High-Spin Structure beyond Band Termination in $^{157}\mathrm{Er}$

High-Spin Structure beyond Band Termination in ${}^{157}{Er}$

A. O. Evans, E. S. Paul, J. Simpson, M. A. Riley, D. E. Appelbe, D. B. Campbell, P. T. W. Choy, R. M. Clark, M. Cromaz, P. Fallon, A. Görgen, D. T. Joss, I. Y. Lee, A. O. Macchiavelli, P. J. Nolan, A. Pipidis, D. Ward, I. Ragnarsson, and F. Sarić

Phys. Rev. Lett. 92, 252502 – Published 25 June 2004

Abstract

The angular-momentum induced transition from a deformed state of collective rotation to a noncollective configuration has been studied. In ${}^{157}{Er}$ this transition manifests itself as favored band termination near $I = 45 ℏ$ . The feeding of these band terminating states has been investigated for the first time using the Gammasphere spectrometer. Many weakly populated states lying at high excitation energy that decay into these special states have been discovered. Cranked Nilsson-Strutinsky calculations suggest that these states arise from weakly collective “core-breaking” configurations.

Received 24 October 2003

DOI:https://doi.org/10.1103/PhysRevLett.92.252502

Authors & Affiliations

A. O. Evans¹, E. S. Paul¹, J. Simpson², M. A. Riley³, D. E. Appelbe², D. B. Campbell³, P. T. W. Choy¹, R. M. Clark⁴, M. Cromaz⁴, P. Fallon⁴, A. Görgen^4,*, D. T. Joss², I. Y. Lee⁴, A. O. Macchiavelli⁴, P. J. Nolan¹, A. Pipidis³, D. Ward⁴, I. Ragnarsson⁵, and F. Sarić⁵

¹Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
²CCLRC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom
³Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
⁴Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
⁵Department of Mathematical Physics, Lund Institute of Technology, P.O. Box 118, S-22100 Lund, Sweden

^*Present address: DAPNIA, USA/SPhN CEA-Saclay, Bat 703 l’Orme des Merisiers, F-91191 Gif-sur-Yvette, France.

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Vol. 92, Iss. 25 — 25 June 2004

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Physical Review Letters

High-Spin Structure beyond Band Termination in Er157

A. O. Evans, E. S. Paul, J. Simpson, M. A. Riley, D. E. Appelbe, D. B. Campbell, P. T. W. Choy, R. M. Clark, M. Cromaz, P. Fallon, A. Görgen, D. T. Joss, I. Y. Lee, A. O. Macchiavelli, P. J. Nolan, A. Pipidis, D. Ward, I. Ragnarsson, and F. Sarić

Phys. Rev. Lett. 92, 252502 – Published 25 June 2004

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High-Spin Structure beyond Band Termination in ${}^{157}{Er}$