Abstract
The high-spin structure of the nucleus 183 Re has been studied following the 176 Yb( 11 B,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.
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