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Fission study by multi-nucleon transfer reaction at JAEA

原子力機構での多核子移行反応を用いた核分裂研究

廣瀬 健太郎; 西尾 勝久; L$'e$guillon, R.; 牧井 宏之; 西中 一朗; Orlandi, R.; Smallcombe, J.; 石井 哲朗; 塚田 和明; 浅井 雅人; 太田 周也*; 永山 達郎*; 千葉 敏*; 大槻 勤*; 荒木 祥平*; 渡辺 幸信*; 立澤 遼太郎*; 高木 直行*; 田村 信行*; 後藤 真一*

Hirose, Kentaro; Nishio, Katsuhisa; L$'e$guillon, R.; Makii, Hiroyuki; Nishinaka, Ichiro; Orlandi, R.; Smallcombe, J.; Ishii, Tetsuro; Tsukada, Kazuaki; Asai, Masato; Ota, Shuya*; Nagayama, Tatsuro*; Chiba, Satoshi*; Otsuki, Tsutomu*; Araki, Shohei*; Watanabe, Yukinobu*; Tatsuzawa, Ryotaro*; Takaki, Naoyuki*; Tamura, Nobuyuki*; Goto, Shinichi*

We have developed a measurement system for the multi-nucleon transfer reaction and been studying fission of short-lived minor actinides and neutron-rich nuclides. The experiment was performed at the tandem accelerator facility of Japan Atomic Energy Agency where targets of $$^{238}$$U, $$^{232}$$Th, $$^{248}$$Cm were irradiated with $$^{18}$$O beams. In this experiment, more than ten nuclides were excited up to few tens of MeV at a time. Projectile-like scattered particles after the multi-nucleon transfer reaction were detected and identified using a $$Delta$$E-E silicon telescope. The mass distribution was deduced from the time difference between two fission fragments from the compound nucleus which were detected using two pairs of multi-wire proportional counters. Neutrons accompanied by fission were also measured using liquid scintillators placed around the reaction chamber. In the nucleon transfer reaction, the axis of the angular-momentum transfer can be determined from the direction of the scattered particle. This is one of the most different point from the neutron/ion-induced fusion-fission reaction where only the plane on which the axis lies can be determined. The fission angular distributions with respect to this axis as well as the mass yield, the prompt neutron multiplicity and so on will be presented.

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