Non-yrast positive-parity structures in the $\ensuremath{\gamma}$-soft nucleus $^{156}\mathrm{Er}$

Non-yrast positive-parity structures in the $γ$ -soft nucleus ${}^{156}{Er}$

J. M. Rees, E. S. Paul, M. A. Riley, J. Simpson, A. D. Ayangeakaa, H. C. Boston, M. P. Carpenter, C. J. Chiara, U. Garg, D. J. Hartley, R. V. F. Janssens, D. S. Judson, F. G. Kondev, T. Lauritsen, N. M. Lumley, J. Matta, P. J. Nolan, J. Ollier, M. Petri, J. P. Revill, L. L. Riedinger, S. V. Rigby, C. Unsworth, X. Wang, and S. Zhu

Phys. Rev. C 83, 044314 – Published 22 April 2011

Abstract

Weakly populated band structures have been established in ${}^{156}{Er}$ at low to medium spins, following the ${}^{114}{Cd}$ ( ${}^{48}{Ca}$ , $6 n γ$ ) 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 $(ν h_{9 / 2}, f_{7 / 2})^{2}$ structure, coexisting with the systematically observed, more favorable $(ν i_{13 / 2})^{2}$ aligned structure seen in this mass region.

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Received 4 March 2011

DOI:https://doi.org/10.1103/PhysRevC.83.044314

Authors & Affiliations

J. M. Rees¹, E. S. Paul^1,*, M. A. Riley², J. Simpson³, A. D. Ayangeakaa⁴, H. C. Boston¹, M. P. Carpenter⁵, C. J. Chiara^5,6, U. Garg⁴, D. J. Hartley⁷, R. V. F. Janssens⁵, D. S. Judson¹, F. G. Kondev⁸, T. Lauritsen⁵, N. M. Lumley⁹, J. Matta⁴, P. J. Nolan¹, J. Ollier³, M. Petri¹⁰, J. P. Revill¹, L. L. Riedinger¹¹, S. V. Rigby¹, C. Unsworth¹, X. Wang², and S. Zhu⁵

¹Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
²Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
³STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom
⁴Physics Department, University of Notre Dame, Notre Dame, Indiana 46556, USA
⁵Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
⁶Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
⁷Department of Physics, United States Naval Academy, Annapolis, Maryland 21402, USA
⁸Nuclear Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
⁹Schuster Laboratory, University of Manchester, Manchester M13 9PL, United Kingdom
¹⁰Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
¹¹Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA

^*Corresponding author: esp@ns.ph.liv.ac.uk

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Vol. 83, Iss. 4 — April 2011

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Physical Review C

covering nuclear physics

Non-yrast positive-parity structures in the $γ$ -soft nucleus ${}^{156}{Er}$

Phys. Rev. C 83, 044314 – Published 22 April 2011

Abstract

Authors & Affiliations

Article Text (Subscription Required)

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Physical Review C

covering nuclear physics

Non-yrast positive-parity structures in the γ-soft nucleus Er156

Phys. Rev. C 83, 044314 – Published 22 April 2011

Abstract

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Non-yrast positive-parity structures in the $γ$ -soft nucleus ${}^{156}{Er}$