Oblately deformed isomeric proton-emitting state in Lu151

M. J. Taylor et al.
Phys. Rev. C 91, 044322 – Published 24 April 2015

Abstract

Gamma rays from excited states feeding a proton-emitting isomeric-state in Lu151 have been observed for the first time. Comparison with state-of-the-art nonadiabatic quasiparticle calculations indicates an oblately deformed, 3/2+ proton-emitting state with a quadrupole deformation of β2=0.11. The calculations suggest an increase in quadrupole deformation, to β2=0.18, with increasing spin which is understood in terms of the mixing of Nilsson states at the Fermi surface. It is also shown that the proton decay half-life is consistent with that from a 3/2+ state with a quadrupole deformation of β2=0.12.

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  • Received 14 November 2014
  • Revised 22 January 2015

DOI:https://doi.org/10.1103/PhysRevC.91.044322

©2015 American Physical Society

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Vol. 91, Iss. 4 — April 2015

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