in the BER2018 conference by M. Bando. We first emphasize the importance of collaborations among scientists in various fields for the low dose/dose-rate effects on biological body. We make comparisons of quantitative estimations of mutation caused by the radiation exposure on various animals and plants using one mathematical model. We derive the importance of the spontaneous mutation at the DNA level, which provides the key to understand the biological evolution. We try to make a guide map to solve this problem and find that the mutation is an important stage of the pathway from the DNA damage to the macroscopic biological evolution. Materials and methods: We construct a mathematical model for the mutation, named as 'WAM' model, which takes into account the recovery effect. The model setting is regarded as an extension of the survival and the hazard functions. The WAM model is used to reproduce accumulated data of mutation frequency of animals and plants. Especially the model analysis shows that the dose-rate dependence is important to understand various mutation data. Results and conclusions: The WAM model is successful in reproducing various mutation data of animals and plants. We find that the inclusion of the dose rate is important to understand all the mutation data. Hence, we are able to develop the 'scaling law' to make the cross-species comparison of mutation frequency data. With this finding, we can extract the dominant effect on the mutation to be caused by the spontaneous mutation, and quantify this amount. We are able to write then the artificial radiation frequency by subtracting the spontaneous mutation. With this success, we estimate the origin of the spontaneous mutation as due to ROS, the order of which agrees to the spontaneous mutation.

    DOI: 10.1080/09553002.2019.1606957

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  • 放射線誘発変異発生頻度線量率応答モデル WAM モデルを用いたラッセルのマウス実験結果の再解析 Invited

    角山 雄一, 鈴木 和代, 馬杉美和子, 中島 裕夫, 真鍋勇一郎, 和田 隆宏, 坂東 昌子

    日本放射線安全管理学会誌   17 ( 2 )   138 - 140   2018.11

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    Language:Japanese  

    DOI: 10.11269/jjrsm.17.125

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  • Nuclear Theory for The Synthesis of Superheavy Elements—From The View Point of Fluctuation-dissipation Theory— Reviewed

    Takahiro Wada

    RADIOISOTOPES   67 ( 6 )   255 - 265   2018.6

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Radioisotope Association  

    DOI: 10.3769/radioisotopes.67.255

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  • Angular distribution of scission neutrons studied with time-dependent Schrödinger equation Reviewed

    Takahiro Wada, Tomomasa Asano, Nicolae Carjan

    EPJ Web of Conferences   169   2018.3

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:EDP Sciences  

    DOI: 10.1051/epjconf/201816900029

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  • Time-Dependent Approach to Angular Distribution and Energy of Scission Neutrons Reviewed

    Takahiro Wada, Tomomasa Asano

    Fission and Properties of Neutron-Rich Nuclei   2017.10

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    Authorship:Lead author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:WORLD SCIENTIFIC  

    DOI: 10.1142/9789813229426_0069

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  • Dose and dose-rate dependence of mutation frequency under long-term exposure - a new look at DDREF from WAM model Reviewed

    Takahiro Wada, Yuichiro Manabe, Issei Nakamura, Yuichi Tsunoyama, Hiroo Nakajima, Masako Bando

    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY   53 ( 11 )   1824 - 1830   2016

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1080/00223131.2016.1164635

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  • Mathematical model which can estimate the mutation frequency induced by radiation, considering dose rate explicitly Reviewed

    Yuichiro Manabe, Takahiro Wada, Yuichi Tsunoyama, Hiroo Nakajima, Masako Bando

    GENES & GENETIC SYSTEMS   90 ( 6 )   399 - 399   2015.12

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  • 16pCT-2 WAM model and dose-rate dependence : Time-distribution of radiation dose vs. mutation frequency

    Wada T., Manabe Y., Tsunoyama Y., Nakajima H., Bando M.

    Meeting Abstracts of the Physical Society of Japan   70   2899 - 2899   2015

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    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    DOI: 10.11316/jpsgaiyo.70.2.0_2899

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  • Mathematical model for dose and dose-rate response of the radiation-induced mutation frequency - Application of Whack-A-Model model Reviewed

    Yuichiro Manabe, Takahiro Wada, Issei Nakamura, Yuichi Tsunoyama, Hiroo Nakajima, Masako Bando

    50(3), 211-225   2015

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  • 24aAR-10 Two component theory for quatitative estimation of damage of livin object by radiation exposure

    Meeting Abstracts of the Physical Society of Japan   70   3426 - 3426   2015

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    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    DOI: 10.11316/jpsgaiyo.70.1.0_3426

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  • 16pCT-3 Interplay of Mutation Frequency and Evolution

    Bando M., Manabe Y., Wada T., Tsunoyama Y., Nakajima H.

    Meeting Abstracts of the Physical Society of Japan   70   2900 - 2900   2015

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    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    DOI: 10.11316/jpsgaiyo.70.2.0_2900

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  • 16pCT-1 Explanation for sector form relationship between dose and induced mutation frequency by Whack-A-Mole (WAM) model

    Manabe Yuichiro, Wada Takahiro, Tsunoyama Yuichi, Nakajima Hiroo, Bando Masako

    Meeting Abstracts of the Physical Society of Japan   70   2898 - 2898   2015

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    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    DOI: 10.11316/jpsgaiyo.70.2.0_2898

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  • Effects of the fission fragments on the angular distribution of scission particles Reviewed

    T. Wada, T. Asano, N. Carjan

    SCIENTIFIC WORKSHOP ON NUCLEAR FISSION DYNAMICS AND THE EMISSION OF PROMPT NEUTRONS AND GAMMA RAYS, THEORY-3   64   34 - 39   2015

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    Authorship:Lead author   Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1016/j.phpro.2015.04.005

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  • Whack-A-Mole Model: Towards a Unified Description of Biological Effects Caused by Radiation Exposure Reviewed

    Yuichiro Manabe, Takahiro Wada, Yuichi Tsunoyama, Hiroo Nakajima, Issei Nakamura, Masako Bando

    Journal of the Physical Society of Japan   84, 044002   2015

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  • Effects of Fission Fragments on the Angular Distribution of Scission Neutrons Reviewed

    T. Wada, T. Asano, M. Hirokane, N. Carjan, M. Rizea

    SCIENTIFIC WORKSHOP ON NUCLEAR FISSION DYNAMICS AND THE EMISSION OF PROMPT NEUTRONS AND GAMMA RAYS   47   33 - 38   2013

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    Authorship:Lead author   Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1016/j.phpro.2013.06.006

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  • Angular Distribution of the Scission Neutrons with Respect to the Fission Axis Reviewed

    M. Rizea, N. Carjan, T. Wada

    SCIENTIFIC WORKSHOP ON NUCLEAR FISSION DYNAMICS AND THE EMISSION OF PROMPT NEUTRONS AND GAMMA RAYS   47   27 - 32   2013

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    DOI: 10.1016/j.phpro.2013.06.005

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  • Effect of Uncertainties in Nuclear Reaction Rate on Nucleosynthesis Paths Reviewed

    Kazuyuki Yamamoto, Kiyoshi Kato, Takahiro Wada, Masahisa Ohta

    PROGRESS OF THEORETICAL PHYSICS   123 ( 6 )   1029 - 1039   2010.6

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  • Nuclear fission of Fm isotopes Reviewed

    T. Asano, T. Wada, M. Ohta, S. Chiba

    AIP Conference Proceedings   1238   325 - 327   2010

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    DOI: 10.1063/1.3455960

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  • Radiative capture cross section for 16o(n,γ)17o and 16o(p,γ)17f below astrophysical energies Reviewed

    Kazuyuki Yamamoto, Hiroshi Masui, Kiyoshi Katõ, Takahiro Wada, Masahisa Ohta

    Progress of Theoretical Physics   121 ( 2 )   375 - 390   2009.2

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    DOI: 10.1143/PTP.121.375

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  • A DYNAMICAL CALCULATION OF MULTI-MODAL NUCLEAR FISSION Reviewed

    TAKAHIRO WADA, TOMOMASA ASANO

    Fission and Properties of Neutron-Rich Nuclei   2008.8

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    Authorship:Lead author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:WORLD SCIENTIFIC  

    DOI: 10.1142/9789812833433_0026

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  • Neutron capture reaction in oxygen nuclei near threshold energy regions Reviewed

    K. Yamamoto, H. Masui, K. Kato, T. Wada, M. Ohta

    AIP Conference Proceedings   1016   227 - 232   2008

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:American Institute of Physics Inc.  

    DOI: 10.1063/1.2943578

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  • Systematic Study for the Shell Effect in the Fission Fragment Mass Distribution Ruptured from Neutron Rich Nuclei Reviewed

    WADA Takahiro

    Nuclear Physics A,   Vol.805, pp.558 - 560   2008

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  • The r-process element abundance with a realistic fission fragment mass distribution Reviewed

    S. Chiba, H. Koura, T. Maruyama, M. Ohta, S. Tatsuda, T. Wada, T. Tachibana, K. Sumiyoshi, K. Otsuki, T. Kajino

    ORIGIN OF MATTER AND EVOLUTION OF GALAXIES   1016   162 - +   2008

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  • Systematic study for the mass distribution of fission fragments in the neutron rich region Reviewed

    M. Ohta, S. Tatsuda, T. Hashizume, K. Yamamoto, T. Wada, K. Sumiyoshi, K. Otsuki, T. Kajino, H. Koura, S. Chiba, T. Tachibana

    INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY, VOL 1, PROCEEDINGS   359 - +   2008

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    Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1051/ndata:07302

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  • Fission modes of neutron-rich nuclei in the r-process nucleosynthesis Reviewed

    S. Tatsuda, K. Yamamoto, T. Asano, M. Ohta, T. Wada, S. Chiba, H. Koura, T. Maruyama, T. Tachibana, T. Kajino, K. Sumiyoshi, K. Otsuki

    ORIGIN OF MATTER AND EVOLUTION OF GALAXIES   1016   469 - +   2008

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  • Astrophysical Sites for the Main and Weak r-process Reviewed

    WADA Takahiro

    Nuclear Physics A,   Vol.805, pp.573 - 575   2008

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  • 恒星における元素合成と関係する天体核反応データの問題点(クラスター模型による、共鳴、反応の理論、天体核反応への応用,原子核クラスター物理の現状と展望,研究会報告)

    山本 一幸, 和田 隆宏, 太田 雅久, 西村 高徳, 藤本 正行, 加藤 幾芳, 合川 正幸, 須田 拓馬

    素粒子論研究   115 ( 4 )   D29 - D31   2007

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    Language:Japanese   Publisher:素粒子論グループ 素粒子論研究 編集部  

    DOI: 10.24532/soken.115.4_D29

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  • The importance and the sensitivity of the reaction 17O(n γ)18O in the s-process nucleosynthesis Reviewed

    K. Yamamoto, T. Wada, M. Ohta, T. Nishimura, M. Y. Fujimoto, K. Kato, T. Suda, M. Aikawa

    AIP Conference Proceedings   891   405 - 408   2007

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    DOI: 10.1063/1.2713544

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  • Langevin equation as a stochastic differential equation in nuclear physics Reviewed

    T. Asano, T. Wada, M. Ohta, N. Takigawa

    AIP Conference Proceedings   891   435 - 438   2007

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    DOI: 10.1063/1.2713551

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  • Fission barriers for neutron-rich nuclei by means of Skyrme-Hartree-Fock- Bogoliubov calculation Reviewed

    K. Hashizume, T. Wada, M. Ohta, M. Samyn, S. Goriely

    AIP Conference Proceedings   891   439 - 442   2007

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    DOI: 10.1063/1.2713552

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  • Fission fragment mass distribution for nuclei in the r-process region Reviewed

    S. Tatsuda, K. Hashizume, T. Wada, M. Ohta, K. Sumiyoshi, K. Otsuki, T. Kajino, H. Koura, S. Chiba, Y. Aritomo

    AIP Conference Proceedings   891   423 - 426   2007

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    DOI: 10.1063/1.2713548

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  • A reassessment of surface friction model for maximum cold fusion reactions in superheavy mass region Reviewed

    A. Fukushima, A. Nasirov, Y. Aritomo, T. Wada, M. Ohta

    AIP Conference Proceedings   891   443 - 446   2007

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    DOI: 10.1063/1.2713553

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  • Role of the nuclear shell structure and orientation angles of deformed reactants in complete fusion Reviewed

    AK Nasirov, Y Aritomo, A Fukushima, M Ohta, T Wada, G Giardina, G Mandaglio, A Muminov, RK Utamuratov

    INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS   15 ( 2 )   311 - 317   2006.3

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  • The Dependency on the Dissipation Tensor of Multi-modal Nuclear Fission

    T. Asano, T. Wada, M. Ohta, S. Yamaji, H. Nakahara

    Journal of Nuclear and Radiochemical Sciences   7 ( 1 )   7 - 11   2006

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Nuclear and Radiochemical Sciences  

    DOI: 10.14494/jnrs2000.7.7

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  • 23aSC-9 Fission fragment mass distributions in the r-process region Reviewed

    Tatsuta S., Yamamoto K., Wada T., Ohta M., Sumiyoshi K., Otsuki K., Kajino T., Koura H., Chiba S.

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   24 - 24   2006

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.61.2.1.0_24_2

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  • 29pWF-2 An improved dynamical approach to fusion processes with the multi-dimensional Langevin equations Reviewed

    Fukushima A., Wada T., Ohta M., Nasirov A., Aritomo Y.

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   41 - 41   2006

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.61.1.1.0_41_4

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  • 23aSC-10 Initial conditions for the analysis of heavy-ion fusion reactions with the multi-dimensional Langevin equations Reviewed

    Fukushima A., Wada T., Ohta M., Nasirov A., Aritomo Y.

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   24 - 24   2006

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.61.2.1.0_24_3

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  • 23aSC-8 Fission fragment mass distributions in the r-process region II Reviewed

    Samyn M., Goriely S.

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   24 - 24   2006

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.61.2.1.0_24_1

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  • Study on the dominant reaction path in nucleosynthesis during stellar evolution by means of the Monte Carlo method Reviewed

    K. Yamamoto, K. Hashizume, T. Wada, M. Ohta, T. Nishimura, M. Y. Fujimoto, K. Kato, T. Suda, M. Aikawa

    ORIGIN OF MATTER AND EVOLUTION OF GALAXIES   847   497 - +   2006

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    DOI: 10.1063/1.2234471

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  • Multi-modal nuclear fission in the actinide nuclei

    T. Asano, T. Wada, M. Ohta, T. Ichikawa, S. Yamaji, H. Nakahara

    AIP Conference Proceedings   704   111 - 119   2004.4

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    DOI: 10.1063/1.1737102

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  • On the excitation energy for maximum cold fusion reactions in superheavy mass region

    A Fukushima, T Wada, M Ohta, Y Aritomo

    TOURS SYMPOSIUM ON NUCLEAR PHYSICS V   704   557 - 562   2004

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    DOI: 10.1063/1.1737155

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  • Dynamical calculation of multi-modal nuclear fission of fermium isotopes Reviewed

    T Asano, T Wada, M Ohta, T Ichikawa, S Yamaji, H Nakahara

    PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT   Vol.154, pp.457-464 ( 154 )   457 - 464   2004

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    DOI: 10.1143/ptps.154.457

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  • Dynamics of Fission Modes Studied with the 3-dimensional Langevin Equation Reviewed

    T. Ichikawa, T. Asano, T. Wada, M. Ohta

    Journal of Nuclear and Radiochemical Sciences   3 ( 1 )   67 - 69   2002

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    DOI: 10.14494/jnrs2000.3.67

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  • 24aXC-9 超重元素合成断面積の解析と予測 Reviewed

    太田 雅久, 有友 嘉浩, 福島 賛, 橋詰 和明, 和田 隆宏

    日本物理学会講演概要集   57 ( 0 )   22 - 22   2002

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    DOI: 10.11316/jpsgaiyo.57.1.1.0_22_2

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  • Fission width of compound nuclei calculated using the mean first passage time method Reviewed

    T Ichikawa, T Wada, M Ohta

    PROGRESS OF THEORETICAL PHYSICS   105 ( 6 )   915 - 922   2001.6

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  • Reaction theory for the synthesis of superheavy elements Reviewed

    T Wada, Y Aritomo, T Ichikawa, M Ohta, Y Abe

    4TH SYMPOSIUM ON NUCLEAR PHYSICS   561   411 - 420   2001

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  • Systematic trend on the synthesis of superheavy elements(I) Reviewed

    Ohta M., Aritomo Y., Wada T., Ichikawa T.

    Meeting Abstracts of the Physical Society of Japan   56 ( 0 )   22 - 22   2001

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    DOI: 10.11316/jpsgaiyo.56.1.1.0_22_2

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  • Diffusion over a saddle with a Langevin equation Reviewed

    Y Abe, D Boilley, BG Giraud, T Wada

    PHYSICAL REVIEW E   61 ( 2 )   1125 - 1133   2000.2

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  • Theoretical predictions of residues cross sections of superheavy elements Reviewed

    Y Abe, K Okazaki, Y Aritomo, T Tokuda, T Wada, M Ohta

    NUCLEAR SHELLS - 50 YEARS   240 - 243   2000

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  • Dynamics of the synthesis of superheavy elements Reviewed

    T Wada

    PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT   Vol.140, pp.1-10 ( 140 )   1 - 10   2000

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  • Recent status of reaction theories for synthesis of superheavy elements Reviewed

    Y Abe, K Okazaki, T Wada, M Ohta, Y Aritomo

    INTERNATIONAL SYMPOSIUM ON QUASIPARTICLE AND PHONON EXCITATIONS IN NUCLEI (SOLOVIEV 99)   1 - 9   2000

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  • Theory of nuclear reactions leading to superheavy elements Reviewed

    Y Abe, K Okazaki, Y Aritomo, T Wada, M Ohta

    PROCEEDINGS OF THE 7TH INTERNATIONAL CONFERENCE ON CLUSTERING ASPECTS OF NUCLEAR STRUCTURE AND DYNAMICS   394 - 401   2000

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  • Fusion-fission dynamics for synthesis of superheavy elements Reviewed

    Y Aritomo, K Okazaki, T Wada, M Ohta, Y Abe

    NUCLEAR SHELLS - 50 YEARS   276 - 285   2000

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  • Multi-dimensional fluctuation-dissipation dynamics of the synthesis of superheavy elements Reviewed

    T. Wada, Y. Aritomo, T. Tokuda, K. Okazaki, M. Ohta, Y. Abe

    NUCLEAR PHYSICS A   654 ( 1 )   888C - 891C   1999.7

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  • Fusion cross section of massive nuclei by fluctuation-dissipation dynamics Reviewed

    T Tokuda, T Wada, M Ohta

    PROGRESS OF THEORETICAL PHYSICS   101 ( 3 )   607 - 613   1999.3

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  • Fluctuation-dissipation model for synthesis of superheavy elements Reviewed

    Y Aritomo, T Wada, M Ohta, Y Abe

    PHYSICAL REVIEW C   59 ( 2 )   796 - 809   1999.2

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  • 質量非対称融合反応による超重核合成(原子核動力学における散逸と減衰,研究会報告) Reviewed

    岡崎 謙一郎, 徳田 卓也, 有友 嘉浩, 和田 隆宏, 太田 雅久, 阿部 恭久

    素粒子論研究   99 ( 3 )   C60 - C65   1999

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    超重核を合成する融合・分裂反応の動的な過程は、揺動散逸動力学で記述される。異なる入射チャネルからの融合反応を調べるために変形自由度に質量非対称度を加えた多次元ランジュバン方程式を数値的に解く。入射時での質量非対称度が大きくなると、fusion hindranceが緩和され融合しやすくなるが、同時に合成系の励起エネルギーが高くなるため、分裂もしやすくなる。いくつかの異なる入射チャネルからの質量非対称融合・分裂反応について蒸発残留核断面積の計算を行い、超重核合成のための入射核、標的核の最適化について述べる。

    DOI: 10.24532/soken.99.3_C60

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  • 29p-YF-12 The Estimation for the Evaporation Residue Cross Section of Fusion Reactions <48>^Ca^+<238>^U etc.with Dissipation-Fluctuation Dynamics Reviewed

    Okazaki K., Tokuda T., Aritomo Y., Wada T., Ohta M., Abe Y.

    Meeting Abstracts of the Physical Society of Japan   54 ( 0 )   32 - 32   1999

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    DOI: 10.11316/jpsgaiyo.54.1.1.0_32_3

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  • Favorable combination for the synthesis of superheavy elements Reviewed

    M Ohta, K Okazaki, T Wada, Y Aritomo, Y Abe

    ACTA PHYSICA HUNGARICA NEW SERIES-HEAVY ION PHYSICS   10 ( 2-3 )   253 - 264   1999

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  • Angular momentum dependence of the prescission time of medium mass hot nuclei Reviewed

    K Yuasa-Nakagawa, T Nakagawa, K Furutaka, K Matsuda, Y Futami, K Yoshida, J Kasagi, SM Lee, T Suomijarvi, WQ Shen, T Wada, S Yamaji, Y Abe

    PHYSICS LETTERS B   420 ( 1-2 )   25 - 30   1998.2

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  • Diffusion model for the synthesis of superheavy elements Reviewed

    Y Aritomo, K Okazaki, T Wada, M Ohta, Y Abe

    TOURS SYMPOSIUM ON NUCLEAR PHYSICS III   ( 425 )   61 - 71   1998

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  • The Evaporation Residue Cross Section in Super Heavy Mass Region with Mass Asymmetry Reviewed

    OKAZAKI K., TOKUDA T., ARITOMO Y., WADA T., OHTA M., ABE Y.

    Meeting Abstracts of the Physical Society of Japan   53 ( 0 )   32 - 32   1998

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    DOI: 10.11316/jpsgaiyo.53.2.1.0_32_4

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  • Angular momentum dependence of prescission particle multiplicity in medium mass systems Reviewed

    K Yuasa-Nakagawa, T Nakagawa, K Yoshida, K Furutaka, K Matsuda, Y Futami, Liu, X, Y Aoki, SM Lee, J Kasagi, DX Jiang, T Suomijarvi, WQ Shen, T Wada, S Yamaji, Y Abe

    TOURS SYMPOSIUM ON NUCLEAR PHYSICS III   ( 425 )   142 - 151   1998

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    DOI: 10.1063/1.55138

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  • Multi-dimensional diffusion model for the synthesis of superheavy elements Reviewed

    T Wada, Y Aritomo, T Tokuda, K Okazaki, M Ohta, Y Abe

    PROCEEDINGS OF THE XVII RCNP INTERNATIONAL SYMPOSIUM ON INNOVATIVE COMPUTATIONAL METHODS IN NUCLEAR MANY-BODY PROBLEMS   461 - 469   1998

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  • Simulation for fusion and fusion-fission dynamics in heavy nuclei Reviewed

    K Okazaki, K Hatogai, Y Aritomo, T Tokuda, T Wada, M Ohta, Y Abe

    TOURS SYMPOSIUM ON NUCLEAR PHYSICS III   ( 425 )   107 - 110   1998

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  • On the Synthesis of Super Heavy Element by Asymmetry Fusion Reaction Reviewed

    OKAZAKI K., TOKUDA T., ARITOMO Y., WADA T., OHTA M., ABE Y.

    Meeting Abstracts of the Physical Society of Japan   53 ( 0 )   40 - 40   1998

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    DOI: 10.11316/jpsgaiyo.53.1.1.0_40_4

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  • A new mechanism for synthesis of superheavy elements Reviewed

    Y Abe, Y Aritomo, T Wada, M Ohta

    JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS   23 ( 10 )   1275 - 1284   1997.10

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  • Dynamics of the superheavy element synthesis with a diffusion model Reviewed

    T Wada, Y Aritomo, T Tokuda, M Ohta, Y Abe

    NUCLEAR PHYSICS A   616 ( 1-2 )   C446 - C453   1997.4

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  • Diffusion mechanism for synthesis of superheavy elements Reviewed

    Y Aritomo, T Wada, M Ohta, Y Abe

    PHYSICAL REVIEW C   55 ( 3 )   R1011 - R1014   1997.3

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  • 28p-YM-4 Estimation of Evaporation Residue Cross Section of Superheavy Elements by 2-dimensional Diffusion Model Reviewed

    Aritomo Y., Wada T., Ohta M., Abe Y.

    Meeting Abstracts of the Physical Society of Japan   52 ( 0 )   40 - 40   1997

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    DOI: 10.11316/jpsgaiyo.52.1.1.0_40_3

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  • 23p-A-3 Estimation of Evaporation Residue Cross Section of Superheavy Elements by multi-dimensional Diffusion Model Reviewed

    Aritomo Y., Okazaki K., Wada T., Ohta M., Abe Y.

    Meeting Abstracts of the Physical Society of Japan   52 ( 0 )   50 - 50   1997

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    DOI: 10.11316/jpsgaiyo.52.2.1.0_50_1

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  • 23p-A-1 Relaxation of Collective Degrees of Freedom in Heavy Nuclear Fusion Reaction Reviewed

    Okazaki K., Tokuda T., Aritomo Y., Wada T., Ohta M., Abe Y.

    Meeting Abstracts of the Physical Society of Japan   52 ( 0 )   49 - 49   1997

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    DOI: 10.11316/jpsgaiyo.52.2.1.0_49_3

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  • Diffusion mechanism for synthesis of superheavy elements Reviewed

    Y. Aritomo, T. Wada, M. Ohta, Y. Abe

    Physical Review C - Nuclear Physics   55 ( 3 )   R1011 - R1014   1997

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    DOI: 10.1103/PhysRevC.55.R1011

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  • 6a-F-3 Cooling Property of Excited Nuclei in Superheavy Mass Region Reviewed

    Tokuda T., Aritomo Y., Wada T., Ohta M.

    Meeting Abstracts of the Physical Society of Japan   1996 ( 0 )   56 - 56   1996

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    DOI: 10.11316/jpsgaiyoj.1996.1.0_56_2

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  • 6a-F-4 Systematics of Evaporation Residue Cross Section of Superheavy Elements by Diffusion Model Reviewed

    Aritomo Y., Wada T., Ohta M., Abe Y.

    Meeting Abstracts of the Physical Society of Japan   1996 ( 0 )   57 - 57   1996

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    DOI: 10.11316/jpsgaiyoj.1996.1.0_57_1

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  • On the Statistical and Dynamical Aspects of Nuclear Fission Reviewed

    WADA Takahiro

    Memoirs of Konan University, Science Series   Vol.42, pp.45-52   1995

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  • 30p-SB-10 Estimation of Evaporation Residue Cross Section of Superheavy Elements by Diffusion Model Reviewed

    Aritomo Y., Wada T., Ohta M., Abe Y.

    Meeting Abstracts of the Physical Society of Japan   1995 ( 0 )   88 - 88   1995

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    DOI: 10.11316/jpsgaiyoj.1995.1.0_88_1

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  • Energy dependence of a local equivalent potential for RGM phase shifts for 16O + 16O Reviewed

    S. Ait-Tahar, R.S. Mackintosh, S.G. Cooper, T. Wada

    Nuclear Physics A   562 ( 1 )   101 - 110   1993.9

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    DOI: 10.1016/0375-9474(93)90034-u

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  • One-body dissipation in agreement with prescission neutrons and fragment kinetic energies Reviewed

    Takahiro Wada, Yasuhisa Abe, Nicolae Carjan

    Physical Review Letters   70 ( 23 )   3538 - 3541   1993.6

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    DOI: 10.1103/physrevlett.70.3538

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevLett.70.3538/fulltext

  • Multi-dimensional Langevin approach to fission dynamics Reviewed

    Takahiro Wada, Nicolae Carjan, Yasuhisa Abe

    Nuclear Physics, Section A   538 ( C )   283 - 289   1992

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    DOI: 10.1016/0375-9474(92)90778-I

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  • Nucleon momentum distribution in colliding nuclei and potential between excited nuclei studied with the Vlasov equation Reviewed

    A. Ohnishi, H. Horiuchi, T. Wada

    Physical Review C   41 ( 5 )   2147 - 2158   1990.5

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    DOI: 10.1103/physrevc.41.2147

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  • Strength of the attraction of the Skyrme-type forces used in the heavy-ion reaction problems Reviewed

    Takahiro Wada, Shinichiro Yamaguchi, Hisashi Horiuchi

    Physical Review C   41 ( 1 )   160 - 168   1990.1

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    DOI: 10.1103/physrevc.41.160

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevC.41.160/fulltext

  • Resonating-Group-Method study of alpha+40Ca elastic scattering and 44Ti structure Reviewed

    T. Wada, H. Horiuchi

    Physical Review C   38 ( 5 )   2063 - 2077   1988.11

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    DOI: 10.1103/physrevc.38.2063

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  • Study of 16O-16O Potntial by the Resonating Group Method. II: Analyses of Constituent Components of the Exchange Potential between Heavy-Ion Nuclei Reviewed

    T. Wada, H. Horiuchi

    Progress of Theoretical Physics   80 ( 3 )   502 - 516   1988.9

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    DOI: 10.1143/ptp.80.502

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  • Study of 16O-16O Potential by the Resonating Group Method. I Reviewed

    T. Wada, H. Horiuchi

    Progress of Theoretical Physics   80 ( 3 )   488 - 501   1988.9

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    DOI: 10.1143/ptp.80.488

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  • Microscopic Derivation of the Nucleus-Nucleus Potential by the Use of the Density-Dependent Effective Interaction Reviewed

    K. Yabana, T. Wada, H. Horiuchi

    Progress of Theoretical Physics   79 ( 1 )   19 - 23   1988.1

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    DOI: 10.1143/ptp.79.19

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  • Comparison of the Microscopic Potential with the Optical Potential in the Alpha + 16O System Reviewed

    T. Wada, H. Horiuchi

    Physical Review Letters   58 ( 21 )   2190 - 2193   1987.5

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    DOI: 10.1103/physrevlett.58.2190

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevLett.58.2190/fulltext

  • Cranked Cluster Wave Function for Molecular States Reviewed

    H. Horiuchi, T. Wada, K. Yabana

    Progress of Theoretical Physics   76 ( 4 )   837 - 860   1986.10

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    DOI: 10.1143/ptp.76.837

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  • Microscopic Derivation of the Spin-Orbit Potential of Mass-Three Nucleus Reviewed

    T. Wada, Y. Takahashi, H. Horiuchi

    Progress of Theoretical Physics   75 ( 3 )   619 - 638   1986.3

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    DOI: 10.1143/ptp.75.619

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  • Effect of Coulomb Force on the Volume Integral of Light-Ion Nuclear Potential Reviewed

    T. Wada, H. Horiuchi

    Progress of Theoretical Physics   75 ( 3 )   754 - 756   1986.3

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    DOI: 10.1143/ptp.75.754

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  • Study of 16O+40Ca Potential by the Resonating Group Method Reviewed

    T. Wada

    Progress of Theoretical Physics   75 ( 2 )   458 - 460   1986.2

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    DOI: 10.1143/ptp.75.458

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  • Study of the Difference between the Spin-Orbit Potentials of 3He and t by the Resonating Group Method Reviewed

    T. Wada

    Progress of Theoretical Physics   75 ( 1 )   198 - 200   1986.1

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    DOI: 10.1143/ptp.75.198

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  • Comparison of the Spin-Orbit Potential of Proton with the Potential of Triton Reviewed

    Takahiro Wada

    Journal of the Physical Society of Japan   Vol.55, Suppl., pp.738-739   1985

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  • Microscopic Study of Inter-Nucleus Potential on the Basis of the Resonating Group Method Reviewed

    Takahiro Wada

    Journal of the Physical Society of Japan   Vol.54, Suppl. II, pp.53-62   1985

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  • WKB Treatment of Boson Hamiltonian of Inter-Nucleus Interaction Reviewed

    H. Horiuchi, K. Aoki, T. Wada, K. Yabana

    Progress of Theoretical Physics   70 ( 6 )   1599 - 1623   1983.12

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    DOI: 10.1143/ptp.70.1599

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▼display all

Books

  • 新型コロナで世の中がエラいことになったので関西大学がいろいろ考えた。

    和田 隆宏, 高鳥毛 敏雄, 山崎 栄一, 元吉 忠寛, 近藤 誠司, 永田 尚三, 土田 昭司, 矢田 勝俊, 越山 健治, 菅原 慎悦, 小井川 広志, 地主 敏樹, 西本 昌弘, 菊池 信彦

    浪速社  2021.4 

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    第4章「感染予測」を武器にする 数理モデルで新型コロナウイルスを探ってみた 体内でのウイルス増殖や人から人への感染拡大をメカニズムに基づいた数理モデルで記述し、データをフィットして得られるパラメータから、新型コロナウイルスの特徴やそれへの対処法を探求する。

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  • Theory of synthesis of super-heavy elements - From a view point of fluctuation-dissipation dynamics - Reviewed

    WADA Takahiro( Role: Sole author)

    Radioisotopes  2018 

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  • Challenge to synthesis of superheavy elements Reviewed

    WADA Takahiro( Role: Sole author)

    2018 

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  • Physics of the Search for Superheavy Elements Reviewed

    WADA Takahiro( Role: Joint author)

    Journal of Physical Society of Japan  2002 

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MISC

  • 核分裂研究のためのランジュバン計算の4次元化(2)4次元ランジュバン核分裂計算のための微視的ポテンシャル

    浅野大雅, 和田隆宏, 有友嘉浩, 太田雅久

    日本原子力学会春の年会予稿集(CD-ROM)   2016   2016

  • 核分裂研究のためのランジュバン計算の4次元化(1)ランジュバン方程式を用いた核分裂計算

    和田隆宏, 浅野大雅, 有友嘉浩, 太田雅久

    日本原子力学会春の年会予稿集(CD-ROM)   2016   2016

  • 核分裂研究のためのランジュバン計算の4次元化(3)液滴ポテンシャルを用いた4次元ランジュバン核分裂計算

    有友嘉浩, 浅野大雅, 和田隆宏, 太田雅久

    日本原子力学会春の年会予稿集(CD-ROM)   2016   2016

  • 27aHB-6 Study of angular distribution of scission neutrons with time-dependent Schroedinger equation

    Wada T., Asano T., Hirokane M., Carjan N., Rizea M.

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   54 - 54   2013.3

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  • 27aHB-7 Nonreflecting boundary condition for time-dependent Schrodinger equation

    Hirokane M., Asano T., Wada T.

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   54 - 54   2013.3

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  • 12pSE-5 Multi-dimensional calculation of U nucleus fission

    Asano Tomomasa, Wada T., Ohta M.

    Meeting abstracts of the Physical Society of Japan   65 ( 2 )   40 - 40   2010.8

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  • 28aXF-10 4-dimensional dynamical calculation for nuclear fusion of super-heavy element

    Asano Tomomasa, Wada T., Ohta M.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   46 - 46   2009.3

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  • 23pSB-6 Analysis for ^<17>O(n,γ), ^<18>O(γ,n) reaction in near threshold energy

    Yamamoto K., Masui H., Kato K., Wada T., Ohta M.

    Meeting abstracts of the Physical Society of Japan   63 ( 2 )   47 - 47   2008.8

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  • 23aSA-12 Langevin equation as stochastic differential equation for nuclear fusion

    Asano Tomomasa, Wada T., Ohta M., Takigawa N.

    Meeting abstracts of the Physical Society of Japan   63 ( 2 )   45 - 45   2008.8

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  • 24aYE-3 The role of fission process in the r-process nucleosynthesis

    Tatsuda S., Ohta M., Wada T., Chiba S., Koura H., Maruyama T., Tachibana T., Kajino T., Sumiyoshi K., Ohtsuki K.

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   53 - 53   2007.8

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  • 24aYE-2 Impact of fission fragment mass distribution on r-process nucleosynthesis

    Chiba S., Koura H., Maruyama T., Ohta M., Tatsuda S., Wada T., Tachibana T., Kajino T., Sumiyoshi K., Otsuki K.

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   53 - 53   2007.8

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  • 24aYE-4 The neutron capture reaction for the oxygen isotopes in the s-process nucleosynthesis

    Yamamoto K., Wada T., Masui H., Kato K., Ohta M.

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   53 - 53   2007.8

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  • 28pSB-11 The importance and the sensitivity of the reaction ^<17>O(n,γ)^<18>0 in the s-process nucleosynthesis II

    Yamamoto K., Wada T., Ohta M., Kato K., Masui H.

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   53 - 53   2007.2

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  • 20pSE-9 The importance and the sensitivity of the reaction ^<17>O(n,γ)^<18>O in the s-process nucleosynthesis

    Yamamoto K., Wada T., Ohta M., Nishimura T., Fujimoto M.Y., Kato K., Aikawa M., Suda T.

    Meeting abstracts of the Physical Society of Japan   61 ( 2 )   9 - 9   2006.8

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  • 23aSC-11 Langevin equation as a stochastic differential equation in nuclear physics

    Asano Tomomasa, Wada Takahiro, Ohta Masahisa, Takigawa Noboru

    Meeting abstracts of the Physical Society of Japan   61 ( 2 )   24 - 24   2006.8

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  • 27pWF-1 Systematic analysis of fission barriers in r-process region

    Hashizume K., Bansyo Y., Yoshioka K., Wada T., Ohta M., Samyn Mathieu, Goriely Stephane

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   34 - 34   2006.3

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  • 27pWF-3 The Monte Carlo method for the dominant paths in stellar nucleosynthsis

    Yamamoto K., Hashizume K., Wada T., Ohta M., Nishimura T., Suda T., Fujimoto M.Y., Kato K., Aikawa M.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   34 - 34   2006.3

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  • 27pWF-2 Fission fragment mass distributions in the r-process region

    Tatsuta S., Yamamoto K., Wada T., Ohta M., Sumiyoshi K., Otsuki K., Kajino T., Koura H., Chiba S.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   34 - 34   2006.3

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  • 28pSG-15 超重核領域の重イオン融合反応における融合確率分布(核構造・多体基礎論/核反応/超重核, 理論核物理)

    福島 賛, 和田 隆宏, 太田 雅久

    日本物理学会講演概要集   59 ( 2 )   34 - 34   2004.8

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  • Dynamical Calculation of Multi-Modal Nuclear Fission of Fermium Nuclei

    ASANO T., WADA T., OHTA M., ICHIKAWA T., YAMAJI S., NAKAHARA H.

    Journal of Nuclear and Radiochemical Sciences   5 ( 1 )   1 - 5   2004

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    Multi-modal nuclear fission of fermium isotopes at low excitation energy is dynamically investigated. The multidimensional Langevin equation is used for the dynamical calculation. We use the potential energy taking account of the microscopic energy which depends on the excitation energy. We calculate the mass and the total kinetic energy (TKE) distributions of the fission fragments for <SUP>264</SUP>Fm. The deformation of the fission fragments at the scission plays an important role in classifying the nuclear fission modes. We show that there exist following three types for the scission configuration classified by the shape of the fission fragments: mass-symmetric compact configuration, mass-asymmetric configuration, and mass-symmetric elongated configuration. We calculate the average mass number and the average TKE for each configuration. We also study the isotope dependence of the mass distribution of the fission fragments from three fermium isotopes.

    DOI: 10.14494/jnrs2000.5.1

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  • Dynamical calculation of multi-modal Fission modes on the Fermium Isotopes

    Asano Tomomasa, Ichikawa Takatoshi, Wada Takahiro, Ohta Masahisa, Yamaji Shuhei, Nakahara Hiromichi

    Meeting abstracts of the Physical Society of Japan   58 ( 1 )   49 - 49   2003.3

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  • Physics of the Search for Superheavy Elements

    WADA Takahiro, ABE Yasuhisa

    57 ( 6 )   383 - 390   2002.6

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    More than 30 years have been passed since the prediction was made for the existence of the superheavy elements (SHE). It is now reported that SHE are synthesized in the laboratories. In this manuscript, we explain what SHE are and then, by looking back history, we discuss the purpose and the interest of the search for SHE. The present status of the experiments of synthesizing SHE is reviewed. We also discuss our theoretical study of the reaction process and present the prediction of the evaporation residue cross section of SHE via heavy-ion fusion reaction. Future perspectives are also given.

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  • 24aXC-12 3次元ランジュバン方程式による^<249>Bkの核分裂モードの計算

    市川 隆敏, 浅野 大雅, 和田 隆宏, 太田 雅久

    日本物理学会講演概要集   57 ( 1 )   23 - 23   2002.3

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  • 24aXC-11 多モード核分裂の動力学計算

    浅野 大雅, 市川 隆敏, 和田 隆宏, 太田 雅久

    日本物理学会講演概要集   57 ( 1 )   22 - 22   2002.3

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  • Evaporation Residue Cross Section with Low Fission Barrier

    Ichikawa T., Wada T., Ohta M., Abe Y.

    Meeting abstracts of the Physical Society of Japan   55 ( 1 )   22 - 22   2000.3

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  • Multi-Dimensional Langevin Approach to Fusion of Massive Nuclei

    Soryushiron Kenkyu   99 ( 3 )   C66 - C67   1999.6

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  • DIFFUSION MODEL FOR SYNTHESIS OF SUPERHEAVY ELEMENTS

    Aritomo Y., Kosenko G.I., Oganessian Yu.Ts., Okazaki K., Wada T., Ohta M., Abe Y.

    Soryushiron Kenkyu   99 ( 3 )   C68   1999.6

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  • 揺動散逸動力学による<sup>48</sup>Ca+<sup>238</sup>U融合反応等の蒸発残留核断面積の評価

    岡崎謙一郎, 徳田卓也, 和田隆宏, 有友嘉浩, 太田雅久, 阿部恭久

    日本物理学会講演概要集   54 ( 1 )   1999

  • Fusion Reaction of Massive Nuclei by Fluctuation-Dissipation Dynamics

    TOKUDA T., OKAZAKI K., WADA T., OHTA M., ABE Y.

    Meeting abstracts of the Physical Society of Japan   53 ( 2 )   32 - 32   1998.9

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  • Electronic Shell Effect on Fission Barriers of Metallic Clusters

    HAMADA Kenmei, WADA Takahiro, OHTA Masahisa

    Meeting abstracts of the Physical Society of Japan   53 ( 1 )   327 - 327   1998.3

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  • 23p-A-2 Study of Fusion Reactions of Massive Nuclei by Multidimensional Langevin Equation

    Tokuda T., Okazaki K., Wada T., Ohta M., Abe Y.

    Meeting abstracts of the Physical Society of Japan   52 ( 2 )   49 - 49   1997.9

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  • 28p-YM-5 Study of Heavy-Ion Fusion Reactions by Multidimensional Langevin Equation

    Tokuda T., Okazaki K., Wada T., Ohta M., Abe Y.

    Meeting abstracts of the Physical Society of Japan   52 ( 1 )   40 - 40   1997.3

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  • クラスター崩壊の統計模型(原子核とマイクロクラスターの類似性と異質性,研究会報告)

    太田 雅久, 和田 隆宏, 阿部 恭久

    素粒子論研究   92 ( 5 )   E80 - E83   1996.2

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  • クラスター崩壊の統計模型(原子核とマイクロクラスターの類似性と異質性,研究会報告)

    太田 雅久, 和田 隆宏, 阿部 恭久

    物性研究   65 ( 6 )   898 - 901   1996

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    Other Link: http://dl.ndl.go.jp/info:ndljp/pid/10938027

  • Nuclear Dissipative Dynamics

    Soryushiron Kenkyu   90 ( 1 )   A52   1994.10

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  • 30p-F-5 Dissipative dynamics of fission of highly excited nuclei

    Wada T, Abe Y

    Abstracts of the meeting of the Physical Society of Japan. Sectional meeting   1994 ( 1 )   75 - 75   1994.9

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  • 多次元ランジュバン方程式による誘起核分裂の研究(低および中高エネルギー重イオン核反応機構,研究会報告)

    和田 隆宏, 阿部 恭久, Carjan N.

    素粒子論研究   83 ( 5 )   E17 - E21   1991.8

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  • High energy gamma ray production in heavy ion collisions

    Ohnishi A., Wada T., Horiuchi H.

    45 ( 1 )   30 - 30   1990.3

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  • DECAY DYNAMICS OF HOT NUCLEI

    Y ABE, N CARJAN, M OHTA, T WADA

    SECOND IN2P3-RIKEN SYMPOSIUM ON HEAVY-ION COLLISIONS   169 - 185   1990

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  • 29p-X-5 VUU approach to the Momentum Distribution in Heavy Ion Collisions

    Ohnishi A., Mada T., Horiuchi H.

    44 ( 1 )   42 - 42   1989.3

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Presentations

  • Proposal of WAM model -Is LNT suitable to describe low-dose/dose rate biological effects caused by radiation?

    Masako Bando, Takahiro Wada, Yuichiro Manabe, Yuichi Tsunoyama

    2018 

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    Venue:Pasco, WA, USA  

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  • Analysis of childhood thyroid cancer incidence in Fukushima based on dose response relationship

    Takahiro Wada, Hiroshi Toki, Yuichiro Manabe, Toshihiro Higuchi, Masako Bando

    2018 

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    Event date: 2018

    Venue:Osaka, Japan  

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  • Two step model for the occurrence of retinoblastoma

    Tetsuhiro Kinugawa, Takahiro Wada, Yuichiro Manabe

    2018 

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    Venue:Osaka, Japan  

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  • The influence of low dose-rate radiation on the mutation frequency in Drosophila

    Tomonori Ohnishi, Takahiro Wada, Yuichiro Manabe, Masako Bando

    2018 

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    Venue:Osaka, Japan  

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  • WAM model -a dynamic equilibrium model for the dose-rate effect

    Yuichi Tsunoyama, Kazuyo Suzuki, Miwako Masugi-Tokita, Hiroo Nakajima, Yuichiro Manabe, Takahiro Wada, Masako Bando

    2018 

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    Event date: 2018

    Venue:Osaka, Japan  

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  • Reconsideration of the concept "DDREF" based on LNT

    Masako Bando, Yuichiro Manabe, Takahiro Wada, Yuichi Tsunoyama, Hiroo Nakajima

    2018 

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    Venue:Chhicago, IL, USA  

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  • Dose-response relationship of childhood thyroid cancer cases found in Fukushima health management survey

    Yuichiro Manabe, Hiroshi Toki, Takahiro Wada, Masako Bando

    2018 

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    Venue:Chhicago, IL, USA  

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  • Mathematical analysis of the life-span shortening in mice induced by radiation

    Takahiro Wada, Tetsuhiro Kinugawa, Yuichiro Manabe, Masako Bando

    2018 

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    Venue:Chhicago, IL, USA  

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  • Life shortening in mice with radiation

    Takahiro Wada

    2018 

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    Venue:Charlotte, NC, USA  

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  • Analysis of childhood thyroid cancer incidence in Fukushima based on dose response relationship

    Takahiro Wada, Hiroshi Toki, Yuichiro Manabe, Toshihiro Higuchi, Masako Bando

    2017 

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    Venue:Paris, France  

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  • A mathematical model for the effects of radiation to the induced cancer in mice

    Takahiro Wada, Yuichiro Manabe, Masako Bando

    2017 

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    Venue:New Orleans, LU, USA  

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  • From DDREF to EDR - what the history of LNT indicates

    Masako Bando, Takahiro Wada, Yuichiro Manabe

    2017 

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    Venue:Paris, France  

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  • Ethics vs science - Lessons from Fukushima crisis

    Masako Bando, Takahiro Wada, Yuichiro Manabe, Yuichi Tsunoyama, Hiroo Nakajima, Toshihiro Higuchi

    2017 

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    Venue:Paris, France  

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  • From mutation to cancer -bridging the gap between radiobiology and medical use of ionizing radiation-

    Takahiro Wada

    2017 

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    Venue:Charlotte, NC, USA  

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  • Bridging the gap between radiobiology and medical use of ionizing radiation - JSPS committee -multidisciplinary research on biological effects of radiation-

    Takahiro Wada, Yuichiro Manabe, Masako Bando, Yoshiharu Yonekura

    2017 

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    Venue:Paris, France  

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  • A mathematical model to evaluate radiation-related biological effects - toward a unified and quantitative understanding

    Yuichiro Manabe, Takahiro Wada, Masako Bando

    2017 

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    Venue:Paris, France  

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  • Angular distribution of scission neutrons with time-dependent Schrodinger equation

    Takahiro Wada

    2016.11 

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    Event date: 2016.11

    Venue:Sanibel Island, FL, USA  

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  • Is LNT the best model for risk estimation? : Proposal of a new mathematical model for biological effects of radiation

    Takhhiro Wada, Yuichiro Manabe, Yuichi Tsunoyama, Hiroo Nakajima, Masako Bando

    2016.9 

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    Venue:Oxford, UK  

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  • A new model for biological effects of radiation and the driving force of molecular evolution

    Takahiro Wada, Yuichiro Manabe, Hiroo Nakajima, Yuichi Tsunoyama, Masako Bando

    2016.3 

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    Event date: 2016.3

    Venue:Baltimore, MD, USA  

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  • Study of biological effects of long-term exposure to low dose-rate radiation with Whack-A-Mole model

    Takhhiro Wada, Yuichiro Manabe, Issei Nakamura, Yuichi Tsunoyama, Hiroo Nakajima, Masako Bando

    2015.11 

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    Venue:Neuherberg, Germany  

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  • A unified description of biological effects caused by radiation exposure: Whack-a-mole (WAM) model

    Takahiro Wada, Yuichiro Manabe, Issei Nakamura, Masako Bando

    2015.3 

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    Venue:San Antonio, TX, USA  

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  • Effects of fission fragments on the angular distribution of scission particles

    Takahiro Wada, Tomomasa Asano, Nicolae Carjan

    2014.10 

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    Venue:Waikoloa, HW, USA  

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  • Effects of fission fragments on the angular distribution of scission particles

    Takahiro Wada, Tomomasa Asano, Nicolae Carjan

    2014.9 

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    Venue:Opatija, Croatia  

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  • Fluctuation-Dissipation Dynamics of Fission and Heavy-Ion Fusion Reactions

    Takahiro Wada

    2013.10 

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  • Re-Absorption and Scattering of Scission Neutrons by the Fission Fragments

    WADA Takahiro, NISHIOKA Ryo, ASANO Tomomasa

    2011 

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    Venue:Sinaia, Romania  

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  • Nuclear Fission of Fm Isotopes

    WADA Takahiro

    2010 

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  • A Dynamical Calculation of Multi-Modal Nuclear Fission

    WADA Takahiro

    2008 

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  • The r-Process Element Abundance with a Realistic Fission Fragment Mass Distribution

    WADA Takahiro

    2008 

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  • Neutron Capture Reactoin in Oxygen Nuclei near Threshold Energy Regions

    WADA Takahiro

    2008 

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  • Fission Modes of Neutron-Rich Nuclei in the r-Process Nucleosynthesis

    WADA Takahiro

    2008 

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  • Systematic Study for the Mass Distribution of Fission Fragments in the Neutron Rich Region

    WADA Takahiro

    2008 

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  • The Importance and the Sensitivity of the Reaction 17O(n, gamma)18O in the s-Process Nucleosynthesis

    WADA Takahiro

    2007 

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  • Fission Barrier for Neutron-Rich Nuclei by means of Skyrme-Hartree-Fock-Bogoliubov Calculation

    WADA Takahiro

    2007 

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  • A Reassessment of Surface Friction Model for Maximum Cold Fusion Reactions in Superheavy Mass Region

    WADA Takahiro

    2007 

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  • Fission Fragment Mass Distribution for Nuclei in the r-Process Region

    WADA Takahiro

    2007 

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  • Langevin Equation as a Stochastic Differential Equation in Nuclear Physics

    WADA Takahiro

    2007 

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  • Dynamics of the Neck Formation and Its Effect on the Fusion Probability

    WADA Takahiro

    2005 

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  • Multi-Modal Nuclear Fission in the Actinide Nuclei

    WADA Takahiro

    2004 

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  • Fission Modes Studied with Multi- Dimensional Langevin Approach

    WADA Takahiro

    2003 

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  • Reaction Theory for the Synthesis of Superheavy Elements

    WADA Takahiro

    2001 

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  • Theoretical Estimation of Evaporation Residue Cross Section for Production of SHE in the Framework of Fluctuation- Dissipation Model

    WADA Takahiro

    2001 

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  • Synthesis of Superheavy Elements: A Fluctuation-Dissipation Dynamical Approach

    WADA Takahiro

    2000 

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  • Fusion-Fission Dynamics for Synthesis of Superheavy Elements

    WADA Takahiro

    2000 

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  • Theory of Nuclear Reaction Leading to Superheavy Elements

    WADA Takahiro

    2000 

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  • Synthesis of Superheavy Elements with Three-Dimensional Fluctuation- Dissipation Dynamical Model

    WADA Takahiro

    2000 

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  • Theoretical Predictions of Residues Cross Sections of Superheavy Elements

    WADA Takahiro

    2000 

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  • Evaporation Reside Cross Section in Superheavy Region by One-Dimensional Diffusion Model

    WADA Takahiro

    1998 

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  • Angular Momentum Dependence of Prescission Particle Multiplicity in Medium Mass Nuclei

    WADA Takahiro

    1998 

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  • Fluctuation-Dissipation Model for Synthesis of Superheavy Elements

    WADA Takahiro

    1998 

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  • Stability of Atomic Clusters –Fission and Evaporation-

    WADA Takahiro

    1998 

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  • Fission and Evaporation of Atomic Clusters

    WADA Takahiro

    1998 

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  • Multi-Dimensional Diffusion Model for the Synthesis of Superheavy Elements

    WADA Takahiro

    1998 

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  • Dynamics of the Superheavy Element Synthesis with a Diffusion Model

    WADA Takahiro

    1998 

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  • Simulation for Fusion and Fusion- Fission Dynamics in Heavy Nuclei

    WADA Takahiro

    1998 

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  • A Novel Mechanism for the Synthesis of Superheavy Elements

    WADA Takahiro

    1998 

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  • Angular Momentum Dependence of Prescission Time and Mass Distribution for Medium Mass Nuclei

    WADA Takahiro

    1996 

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    Event date: 1996

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  • Fission as Dissipative Process

    WADA Takahiro

    1996 

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    Event date: 1996

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  • Dynamical Effect and Angular Momentum Dependence of Fission Phenomena in Medium Mass Nuclei

    WADA Takahiro

    1996 

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    Event date: 1996

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  • Dissipative Dynamics of Nuclear Fission

    WADA Takahiro

    1995 

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    Event date: 1995

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  • Multi-Dimensional Langevin Approach to the Dissipative Dynamics of Fission

    WADA Takahiro

    1992 

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    Event date: 1992

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  • Two-Dimensional Langevin Approach to Nuclear Fission

    WADA Takahiro

    1991 

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    Event date: 1991

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  • Decay Dynamics of Hot Nuclei

    WADA Takahiro

    1990 

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    Event date: 1990

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  • Resonating-Group-Method Study of -Nucleus Elastic Scattering

    WADA Takahiro

    1989 

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    Event date: 1989

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  • Resonating-Group-Method Study of the 3He Elastic Scattering and Nucleus- Nucleus Spin-Orbit Potential

    WADA Takahiro

    1989 

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    Event date: 1989

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  • Microscopic Nucleus-Nucleus Potential and Comparison of It with Optical Potential

    WADA Takahiro

    1987 

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    Event date: 1987

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  • Microscopic Study of Inter-Nucleus Potential on the Basis of the Resonating Group Method

    WADA Takahiro

    1983 

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    Event date: 1983

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  • Microscopic Study of Inter-Nucleus Potential on the Basis of the Resonating Group Method

    WADA Takahiro

    1983 

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    Event date: 1983

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  • A Mathematical Model for Analyzing the Effects of Protracted Irradiation on Cancer and Lifespan in Mice

    KINUGAWA, Tesuhiro, MANABE, Yuichiro, SATO, Fuminobu, WADA, Takahiro

    5th European Radiation Protection Week  2021.11 

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    Venue:Vienna, Austria  

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  • Interpretation for Radiation-Induced Aging Based on a Mathematical Model

    WADA,Takahiro, KINUGAWA, Tetsuhiro

    5th European Radiation Protection Week  2021.11 

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    Venue:Vienna, Austria  

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Research Projects

  • A Novel Framework "Hierarchical Model" for Radiation Health Risk Estimation

    Grant number:22K04987  2022.4 - 2025.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant amount:\4160000 ( Direct Cost: \3200000 、 Indirect Cost:\960000 )

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  • A new mathematical model for biological effects of radiation

    Grant number:16H04637  2016.4 - 2020.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    WADA Takahiro

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    Grant amount:\13520000 ( Direct Cost: \10400000 、 Indirect Cost:\3120000 )

    We investigated the biological effects of radiation using a mathematical model (WAM model) which takes account of the recovery effects of the living organism. We examined the mega-mouse data of Oak Ridge National Laboratory in detail and demonstrated the validity of the WAM model. We also showed that the dose-rate dependence of the experimental data of the protracted irradiation of Drosophila can be reproduced by taking account of recovery effects in the WAM model.
    We published a paper on the correlation between the incidence of childhood thyroid cancer in each municipality announced in the Fukushima Prefecture Health Survey and the radiation dose data measured several months after the earthquake. We also formulated a mathematical model to describe the life-shortening in mice in the protracted irradiation with low dose-rate radiation.

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  • Comparative analysis of physics, epidemiology and biology recognition cultures on radiation and biological effects

    Grant number:16H03094  2016.4 - 2019.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Bando Masako, Higuchi Toshihiro

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    Grant amount:\9100000 ( Direct Cost: \7000000 、 Indirect Cost:\2100000 )

    We have launched a website and reported research by comparing and analyzing recognizing culture in the fields of physics, molecular biology and epidemiology in Japan through the issue of biological effects of radiation (
    http://radi.rirc.kyoto-u.ac.jp/sci/index.html).(1) We conducted a questionnaire (preliminary survey and full-scale survey) to scientists in different fields, and published analysis results on the actual situation of cross-sectoral interaction and radiation risk assessment. (2) Conduct interviews of senior scientists who practice different fields of exchange, to which we can access via our website. Those who have accessed to this website are highly evaluate the contents. Through such study we are gradually approaching vivid image how we can organize vivid interaction among scientists and gradually have the notion of future organization which enables us to cooperation of scientists, bridging basic approach to solve wide-rage multidisciplinary problems.

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  • Dynamical Study of Scission Neutrons and Fragment Mass Distribution in Nuclear Fission

    Grant number:24540289  2012.4 - 2015.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    WADA Takahiro

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    Grant amount:\5200000 ( Direct Cost: \4000000 、 Indirect Cost:\1200000 )

    We investigated the angular distribution of scission neutrons and protons which are emitted at the moment of scission by solving the time-dependent Schroedinger equation. We clarified the effects of the fission fragments on the angular distribution of the scission particles.
    We investigated the fission process of heavy nuclei by means of the fluctuation-dissipation dynamics. By solving the multi-dimensional Langevin equation, we investigated the distribution of the mass and the total kinetic energy of the fragments for the fission of Fermium (Fm). We clarified that the symmetric fission components becomes donimant as the neutron number increases resulting in the qualitative change in the fragment mass and kinetic energy distributions. We investigated the parameterization to describe the various shapes that appear in the course of fission process and improved the calculation of the microscopic correction to the nuclear potential corresponding to each deformation.

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  • FLUCTUATION-DISSIPATION DYNAMICS OF FUSIOIN REACTION IN SUPERHEAVY MASS REGION AND MULTI-MODAL FISSION REACTION

    Grant number:17540270  2005 - 2007

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    WADA Takahiro

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    Grant amount:\3680000 ( Direct Cost: \3500000 、 Indirect Cost:\180000 )

    We have studied the fusion reaction in superheavy mass region and the multi-modal fission reaction in actinide region on the basis of the fluctuation-dissipation dynamics. A multi-dimensional Langevin equation has been used for numerical calculations.
    The four-dimensional Langevin equation is used to study the formation of superheavy nuclei after the contact of two ions. We pointed out the importance of the neck degree of freedom in the very early stage of the contact, because it has very small inertia.
    We have studied the multi-modal fission of actinide nuclei. We have examined the effect of the nuclear friction coefficient in the mass and kinetic energy distribution of the fragments. We pointed out that it is important to fit several physical quantities at the same time when we derive the nuclear friction coefficient.
    For the approaching phase, we have calculated the capture probability taking into account of the deformation and the orientation of the two ions. We pointed out that the original strength of the surface friction that was determined in deep inelastic collision may need to be reexamined for the study of the fusion process.
    We have studied the properties of the Langevin equation as a stochastic differential equation (SDE). In the integration of SDE, there are several ways of interpreting the stochastic integrals, for example Ito integral and Stratonovich integral. We compared the numerical results for fusion and fission process with two interpretations.
    We have also performed the systematic study of the fission barrier for neutron-rich nuclei. We applied it to estimate the element abundance in r-process nucleosynthesis. We pointed out the importance of the mass-asymmetric fission process. In the actinide region where the fission process takes place, the mass-asymmetric fission is dominant and the mass division is essentially determined by the shell correction in the potential energy surface.

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  • 多電荷金属クラスターの変形と分極

    Grant number:12874049  2000 - 2001

    日本学術振興会  科学研究費助成事業  萌芽的研究

    和田 隆宏, 阿部 恭久

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    Grant amount:\800000 ( Direct Cost: \800000 )

    研究計画に基づき,以下の研究を行った。
    多電荷金属クラスターにおける,イオン芯変形と電子分極の効果を巨視的な液滴模型を用いて研究した。典型的なアルカリ金属クラスターであるNaクラスターを例にとって調べた。
    本年度は,多電荷金属クラスターが外部電場中にあるときに,エネルギーを極小化するクラスターの変形と電子の分極について調べた。外部電場としては,一価イオンによる電場を考え,イオンとクラスターの距離を変化させながら,各距離での平衡変形を求めた。
    クラスター変形は二通りを仮定した。一つは,クラスターとイオンを結ぶ軸を対称軸とする変形であり,もう一つはこれと垂直な軸を対称軸とする変形である。一般に,もとのクラスターの分裂度(静電エネルギーを表面エネルギーの二倍で除した量で,この量が1になると球形からの四重極変形に対して不安定となる)が大きいほど平衡変形での変形度が大きくなることなどを見出した。クラスター・イオン軸に垂直な軸を対称軸とする変形を考えたときは,イオンが近づくと分裂度が0.8を超えるような場合にクラスターが不安定化する(変形が大きくなるほどエネルギーが下がる)ことが見出された。これは,クラスターが2つのほぼ同じ大きさの破片に分裂する可能性を示している。さらに,クラスター表面の各点において静電反発力と表面張力の比を取ることで局所的な分裂度を定義し,電子分極とクラスター変形の効果をより詳細に調べた。
    時間依存密度汎関数法により,多価イオンが金属クラスターの近傍を通過して電子を剥ぎ取る過程を調べた。これを,半古典的な理論による結果と比較し,主要な様相が一致することを確認した。

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  • FLUCUATION-DISSIPATION DYNAMICS IN THE FUSION-FISSION REACTION OF MASSIVE NUCLEI

    Grant number:10640287  1998 - 1999

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    WADA Takahiro, ABE Yasuhisa, OHTA Masahiro

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    Grant amount:\3300000 ( Direct Cost: \3300000 )

    We have studied various subjects concerning the fusion-fission reaction of massive nuclei from the viewpoint of fluctuation-dissipation dynamics.
    (1) We have studied the phenomenon of fusion hindrance in the fusion of massive nuclei with the 3-dimensional Langevin equation. We have estimated the incident energy necessary for fusion for ィイD1100ィエD1Mo+ィイD1100ィエD1Mo, ィイD1100ィエD1Mo+ィイD1110ィエD1Pd, and ィイD1110ィエD1Pd+ィイD1110ィエD1Pd systems. By using the statistical cascade code, we have estimated the evaporation residue cross section for these systems and compared them with the experiments.
    (2) We have studied the dynamics of the synthesis of superheavy elements with the 3-dimesional dissipative dynamical model to treat the mass-asymmetric incident channels. In 1999, there performed new experiments of the synthesis of the superheavy elements. In particular, the results of the ィイD148ィエD1Ca+ィイD1244ィエD1Pu reaction that was performed at Flerov Laboratory in Dubua, Russia is in good agreement with our theoretical prediction. In order to treat the low excitation energy experiment that was performed at Lawrence Berkeley Laboratory, USA, we have improved our calculation by taking into account of the shell correction energy from the fusion stage and the excitation energy dependence of the level density parameter that is originated from the shell correction.
    (3) To study systematics of the evaporation residue cross section and to predict the optimum condition for the synthesis of superheavy elements, we have parametrized the results of the dynamical calculation as functions of the incident energy, mass asymmetry, atomic and mass numbers of compound system.
    (4) We have utilized the mean first passage time of the Fokker-Planck equation to calculate the fission width in the case where the fission barrier is very low. We have incorporated this method in the cascade code and have estimated the survival probability against fission decay in the case of low fission barrier.

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  • DISSIPATIVE DYNAMICS OF HEAVY-ION FUSION-FISSION REACTION

    Grant number:08640398  1996 - 1997

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    WADA Takahiro, ABE Yasuhisa, OHTA Masahisa

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    Grant amount:\2200000 ( Direct Cost: \2200000 )

    We have studied various subjects concerning the heavy-ion fusion-fission reaction from the viewpoint of dissipative dynamics.
    (1) We have developed a computer code for solving a multi-dimensional Langevin equation. We have improved the interpolation routine to obtain a good performance especially on super computers. We can solve 3- and 4- dimensional Langevin equation without difficulties.
    (2) We have analyzed the experimental data on the angular momentum dependence of prescission time obtained from the coincidence measurements of gamma-ray and charged particles. We have reproduced the experimentally deduced prescission time, including its angular momentum dependence.
    (3) We have analyzed the phenomenon of fusion hindrance using the 2- and 3-dimensional Langevin equation. We have reproduced the experimental data for symmetric-like systems, and also calculated the systems with large mass asymmetry.
    (4) We have studied the dynamical process of the synthesis of superheavy elements by dissipative dynamical models. First, we used the 1-dimensional Smoluchowski equation. Then, for a more realistic estimation, we proposed to divide the process in two stages and used 2-dimensional Langevin equation and 2-dimensional Smoluchowski equation for respective stages. We have predicted that the maximum yield is obtained around E^<**>=25MeV.
    (5) We have analyzed the new data on the fission lifetime obtained with the crystal blocking method. We used the statistical model and the dissiative dynamical model.
    (6) We have studied the fission of excited nuclei using the microscopic nuclear friction coefficient calculated by Dr. Yamaji, RIKEN.

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  • 超重核合成の新しい機構

    Grant number:08213101  1996

    日本学術振興会  科学研究費助成事業  重点領域研究

    阿部 恭久, 和田 隆宏, 太田 雅久

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    Grant amount:\1400000 ( Direct Cost: \1400000 )

    核物質のエネルギー散逸係数(摩擦)が大変大きいことに着目し、超重核の生成・分裂をポテンシャル上の拡散過程として取り扱い、殻エネルギーの温度依存性から、超重核合成に最適励起エネルギーの存在することを明らかにした。そのために、重イオン核融合・分裂を記述する集団運動について、ポテンシャルエネルギーを液滴模型を用いて計算し、さらに超重核の安定性に重要な殻補正エネルギーを集団運動座標の関数として計算した。散逸動力学を記述する枠組としては、ランジュバン方程式あるいはFokker-Planck方程式が一般的であるが、ここでは、摩擦が強い場合に有効なSmoluchowski方程式を用いることにし、その数値解プログラムを開発した。
    粒子放出に対する統計模型プログラムの整備及び重要な準位密度パラメーターの温度及び変形に対する依存性を計算し、冷却過程の正確な計算を可能にした。
    上記Smoluchowski方程式の数値解プログラムに、求められた温度依存ポテンシャルエネルギー及びいわゆる一体散逸理論による摩擦係数を用いて、まず一次元模型について解析を行い、上記新機構のアイソトープ依存性を調べ、最適条件の存在領域を明らかにした。
    現在、質量非対称自由度等を含む、一般的な場合についての実行可能性、プログラム開発を行っている。
    そもそも拡散模型による超重核合成の研究は、世界的に初めてであり、新しい機構も従って、全く独創的である。世界的に先駆的な理論であり、超重核合成及び原子核研究に一時代を画すると期待している。いくつかの国際研究集会で発表を行い、注目されている。
    予備的結果は、現在、Physical Reviewで印刷中である。

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  • 超重核の分裂

    Grant number:07223102  1995

    日本学術振興会  科学研究費助成事業  重点領域研究

    阿部 恭久, 和田 隆宏, 太田 雅久

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    Grant amount:\1500000 ( Direct Cost: \1500000 )

    1.超重核は、Z=114,N=184の二重閉殻の存在から、その準安定性が期待されている。そこでまず、液滴模型でのエネルギー計算を行った。表面エネルギーとクローン・エネルギーの原子核の形状の関数として求めた。もちろん、通常の自然界に存在する元素と違って、安定点はなく、従って、たとえ形成されても、ただちに分裂を起こして崩壊する。閉殻に伴う補正エネルギーが重要な役割を演ずる訳であるから、これを一粒準位から計算した。これらの和は、10MeV程のポテンシャル・ポケットを球形近傍に有することがわかり、過去の計算と一致した。
    2.超重核の生成には、重イオン核反応を用いることになるので、必然的に励起した核をまず生成することになり、その時は殻補正エネルギーは消えていると予想される。従って、安定な超重核を得るためには、早く冷却させる必要がある。冷却の早さ及びそれに伴う殻補正エネルギーの回復の早さが重要となる。冷却は統計的な粒子放出(蒸発)により進行するので、その早さは原子核の準位密度及び反応のQ-値で決まる。従って、我々は準位密度パラメーターの計算を一体模型で行い、その形状及び温度依存を調べた。さらに殻補正エネルギーの形状及び温度依存も同様に調べた。後者は、Ignatyukの簡単な表式とよく一致することが解った。
    3.上記の知識に基づき、重イオン核反応で形成された二原子核複合体の動的振る舞いをFokker-Planck方程式を簡単化したSmoluchowski方程式を用いて解いた。
    4.集団的運動のエネルギー散逸の機構としては、One-body wall-and-window formulaを用いた。この公式の有効性は、代表者等によって、A=200原子核の分裂の解析から知られている。
    5.通常、殻補正エネルギーを利用することを念頭に置き、出来るだけ近い励起エネルギーの複合核を形成することを考えているが、我々の解析では、必ずしも最低エネルギーが最適ではなくE^*【similar or equal】30MeV近傍で、生成断面積が最大になることを発見した。
    6.これは、拡散による形成と殻補正エネルギーの回復による分裂防止との最適化になっている。現在、A Novel Mechanism for Synthesis of Superheavy ElementsとしてPhys.Rev.Lett.へ投稿中である。

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Social Activities

  • 日本学術振興会 産学協力研究委員会 第195委員会「放射線の利用と生体影響」 副委員長

    2019.4 - 2024.3

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  • 日本学術振興会 研究開発専門委員会「放射線の生体影響の分野横断的研究」 委員長

    2015.10 - 2018.9

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Devising educational methods

  • 「物理を学ぶ(電磁気学基礎)」と「電磁気学基礎演習」では、TA制度を活用し、演習科目と講義科目を連携させることで基礎科目の理解を深めるよう努めている。(2007~現在) 「物理学・応用物理学課題研究」では、少人数によるゼミ形式の講義を低学年時から取り入れることで研究室の雰囲気に触れる機会を作り、同時に教員との距離を縮めるよう図っている。(2007~現在) 「物理学・応用物理学概論1」では、独自の資料を毎回配布し、またレポート課題を毎週課すことで理解の浸透を図り、同時にレポートの書き方の指導を行っている。(2007~現在) 「量子力学A」では、講義科目にTA制度を取り入れ、かつ演習を多くすることで量子力学という新しい概念の浸透を図っている。(2010~現在) 「量子力学演習A」では、演習の解答をWEBで公開し、学生の自宅学習を支援した。(2009、2010) 「特別研究」では、秋学期には毎週研究報告会を実施し、プレゼンテーション力の向上を図っている。また、研究報告を学生間相互に批評させることで研究姿勢の深化を図っている。(2010~現在) 「物理を学ぶ(基礎物理学)」では、講義と演習を同じ週に行い、両者を連携することで理解の浸透を図っている。また、隔週に小テストを実施し、添削を行うことで単元ごとの理解を確認し、同時に学生の学習意欲を高めるよう努めている。(2010~現在)

Teaching materials

  • 「物理学・応用物理学概論1」:講義内容をまとめたプリントを毎回配布(2007~) 「量子力学演習A」:演習課題およびその解答をWEB上で配布(2009、2010)

Teaching method presentations

  •  特になし

Special notes on other educational activities

  • 修士論文の学会発表(1件)