Crossings in alternating-parity bands of neutron-rich Ba nuclei

摘要

sup 144 Ba and (sup 146)Ba nuclei produced in the spontaneous fission of (sup 248)Cm have been studied using the EUROGRAM II array. Spins and parities of excited levels have been deduced from triple-(gamma) angular correlation and direction-polarization correlation measurements, which is the first use of these techniques in studies of fission product nuclei. Ground-state, alternating-parity bands have been extended significantly and crossing in these bands has been found in both isotopes. For the first time alternating-parity band termination by particle alignment has been observed.