Experimental studies of fission mechanism

Hirose, Kentaro  ; Nishio, Katsuhisa   ; Makii, Hiroyuki   ; Orlandi, R.  ; Tsukada, Kazuaki  ; Asai, Masato  ; Sato, Tetsuya   ; Ito, Yuta   ; Suzaki, Fumi  ; Tanaka, Shoya*; Aritomo, Yoshihiro*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Niwase, Toshitaka*; Jeong, S. C.*; Miyatake, Hiroari*; Mukai, Momo*; Kubono, Shigeru*; Andreyev, A. N.*; Tsekhanovich, I.*

At the JAEA Tokai tandem accelerator facility, we have been studying fission mechanism using multi-nucleon transfer reactions (MNT) through fission observables such as fission-fragment mass distributions, fission probabilities, prompt-fission neutrons, and so on. The MNT reaction is also expected one of viable reactions to produce super-heavy nuclei with more neutrons. The angular momentum transferred in the MNT reaction is an important property since it influences a survival probability of a compound nucleus. In the present study, the angular momentum transferred in MNT reactions are experimentally deduced using fission. In MNT reactions, the axis of the angular-momentum transfer can be defined as perpendicular to the reaction plane. The fission-fragment angular distribution measured with respect to this axis, thus, strongly reflects the angular momentum. We performed measurements of the fission-fragment angular distribution, and deduced the angular momenta transferred to the produced compound nuclei. In this workshop, details of the experiment and results will be presented as well as other experimental activities.