Oblately deformed isomeric proton-emitting state in 151Lu
Taylor, M. J., Cullen, D. M., Procter, M. G., Smith, A. J., McFarlane, A., Twist, V., . . . Doncel, M. (2015). Oblately deformed isomeric proton-emitting state in 151Lu. Physical Review C, 91 (4), 044322. doi:10.1103/PhysRevC.91.044322
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© 2015 American Physical Society. Published in this repository with the kind permission of the publisher.
Gamma rays from excited states feeding a proton-emitting isomeric-state in 151Lu 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.