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Loss of collectivit...
Loss of collectivity in the transitional Er-156 nucleus at high spin
- Article/chapterEnglish2009
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LIBRIS-ID:oai:lup.lub.lu.se:4566e3b8-9056-4f64-ac3d-8ad8abfe144e
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https://lup.lub.lu.se/record/1441922URI
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https://doi.org/10.1103/PhysRevC.79.044324DOI
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Language:English
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Summary in:English
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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.
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Rigby, S. V.
(author)
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Riley, M. A.
(author)
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Simpson, J.
(author)
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Appelbe, D. E.
(author)
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Campbell, D. B.
(author)
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Choy, P. T. W.
(author)
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Clark, R. M.
(author)
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Cromaz, M.
(author)
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Evans, A. O.
(author)
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Fallon, P.
(author)
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Goergen, A.
(author)
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Joss, D. T.
(author)
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Lee, I. Y.
(author)
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Macchiavelli, A. O.
(author)
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Nolan, P. J.
(author)
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Pipidis, A.
(author)
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Ward, D.
(author)
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Ragnarsson, IngemarLund University,Lunds universitet,Matematisk fysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Mathematical Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)matf-ira
(author)
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Matematisk fysikFysiska institutionen
(creator_code:org_t)
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In:Physical Review C (Nuclear Physics)79:40556-2813
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Paul, E. S.
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Rigby, S. V.
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Riley, M. A.
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Simpson, J.
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Appelbe, D. E.
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Campbell, D. B.
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Choy, P. T. W.
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Clark, R. M.
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Cromaz, M.
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Evans, A. O.
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Fallon, P.
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Goergen, A.
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Joss, D. T.
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Lee, I. Y.
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Macchiavelli, A. ...
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Nolan, P. J.
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Pipidis, A.
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Ward, D.
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Ragnarsson, Inge ...
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- NATURAL SCIENCES
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Lund University