Two-quasiparticle states in 250Bk studied by decay scheme and transfer reaction spectroscopy

Two-quasiparticle states in 250Bk were investigated with decay scheme studies and the single-neutron transfer reaction 249Bk(d,p)250Bk. Mass-separated sources of 254Es were used for α singles and α-γ coincidence measurements. These studies, plus previous studies of 254Esm α decay and the 249Bk(n,γ) reaction, provide spins and parities of the observed levels. The transfer reaction 249Bk(d,p)250Bk was used to deduce neutron single-particle components of the observed bands. Six pairs of singlet and triplet states, formed by the coupling of proton and neutron one-quasiparticle states, were identified. The splitting energies between the triplet and singlet states were found to be in agreement with previous calculations