Competing shapes in light Tl nuclei

Abstract

In-beam γ-ray spectroscopic experiments have been performed on 191Tl, 189Tl, and 187Tl, and multiple band structures are established. These enable a study of the shape competition in the transitional region below the Z = 82 gap. Among the structures observed for the first time in odd-A Tl are bands built on the low-K prolate πh9/2, low-K oblate πh11/2, and perhaps high-K oblate πi13/2 excitations.