Discrete and continuum Gamma-ray studies of 147Gd and 148Gd

Abstract

Discrete and continuum γ-ray studies of the N = 83, 84 nuclei 147Gd and 148Gd have been performed using ( 36S, 5n) and ( 36S, 4n) reactions on 116Cd. The level schemes of both nuclei have been extended to excitation energies above 18.5 MeV, with assigned spins up to 83 2 in 147Gd and up to 46in 148Gd. Evidence for a change in character along the yrast line from single particle to collective was found at the highest spins in 148Gd, but not in 147Gd. For 148Gd a study of γγ correlation matrices revealed a ridge-valley structure with a ridge spacing indicative of superdeformation. No evidence for a similar structure in 147Gd was found.