HIGH-SPIN STATES IN NEUTRON-RICH NUCLEI FROM SPONTANEOUS FISSION

One fragment-gamma-gamma and three gamma-gamma coincidence measurements of the prompt gamma-rays from the fragments produced in the spontaneous fission (SF) of Cf-252 and very recently of Pu-242 were carried out with a 20 Ge detector ball at HHIRF. With our high statistics, gamma-gamma-gamma coincidences where the two gates are on transitions in the two partner Fragments were extracted. Comparing the Cf-252 and (242)pU data allowed unique placements of many transitions. New, higher spin states were observed in many nuclei, up to 16(+) in some of the heavy partners. Levels in several nuclei were observed for the first time. Studies of the fission process included measured relative branchings to the In to 6n channels. Much data remains to be analyzed. These data provide new insights into the changing structures at higher spins of many neutron-rich nuclei and the fission process.