New transitions and levels for 163Tb obtained from β-decay studies

Transitions in 163Tb following β decay of 163Gd were obtained as part of investigations of γ rays emitted following 163Euβ decay to 163Gd. Detailed analysis of the low-energy structure of 163Tb has been carried out with these data to expand previous β-decay studies and reactions studies of levels in 163Tb. Data were collected at the LeRIBSS station of the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory with an array of four Clover HPGe detectors for γ rays and two plastic scintillators for β detection. The γ rays were identified as belonging to 163Gd and 163Tb via mass election and γ-γ-β, γ-γ, or γ-x-ray coincidence. In total, 38 new γ-ray transitions were observed in 163Tb from 15 newly identified levels and 12 previously identified levels. Potential energy surface calculations were performed which support a rigid prolate deformation. Previously identified unplaced transitions in 163Tb have been placed within the level scheme of 163Tb and additional states and transitions have been identified.