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Diverse collective excitations in Er-159 up to high spin

Mustafa, M.; Ollier, J.; Simpson, J.; Riley, M. A.; Paul, E. S.; Wang, X.; Aguilar, A.; Carpenter, M. P.; Darby, I. G. and Hartley, D. J., et al. (2011) In Physical Review C (Nuclear Physics) 84(5).
Abstract
A spectroscopic investigation of the gamma decays from excited states in Er-159 has been performed to study the changing structural properties exhibited as ultrahigh spins (I > 60 (h) over bar) are approached. The nucleus of Er-159 was populated by the reaction Cd-116(Ca-48, 5n gamma) at a beam energy of 215 MeV, and the resulting gamma decays were studied using the Gammasphere spectrometer. New rotational bands and extensions to existing sequences were observed, which are discussed in terms of the cranked shell model, revealing a diverse range of quasiparticle configurations. At spins around 50 (h) over bar, there is evidence for a change from dominant prolate collective motion at the yrast line to oblate non-collective structures via... (More)
A spectroscopic investigation of the gamma decays from excited states in Er-159 has been performed to study the changing structural properties exhibited as ultrahigh spins (I > 60 (h) over bar) are approached. The nucleus of Er-159 was populated by the reaction Cd-116(Ca-48, 5n gamma) at a beam energy of 215 MeV, and the resulting gamma decays were studied using the Gammasphere spectrometer. New rotational bands and extensions to existing sequences were observed, which are discussed in terms of the cranked shell model, revealing a diverse range of quasiparticle configurations. At spins around 50 (h) over bar, there is evidence for a change from dominant prolate collective motion at the yrast line to oblate non-collective structures via the mechanism of band termination. A possible strongly deformed triaxial band occurs at these high spins, which indicates collectivity beyond 50 (h) over bar. The high-spin data are interpreted within the framework of cranked Nilsson-Strutinsky calculations. (Less)
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Physical Review C (Nuclear Physics)
volume
84
issue
5
publisher
American Physical Society
external identifiers
  • wos:000297297000002
  • scopus:82955189138
ISSN
0556-2813
DOI
10.1103/PhysRevC.84.054320
language
English
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yes
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09903458-2879-47b9-826b-32b5f10650ca (old id 2271946)
date added to LUP
2011-12-29 15:07:22
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2017-01-01 05:52:43
@article{09903458-2879-47b9-826b-32b5f10650ca,
  abstract     = {A spectroscopic investigation of the gamma decays from excited states in Er-159 has been performed to study the changing structural properties exhibited as ultrahigh spins (I > 60 (h) over bar) are approached. The nucleus of Er-159 was populated by the reaction Cd-116(Ca-48, 5n gamma) at a beam energy of 215 MeV, and the resulting gamma decays were studied using the Gammasphere spectrometer. New rotational bands and extensions to existing sequences were observed, which are discussed in terms of the cranked shell model, revealing a diverse range of quasiparticle configurations. At spins around 50 (h) over bar, there is evidence for a change from dominant prolate collective motion at the yrast line to oblate non-collective structures via the mechanism of band termination. A possible strongly deformed triaxial band occurs at these high spins, which indicates collectivity beyond 50 (h) over bar. The high-spin data are interpreted within the framework of cranked Nilsson-Strutinsky calculations.},
  author       = {Mustafa, M. and Ollier, J. and Simpson, J. and Riley, M. A. and Paul, E. S. and Wang, X. and Aguilar, A. and Carpenter, M. P. and Darby, I. G. and Hartley, D. J. and Janssens, R. V. F. and Kondev, F. G. and Lauritsen, T. and Nolan, P. J. and Petri, M. and Rees, J. M. and Revill, J. P. and Rigby, S. V. and Teal, C. and Thomson, J. and Unsworth, C. and Zhu, S. and Carlsson, Gillis and Ma, Hailiang and Mufti, Tajdar and Ragnarsson, Ingemar},
  issn         = {0556-2813},
  language     = {eng},
  number       = {5},
  publisher    = {American Physical Society},
  series       = {Physical Review C (Nuclear Physics)},
  title        = {Diverse collective excitations in Er-159 up to high spin},
  url          = {http://dx.doi.org/10.1103/PhysRevC.84.054320},
  volume       = {84},
  year         = {2011},
}