Non-yrast positive-parity structures in the gamma-soft nucleus Er-156 - INSPIRE

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Non-yrast positive-parity structures in the gamma-soft nucleus Er-156

Apr, 2011

7 pages

Published in:

Phys.Rev.C 83 (2011) 044314

DOI:

10.1103/PhysRevC.83.044314

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Abstract: (APS)

Weakly populated band structures have been established in Er156 at low to medium spins, following the Cd114(Ca48,6nγ) reaction at 215 MeV. High-fold γ-ray coincidence data were recorded in a high-statistics experiment with the Gammasphere spectrometer. Bands built on the second 0+ and 2+ (γ-vibrational) states have been established. A large energy staggering between the even- and odd-spin members of the γ-vibrational band suggests a γ-soft nature of this nucleus. An additional band is discussed as being based on a rotationally aligned (νh9/2,f7/2)2 structure, coexisting with the systematically observed, more favorable (νi13/2)2 aligned structure seen in this mass region.

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27.70.+q
21.10.Re
23.20.En

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