Several collective structures have been populated in the Z=55 nucleus Cs123 following the Pd108(19F,4n) fusion-evaporation reaction at a beam energy of 76 MeV. The low-lying structure is found to be dominated by a decoupled rotational band built on the unique-parityh11/2 orbital. Rotational structures based on the normal-parity g7/2 proton and the g9/2 proton-hole orbitals are also observed. Rotational alignments occur in the h11/2 band at Latin small letter h with strokec 0.44 MeV, and in the g9/2-1 band at Latin small letter h with strokec=0.38 MeV, both attributed to the rotational alignment of a pair of h11/2 neutrons, despite the different crossing frequency. In addition, the -vibrational band built on the h11/2 orbital has been observed feeding both signatures of the corresponding rotational cascade. These results are compared to cranked shell model calculations and to the systematics of the region.
ASJC Scopus subject areas
- Nuclear and High Energy Physics