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Loss of collectivity in the transitional Er-156 nucleus at high spin

Paul, E. S.; Rigby, S. V.; Riley, M. A.; Simpson, J.; Appelbe, D. E.; Campbell, D. B.; Choy, P. T. W.; Clark, R. M.; Cromaz, M. and Evans, A. O., et al. (2009) In Physical Review C (Nuclear Physics) 79(4).
Abstract
The Cd-114(Ca-48, 6n gamma) reaction at 215 MeV has been investigated using the Gammasphere spectrometer to study the high-spin structure of the nucleus Er-156(68)88. Many new transitions have been established along with 68 definitive spin-parity level assignments from a high-fold angular-distribution analysis. In addition, absolute B(M 1) and B(E 1) strengths have been inferred from measured gamma-ray branching ratios. Strong B(E 1) strength (10(-3) W.u.) is discussed in terms of possible octupole collectivity at low spin. At high spin, this nucleus undergoes a Coriolis-induced shape transition from a prolate state of collective rotation to a noncollective, triaxial-oblate configuration. The yrast positive-parity structure ultimately... (More)
The Cd-114(Ca-48, 6n gamma) reaction at 215 MeV has been investigated using the Gammasphere spectrometer to study the high-spin structure of the nucleus Er-156(68)88. Many new transitions have been established along with 68 definitive spin-parity level assignments from a high-fold angular-distribution analysis. In addition, absolute B(M 1) and B(E 1) strengths have been inferred from measured gamma-ray branching ratios. Strong B(E 1) strength (10(-3) W.u.) is discussed in terms of possible octupole collectivity at low spin. At high spin, this nucleus undergoes a Coriolis-induced shape transition from a prolate state of collective rotation to a noncollective, triaxial-oblate configuration. The yrast positive-parity structure ultimately terminates in an energetically favored oblate state at I-pi = 42(+). Several weak high-energy gamma-ray transitions have been discovered that feed this favored state. State-of-the-art cranked Nilsson-Strutinsky calculations are used to interpret the high-spin behavior of Er-156 and comparisons are made with other N = 88 isotones. (Less)
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Physical Review C (Nuclear Physics)
volume
79
issue
4
publisher
American Physical Society
external identifiers
  • wos:000266634300029
  • scopus:65649094407
ISSN
0556-2813
DOI
10.1103/PhysRevC.79.044324
language
English
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yes
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4566e3b8-9056-4f64-ac3d-8ad8abfe144e (old id 1441922)
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2009-07-27 15:01:50
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2017-01-01 05:21:00
@article{4566e3b8-9056-4f64-ac3d-8ad8abfe144e,
  abstract     = {The Cd-114(Ca-48, 6n gamma) reaction at 215 MeV has been investigated using the Gammasphere spectrometer to study the high-spin structure of the nucleus Er-156(68)88. Many new transitions have been established along with 68 definitive spin-parity level assignments from a high-fold angular-distribution analysis. In addition, absolute B(M 1) and B(E 1) strengths have been inferred from measured gamma-ray branching ratios. Strong B(E 1) strength (10(-3) W.u.) is discussed in terms of possible octupole collectivity at low spin. At high spin, this nucleus undergoes a Coriolis-induced shape transition from a prolate state of collective rotation to a noncollective, triaxial-oblate configuration. The yrast positive-parity structure ultimately terminates in an energetically favored oblate state at I-pi = 42(+). Several weak high-energy gamma-ray transitions have been discovered that feed this favored state. State-of-the-art cranked Nilsson-Strutinsky calculations are used to interpret the high-spin behavior of Er-156 and comparisons are made with other N = 88 isotones.},
  articleno    = {044324},
  author       = {Paul, E. S. and Rigby, S. V. and Riley, M. A. and Simpson, J. and Appelbe, D. E. and Campbell, D. B. and Choy, P. T. W. and Clark, R. M. and Cromaz, M. and Evans, A. O. and Fallon, P. and Goergen, A. and Joss, D. T. and Lee, I. Y. and Macchiavelli, A. O. and Nolan, P. J. and Pipidis, A. and Ward, D. and Ragnarsson, Ingemar},
  issn         = {0556-2813},
  language     = {eng},
  number       = {4},
  publisher    = {American Physical Society},
  series       = {Physical Review C (Nuclear Physics)},
  title        = {Loss of collectivity in the transitional Er-156 nucleus at high spin},
  url          = {http://dx.doi.org/10.1103/PhysRevC.79.044324},
  volume       = {79},
  year         = {2009},
}