Two-quasineutron states in 24898Cf and 25098Cf and the neutron-neutron residual interactions

Two-quasineutron states in Cf-248 and Cf-250 were investigated by single-neutron transfer reactions, Cf-249(d,t)Cf-248 and Cf-249(d,p)Cf-250. The majority of levels observed were assigned to 12 bands in Cf-248 and six bands in Cf-250, constructed from the single-particle states in neighboring Cf nuclei. The effective two-body interactions between two odd neutrons coupled outside a deformed core were deduced from the differences in the energies of the bandheads formed by the parallel and antiparallel coupling of the intrinsic spins of the two single-particle states.