Surrogate reactions research at JAEA/Tokyo Tech

原子力機構・東京工業大学における代理反応研究

千葉 敏; 西尾 勝久   ; 牧井 宏之   ; 有友 嘉浩*; 西中 一朗; 石井 哲朗  ; 塚田 和明  ; 浅井 雅人  ; 古高 和禎  ; 橋本 慎太郎  ; 小浦 寛之   ; 緒方 一介*; 大槻 勤*; 永山 達郎*

Chiba, Satoshi; Nishio, Katsuhisa; Makii, Hiroyuki; Aritomo, Yoshihiro*; Nishinaka, Ichiro; Ishii, Tetsuro; Tsukada, Kazuaki; Asai, Masato; Furutaka, Kazuyoshi; Hashimoto, Shintaro; Koura, Hiroyuki; Ogata, Kazuyuki*; Otsuki, Tsutomu*; Nagayama, Tatsuro*

We will present a status of researches in surrogate reaction method using heavy-ions to determine neutron fission and capture cross sections of unstable nuclei. We take advantage of having (1) an electrostatic tandem accelerator which can deliver highly mono-energetic beams of heavy ions, (2) rich experience in in-beam spectroscopy, (3) rich experience in measuring fission fragments induced by heavy-ions, (4) nuclear theory and evaluation experiences. We have constructed apparatus to measure fission fragments and -rays in coincidence with ejectiles by which we can identify the populated compound nuclei. Primarily, we used O-induced reactions as well as He-induced reactions. We also investigated conditions under which such measurements lead to correct neutron cross sections. Results of the theoretical researches were published in a series of papers. In this presentation, status of results of the above researches will be summarized.