Level scheme of high-spin states in 145Tb

High-spin states of Tb-143 have been studied via the Sn-118 (S-32, 1p4n) Tb-145 reaction by means of in-beam gamma-ray spectroscopy. Measurements of gamma-ray excitation functions and gamma-gamma-t coincidences were performed with 12 BGO ( AC) HPGe detectors. A level scheme for Tb-145 including 41 gamma-rays which come from the deexcitations of the 24 levels, has been established for the first time based on an analysis of the gamma-ray excitation functions, gamma-gamma coincidence relationships, intensity balances and cross-over transitions. The spins for most of the levels in the scheme are assigned according to the results of the measured gamma-ray anisotropies. Considering the structure similarity between Eu-143 and Th-145, the low-lying levels in Tb-145 are interpreted by coupling a h(9/2) proton to the excited states in (144) Gd core.