Production of superheavy nuclei in the fusion reaction between S34 and deformed nucleus U238

• Project/Area Number: 19540312
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Japan Atomic Energy Agency
• Principal Investigator: 西尾 勝久 Japan Atomic Energy Agency, 先端基礎研究センター, 研究副主幹 (70343928)
• Co-Investigator(Kenkyū-buntansha): IKEZOE Hiroshi 独立行政法人日本原子力研究開発機構, 先端基礎研究センター, 上級研究首席 (90355058) ; MITSUOKA Shin-ichi 独立行政法人日本原子力研究開発機構, 先端基礎研究センター, 研究主幹 (40354881) ; OHTSUKI Tsutomu 東北大学, 理学(系)研究科研究院, 準教授 (50233193)
• Project Period (FY): 2007 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2008: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2007: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: 超重元素 / 融合反応 / クーロン障壁 / 複合核 / ウラン238 / 硫黄34 / 新同位体 / 核分裂片質量数分布 / 準核分裂 / 捕獲断面積

Research Abstract

変形した原子核であるウラン238に硫黄34を融合させることにより、原子番号108の超重元素の新同位体Hs268(ハッシウム268)を合成した。この生成断面積および核分裂特性の測定から、融合反応における標的原子核の変形効果を明らかにし、超重元素の生成断面積の決定に必要な融合確率の決定方法を導いた。

Research Products

• [Journal Article] Effects of nuclear orientation on fission fragment mass distributions for the reactions using actinide nuclei (2009)
  • Author(s): K. Nishio, H. Ikezoe, S. Mitsuoka, I. Nishinaka, Y. Watanabe, Y. Nagame, T. Ohtsuki, K. Hirose, S. Hofmann
  • Journal Title: Proceedings of the 4^<th> International workshop on Nuclear Fission and Fission-product Spectroscopy, FISSION2009, Cadarache, France, AIP Conf. Proc. 1175 Pages: 111-118
  • URL: http://scitation.aip.org/dbt/dbt.jsp?KEY=APCPCS&Volume=1175&Issue=1
• [Journal Article] Effects of nuclear orientation on fusion and fission process in heavy ion reactions (2009)
  • Author(s): K. Nishio, H. Ikezoe, S. Mitsuoka, I. Nishinaka, Y. Watanabe, Y. Nagame, T. Ohtsuki, K. Hirose, S. Hofmann
  • Journal Title: Proceedings of the 6th Japan-Italy symposium on Heavy-Ion Physics, ASR2008, Tokai, Japan, 11-15. Nov. 2008, AIP Conf. Proc. 1120 Pages: 275-279
  • URL: http://scitation.aip.org/dbt/dbt.jsp?KEY=APCPCS&Volume=1120&Issue=1
• [Journal Article] Effects of nuclear orientation on fission fragment mass distributions in the reactions of ^<34,36>S+^<238>U (2009)
  • Author(s): K. Nishio, H. Ikezoe, S. Mitsuoka, I. Nishinaka, Y. Watanabe, Y. Nagame, T. Ohtsuki, K. Hirose, S. Hofmann
  • Journal Title: Proceedings of the New Aspects of heavy Ion Collisions Near the Coulomb Barrier", FUSION08, Chicago, USA22-26. Sep.2009, AIP Conf.Proc. 1098 Pages: 289-294
  • URL: http://scitation.aip.org/dbt/dbt.jsp?KEY=APCPCS&Volume=1098&Issue=1
  • Peer Reviewed
• [Journal Article] Effects of nuclear orientation of the mass distribution of fission fragments in the reaction of ^<36>S+^<238>U (2008)
  • Author(s): K. Nishio, H. Ikezoe, S. Mitsuoka, I. Nishinaka, Y. Nagame, Y. Watanabe, T. Ohtsuki, K. Hirose, S. Hofmann
  • Journal Title: Physical Review C 77
  • URL: http://prc.aps.org/abstract/PRC/v77/i6/e064607
  • Peer Reviewed
• [Journal Article] Observation of the 3n evaporation channel in the complete hot-fusion reaction ^<26>Mg+^<248>Cm leading to the new superheavy nuclei ^<271>Hs (2008)
  • Author(s): J. Dvorak, W. Bruchkle, M. Chelnokov, Ch. E. Dullmann, Z. Dvorakova, K. Eberhardt, E. Jager, R. Krucken, A. Kuznetsov, Y. Nagame, F. Nebel, K. Nishio, R. Perego, Z. Qin, M. Schadel, B. Schausten, E. Schmpf, R. Schuer, A. Semchenkov, P. Thorle, A. Turler, M. Wergrzecki, B. Wierczinski, A. Yakushev, A. Yeremin
  • Journal Title: Phys. Rev. Lett. 100
  • URL: http://prl.aps.org/abstract/PRL/v100/i13/e132503
  • Peer Reviewed
• [Journal Article] Orientation effects of deformed ^<238>U target nuclei on the fusion probability for heavy element synthesis (2008)
  • Author(s): K. Nishio, S. Hofmann, F. P. Hessberger, H. Ikeoze, D. Ackermann, S. Antalic, V. F. Comas, Z. Gan, S. Heinz, J. A. Heredia, J. Khuyagbaatar, B. Kindler, I. Kojouharov, P. Kuusiniemi, B. Lommel, R. Mann, M. Mazzocco, S. Mitsuoka, Y. Nagame, T. Ohtsuki, A. G. Popeko, S. Saro, H. J. Schoett, B. Sulignano, A. Svirikhin, K. Tsukada, K. Tsuruta, A. V. Yeremin
  • Journal Title: Proc. of the 23^<rd> International Nuclear Physics Conference, INPC2007, Tokyo, Nuc.Phys. A805 Pages: 516-518
• [Journal Article] Effects of nuclear orientation on the mass distribution of fission fragments in the reaction of ^<36>S+^<238>U (2008)
  • Author(s): K. Nishio, et al.
  • Journal Title: Physical Review C 77
  • Peer Reviewed
• [Presentation] ^<34>S+^<238>Uのサブバリヤエネルギー融合反応による新同位体^<268>Hsの合成 (2010)
  • Author(s): 西尾勝久, S. Hofmann, F. P. Hessberger, D. Ackermann, S. Antalic, V. F. Comas, Ch. E. Duellmann, A. Gorshkov, R. Graeger, S. Heinz, J. A. Heredia, 廣瀬健太郎, 池添博, J. Khuyagbaata, B. Kindler, I. Kojouharov, B. Lommel, R. Mann, 光岡真一, 永目諭一郎, 西中一朗, 大槻勤, A. G. Popeko, S. Saro, M. Schaedel, A. Tuerler, 渡辺裕, A. V. Yeremin, 有友嘉浩, 萩野浩一
  • Organizer: 日本物理学会第65回年次大会
  • Place of Presentation: 岡山大学 (岡山)
  • Year and Date: 2010-03-20
• [Presentation] ^<30>Si, ^<31>P, ^<40>Ar+^<238>U反応における準核分裂過程の実験的研究 (2009)
  • Author(s): 西尾勝久, 池添博, 光岡真一, 西中一朗, 牧井宏之, 永目諭一郎, 渡辺裕, 大槻勤, 廣瀬健太郎, S. Hofmann
  • Organizer: 日本原子力学会2009年秋の大会
  • Place of Presentation: 東北大学 (仙台)
  • Year and Date: 2009-09-16
• [Presentation] ^<30>Si+^<238>U反応の核分裂片質量数分布における標的原子核の変形効果 (2009)
  • Author(s): 西尾勝久, 池添博, 西中一朗, 光岡真一, 永目諭一郎, 渡辺裕, 大槻勤, 佐藤弘樹, 廣瀬健太郎, S. Hofmann
  • Organizer: 日本物理学会第64回年次大会
  • Place of Presentation: 立教大学 (東京)
  • Year and Date: 2009-03-28
• [Presentation] ^<30>Si+^<238>U反応の核分裂片質量数分布における標的原子核の変形効果 (2009)
  • Author(s): 西尾勝久, 他
  • Organizer: 日本物理学会第64回年次大会(立教大学)
  • Place of Presentation: 立教大学(東京)
  • Year and Date: 2009-03-28
• [Presentation] Effects of nuclear orientation on fusion and fission process for reactions using ^<238>U target nucleus (2009)
  • Author(s): K. Nishio, H. Ikezoe, S. Mitsuoka, I. Nishinaka, H. Makii, Y. Watanabe, Y. Nagame, T. Ohtsuki, K. Hirose, S. Hofmann
  • Organizer: (Invited) Tours Symposium on Nuclear Physics and Astrophysics VII
  • Place of Presentation: Kobe, Japan
• [Presentation] Effects of nuclear orientation on fusion and fission in the reaction using ^<238>U target nucleus (2009)
  • Author(s): K. Nishio, H. Ikezoe, S. Mitsuoka, I. Nishinaka, Y. Nagame, T. Ohtsuki, K. Hirose, S. Hofmann
  • Organizer: 2^<nd> International Workshop on Compound Nuclear Reactions and Relrated Topics
  • Place of Presentation: Bordeaux, France
• [Presentation] Effects of nuclear orientation on fusion and fission process for reactions using actinide target nuclei (2009)
  • Author(s): K. Nishio, H. Ikezoe, S. Mitsuoka, I. Nishinaka, H. Makii, Y. Nagame, Y. Watanabe, T. Ohtsuki, K. Hirose, S. Hofmann
  • Organizer: International Symposium on Exotic Nuclei, EXON2009
  • Place of Presentation: Sochi, Russia
• [Presentation] Effects of nuclear orientation on fission fragment mass distributions in the reaction of ^<34,36>S+^<238>U (2008)
  • Author(s): 西尾勝久, 他
  • Organizer: FUSION08 (International conference on new aspect of heavy ion collisions near the Coulomb barrier)
  • Place of Presentation: 米国・シカゴ
  • Year and Date: 2008-09-25
• [Presentation] アクチノイド原子核を標的とする反応の核分裂反応 (2008)
  • Author(s): 西尾勝久
  • Organizer: 京都大学基礎物理学研究所研究会「原子核の分子的構造と低エネルギー核反応」
  • Place of Presentation: 京都大学 (京都)
  • Year and Date: 2008-07-03
• [Presentation] ^<36>S+^<238>U反応の核分裂片質量数分布に対する^<238>Uの変形効果 (2008)
  • Author(s): 西尾勝久, 池添博, 光岡真一, 西中一朗, 永目諭一郎, 渡辺裕, 大槻勤, 廣瀬健太郎, S. Hofmann
  • Organizer: 日本物理学会第63回年次大会
  • Place of Presentation: 近畿大学 (大阪)
  • Year and Date: 2008-03-28
• [Presentation] ^<36>S+^<238>U反応のサブバリヤエネルギー領域における核分裂片質量数分布の測定 (2008)
  • Author(s): 西尾勝久, 池添博, 光岡真一, 西中一朗, 永目諭一郎, 渡辺裕, 大槻勤, 廣瀬健太郎
  • Organizer: 日本原子力学会2008年春の年会
  • Place of Presentation: 大阪大学 (大阪)
  • Year and Date: 2008-03-26
• [Presentation] Effects of nuclear orientation on fusion and fission process in heavy ion reactins (2008)
  • Author(s): 西尾勝久, 他
  • Organizer: 第6回:日本-イ夕リア間シンポジウム
  • Place of Presentation: 東海村・リコッティ
• [Presentation] S36+U238反応の核分裂片質量数分布に対するU238の変形効果(口頭) (2008)
  • Author(s): 西尾 勝久, 他
  • Organizer: 日本物理学会
  • Place of Presentation: 近畿大学(大阪)
• [Presentation] S36+U238反応のサブバリヤエネルギー領域における核分裂片質量数分布の測定(口頭) (2008)
  • Author(s): 西尾 勝久, 他
  • Organizer: 日本原子力学会
  • Place of Presentation: 大阪大学(大阪)
• [Presentation] Orientation effects of deformed ^<238>U target nuclei on the fusion probability for heavy element synthesis (2007)
  • Author(s): K. Nishio, S. Hofmann, H. Ikezoe, S. Mitsuoka, F. P. Hessberger, D. Ackermann, S. Antalic, V. F. Comas, Z. Gan, S. Heinz, J. A. Heredia, J. Khuyagbaatar, B. Kindler, I. Kojouharov, P. Kuusiniemi, B. Lommel, R. Mann, M. Mazzocco, Y. Nagame, T. Ohtsuki, A. G. Popeko, S. Saro, H. J. Schoett, B. Sulignano, A. Svirikhin, K. Tsukada, A. V. Yeremin
  • Organizer: Inernational Workshop on Nuclear Structure, NS07
  • Place of Presentation: Kyoto, Japan
• [Presentation] Orientation effects of deformed ^<238>U target nuclei on the fusion probability for heavy element synthesis (2007)
  • Author(s): K. Nishio, S. Hofmann, H. Ikezoe, D. Ackermann, S. Antalic, V. F. Comas, Z. Gan, S. Heinz, J. A. Heredia, F. P. Hessberger, J. Khuyagbaatar, B. Kindler, I. Kojouharov, P. Kuusiniemi, B. Lommel, R. Mann, M. Mazzocco, S. Mitsuoka, Y. Nagame, T. Ohtsuki, A. G. Popeko, S. Saro, H. J. Schoett, B. Sulignano, A. Svirikhin, K. Tsukada, A. V. Yeremin
  • Organizer: 3^<rd> International Conference on the Chemistry and Physics of the Transactinide Elements, TAN07
  • Place of Presentation: Davos, Switzerland
• [Presentation] Orientation effects of deformed U238 target nuclei on the fusion probability for the heavy element synthesis(oral presentation) (2007)
  • Author(s): K. Nishio, et. al.
  • Organizer: International Nuclear Physics Conference 2007(INPC2007), Tokyo
  • Place of Presentation: Tokyo
• [Presentation] Orientation effects of deformed U238 target nuclei on the fusion probability for heavy element synthesis(poster presentation) (2007)
  • Author(s): K. Nishio, et. al.
  • Organizer: Intern.Workshop on Nuclear Structure, (NSO7), Kyoto
  • Place of Presentation: Tyoto
• [Presentation] Orientation effects of deformed target nuclei on the fusion probability for heavy element synthesis (oral presentation) (2007)
  • Author(s): K. Nishio, et. al.
  • Organizer: 3rd.Intern.Conf.on the Chemistry and Physics of the Transactindie Elements
  • Place of Presentation: Davos,Switzerland