Fission studies using multi-nucleon transfer reactions

多核子移行反応を用いた核分裂過程の実験研究

西尾 勝久   

Nishio, Katsuhisa

We are promoting a program of fission studies using multi-nucleon transfer reactions. This approach allows us to investigate fission of neutron-rich nuclei, which cannot be populated by particle capture reactions. From the measurement of fission fragment mass distributions (FFMDs) for various nuclides and their evolution with initial excitation energy, role of multi-chance fission, i.e. neutron emission prior to fission, on FFMD was investigated. The obtained large data set of FFMDs was used to improve the Langevin model to describe low-energy fission, which was applied to the fissions of fermium isotopes. The results explain the origin of the onset of sharp symmetric fission appearing in neutron-rich fermium isotopes. In the presentation, we will also discuss other data obtained in our setup, such as fission barrier height and prompt neutrons in correlation with fission fragments.