Surrogate reactions research at JAEA/Tokyo Tech

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.