No abstract

Properties of high-spin states in """"""Sb have been studied via the "Cd( Li,3n)" +'Sb reactions. Using Ge(Li) and Si(Li) detectors, in-beam measurements of y-ray excitation functions, y-y coincidences, y-ray angular distributions, and pulsed beam-y timing spectra weie made to determine level energies, decay schemes, y-ray multipolarities, J assignments, isomeric lifetimes, and a g factor. Systematic hJ = 1 bands built on low-lying 9/2+ proton-hole (2p-1h) states were observed in these nuclei. The bandheads that involve the excitation of a 1g9/2 proton across the Z = 50 shell achieve an energy minimum near the middle of the neutron shell. The observed properties of these bands are consistent with significant prolate deformations; the band spacings imply a deformation asymmetry of y = 20 in a triaxial rotor model. In addition, single-particle and single-particle plus core-excitation states were observed in these Sb nuclei. Two isomers were identified, a 19/2 state at 2796 keV in '"Sb (7 = 230+4 ns and g. = + 0.290+0,005) and a (27/2+) state in " Sb (7' = 1.23+ 0.13 s). NUCLEAR REACTIONSCd(6Li, 3n) " '~Sb measured y-y coincidences, y(E, O, t), spin rotation in B= 10.3 ko; deduced level schemes in odd-mass Sb, y multipolarities, J', T&&2, g-factor. Enriched targets, Ge(Li) detectors.

san, Phys. Rev. Lett. 35, 555 (1975).