High-spin studies of fission products in fusion-evaporation reactions

High-spin states of several isotopes in the mass A similar to 100 region have been investigated following the fission of compound nuclei formed in three heavy-ion fusion-evaporation reactions. New sequences have been assigned to Sr-91, Ru-107 and Cd-113,Cd-115,Cd-117,Cd-119 isotopes using the complementary fission fragment technique. The ground-state bands have been extended to higher spins in Cd-114,Cd-116,Cd-118,Cd-120. The level schemes of Sr-88,Sr-90,Sr-92 and Tc-101 have been considerably enriched. The plethora of results demonstrates the efficiency in which spectroscopic information can be collected on nuclei near the line of stability or slightly neutron-rich from studies of fission fragments following fusion-evaporation reactions. The prompt gamma-ray intensity distributions of the fragments following the fission of the Pb-197 compound nucleus are reported. The empirical distributions as a function of Z and A are not reproduced by expected yields of symmetric fission. Rather these distributions reflect the selectivity of Gammasphere to detect collective nuclei and to study high-spin excitations in fission fragments.