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.; Evans, A. O.; Fallon, P.; Goergen, A.; Joss, D. T.; Lee, I. Y.; Macchiavelli, A. O.; Nolan, P. J.; Pipidis, A.; Ward, D.; Ragnarsson, Ingemar

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

Mark

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)

Please use this url to cite or link to this publication: https://lup.lub.lu.se/record/1441922

author

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. (More)

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. ; Evans, A. O. ; Fallon, P. ; Goergen, A. ; Joss, D. T. ; Lee, I. Y. ; Macchiavelli, A. O. ; Nolan, P. J. ; Pipidis, A. ; Ward, D. and Ragnarsson, Ingemar ^LU (Less)

organization

Mathematical Physics

publishing date

2009

type

Contribution to journal

publication status

published

subject

Physical Sciences

in

Physical Review C (Nuclear Physics)

volume

79

issue

4

article number

044324

publisher

American Physical Society

external identifiers

wos:000266634300029
scopus:65649094407

ISSN

0556-2813

DOI

10.1103/PhysRevC.79.044324

language

English

LU publication?

yes

additional info

The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Mathematical Physics (Faculty of Technology) (011040002)

id

4566e3b8-9056-4f64-ac3d-8ad8abfe144e (old id 1441922)

date added to LUP

2016-04-01 12:53:37

date last changed

2022-04-13 22:06:21

@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.}},
  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}},
  doi          = {{10.1103/PhysRevC.79.044324}},
  volume       = {{79}},
  year         = {{2009}},
}

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