Surrogate reactions for neutron-induced fission reaction and capture reaction by heavy ion transfer reactions

重イオン核子移行反応を用いた代理反応の研究

牧井 宏之   ; 西尾 勝久   ; 廣瀬 健太郎  ; Orlandi, R.  ; Yan, S. Q.*; Lguillon, R.; Smallcombe, J.*; Vermeulen, M. J.; 西中 一朗*; 塚田 和明  ; 浅井 雅人  ; Andreyev, A. N.; 大槻 勤*; Tsekhanovich, I.*; Petrache, C. M.*

Makii, Hiroyuki; Nishio, Katsuhisa; Hirose, Kentaro; Orlandi, R.; Yan, S. Q.*; Lguillon, R.; Smallcombe, J.*; Vermeulen, M. J.; Nishinaka, Ichiro*; Tsukada, Kazuaki; Asai, Masato; Andreyev, A. N.; Otsuki, Tsutomu*; Tsekhanovich, I.*; Petrache, C. M.*

原子力機構タンデム加速器施設で進行中の、中性子反応核データを間接的に導出する代理反応の研究について紹介する。我々は重イオン核子移行反応で生成された複合核を同定するためのシリコンE-E検出器、核分裂片を検出するための多芯線比例計数管(MWPC)、複合核からの線を観測するためのコンプトン抑止型LaBr(Ce)シンチレータ、及び核分裂即発中性子を検出するための液体シンチレータから構成された測定装置の開発を行ってきた。得られた結果のうち、代理反応法で導出した核分裂断面積, 中性子捕獲断面積について議論する。

A project of the fission data measurement as well as the measurement of the neutron capture cross sections, using a surrogate method based on multi-nucleon transfer reactions, is running at JAEA. We have constructed appatus consists of a fission setup including four position-sensitive multi-wire proportional counters (MWPCs) to detect fission fragments and a capture setup containing two anti-Compton LaBr(Ce) spectrometers to measure the rays from the populated compound nuclei. Both setups contain a Si E-E detector to detect outgoing projectile-like particles by which we can identify the populated compound nuclei. We also placed 33 scintillators around the fission setup to detect fission neutrons in coincidence with the fission fragments. The measurements was carried out at the JAEA-Tokai tandem accelerator facility. In this contribution, we will present our results on neutron-induced fission and neutron capture cross sections by using the surrogate method.