High-spin structure in {sup 157}Er up to and above band termination
- Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE (United Kingdom)
- CCLRC Daresbury Laboratory, Daresbury, Warrington WA4 4AD (United Kingdom)
- Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States)
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
- Department of Mathematical Physics, Lund Institute of Technology, P.O. Box 118, S-22100 Lund (Sweden)
The high-spin structure of {sup 157}Er has been greatly expanded using the Gammasphere spectrometer to investigate the {sup 114}Cd({sup 48}Ca,5n) reaction at 215 MeV. Many new transitions have been placed in a greatly augmented level scheme up to spin 40({Dirac_h}/2{pi}) with many collective rotational sequences established. With increasing angular momentum, this nucleus undergoes a Coriolis-induced shape transition from a deformed state of collective rotation to a noncollective configuration. This transition manifests itself as favored band termination near I=45({Dirac_h}/2{pi}) in three rotational structures. Many weakly populated states lying at high excitation energy that decay into the terminating states have been discovered. Cranked-Nilsson-Strutinsky calculations suggest that the levels that feed the terminating states arise from weakly collective configurations that break the Z=64 semimagic core.
- OSTI ID:
- 20771579
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 73, Issue 6; Other Information: DOI: 10.1103/PhysRevC.73.064303; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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