Fission study of actinide nuclei using multi-nucleon transfer reactions

Lguillon, R.; Nishio, Katsuhisa   ; Hirose, Kentaro  ; Orlandi, R.  ; Makii, Hiroyuki   ; Nishinaka, Ichiro; Ishii, Tetsuro  ; Tsukada, Kazuaki  ; Asai, Masato  ; Chiba, Satoshi*; Otsuki, Tsutomu*; Araki, Shohei*; Watanabe, Yukinobu*; Tatsuzawa, Ryotaro*; Takaki, Naoyuki*

We are promoting a campaign to measure fission-fragment mass distributions for various actinide nuclei populated by multi-nucleon transfer reactions. They include neutron-rich nuclei which cannot be accessed by fusion reaction. An unique feature of the transfer-reaction is that we can populate excited states from the ground state up to several tens MeV, allowing us to obtain the excitation energy dependence of the fragment mass distributions. The experiment was carried out at the 20 MV JAEA tandem facility at Tokai. We report on the data obtained in the reaction O + Th. Transfer-channels and excitation energies of the fissioning nuclei were identified using silicon dE-E detectors. Two fission fragments were detected in coincidence using multi-wire proportional counters. Fission fragment masses were determined by kinematic consideration. We obtained data for 13 nuclei from actinium to uranium.