HIGH-SPIN STATES, PARTICLE-HOLE STRUCTURE, AND LINKED SMOOTH TERMINATING BANDS IN DOUBLY ODD SB-112

Excited states in Sb-112 have been observed with the Stony Brook array of six Compton-suppressed HPGe detectors and the Rh-103(C-12,3n) reac tion at 60 MeV using a thick target. New excited states which decay. s olely towards the tau(m)=773 ns, I-pi=8(-) isomer have been identified using time-correlated spectroscopy. The previously known level scheme has also been extended and corrected. In total, five rotational bands are observed, consisting of the two previously known strongly coupled bands based upon one-particle-one-hole (1p-1h) proton excitations acr oss the Z=50 shell gap and three newly observed decoupled bands based upon 2p-2h proton excitations. The 1p-1h bands: are interpreted as def ormed rotors, although there is a possibility that a shears mechanism like that observed in the lead region may also play a role. Results fr om a thin-target measurement using the Eurogam-II spectrometer and the Zr-90(P-31,2 alpha n) reaction at 150 MeV are also presented. These d ata have been,used to extend the decoupled bands up to I similar to 40 h, a spin regime where the bands exhibit the features of smooth band t ermination; The combined results from the two experiments have enabled two of the bands to be connected by discrete gamma-ray transitions to the low-spin level scheme, thereby determining their spins and pariti es. This allows for a definitive comparison with the results of cranke d Nilsson-Strutinsky calculations and excellent agreement is obtained. Further confirmation of the terminating band configuration assignment s is obtained from an analysis of the relative alignment properties of pairs of bands in the chain Sb110-112.