Non-yrast positive-parity structures in the γ-soft nucleus Er156
- Rees, J.M.
- Paul, E.S.
- Riley, M.A.
- Simpson, J.
- Ayangeakaa, A.D.
- Boston, H.C.
- Carpenter, M.P.
- Chiara, C.J.
- Garg, U.
- Hartley, D.J.
- Janssens, R.V.F.
- Judson, D.S.
- Kondev, F.G.
- Lauritsen, T.
- Lumley, N.M.
- Matta, J.
- Nolan, P.J.
- Ollier, J.
- Petri, M.
- Revill, J.P.
- Riedinger, L.L.
- Rigby, S.V.
- Unsworth, C.
- Wang, X.
- Zhu, S.
DOIAbstract
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,f 7/2)2 structure, coexisting with the systematically observed, more favorable (νi13/2)2 aligned structure seen in this mass region
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