Several rotational bands have been populated in the Z=55 nucleus Cs125 using the fusion evaporation reaction Pd110(19F,4n), at a beam energy of 74 MeV. The resultant rays were detected using standard -ray spectroscopic techniques with an array of six Compton-suppressed Ge detectors and a fourteen-element bismuth-germanate ball. The low-lying yrast structure is found to be dominated by the unique parity h11/2 orbital, manifest as a decoupled band with a large signature splitting. A crossing occurs in this band at Latin small letter h with strokec=0.42 MeV, which is interpreted as [h11/2]2 pair alignment. In addition, a strongly coupled negative-parity structure with large B(M1)/B(E2) ratios is observed feeding both signatures of the h11/2 band. Bands built on the normal-parity g7/2 and g9/2-1 orbitals have also been confirmed and extended. These structures are compared to cranked-shell-model calculations and the systematics of the region.
ASJC Scopus subject areas
- Nuclear and High Energy Physics