Rotational and multi-quasiparticle excitations in Re-183

摘要

The high-spin structure of the nucleus Re-183 has been studied following the Yb-176(B-11,4n) reaction, High-K, multi-quasiparticle excitations compete with collective: rotation in the formation of the yrast and near-yrast structures. Broken-pair (i(13/2))(2) excitations (t-bands) play a dominant role. generating considerable angular momentum both along and perpendicular to the prolate symmetry axis. The stability of axially symmetric, prolate shapes is explored through comparisons with potential-energy-surface calculations. The possible onset of oblate rotation at high angular momentum is discussed. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 37]