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Phys. Rev. C 75, 064314 (2007) [8 pages]

Rotational structures and their evolution with spin in 152Gd

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D. B. Campbell1, R. W. Laird2, M. A. Riley3, J. Simpson4, F. G. Kondev5,6, D. J. Hartley7, R. V. F. Janssens5, T. B. Brown8, M. P. Carpenter5, P. Fallon9, S. M. Fischer10, T. Lauritsen5, D. Nisius5, and I. Ragnarsson11
1Lawrence Livermore National Laboratory, Livermore, California 94551, USA
2Department of Physics, Texas Lutheran University, Seguin, Texas 78023, USA
3Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
4CCLRC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, United Kingdom
5Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
6Nuclear Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
7Department of Physics, United States Naval Academy, Annapolis, Maryland 21402, USA
8Savannah River National Laboratory, Aiken, South Carolina 29802, USA
9Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
10Department of Physics, DePaul University, Chicago, Illinois 60614-3504, USA
11Division of Mathematical Physics, LTH, Lund University, Box 118, S-221 00, Lund, Sweden

Received 8 February 2007; published 19 June 2007

The fusion-evaporation reaction involving a 175 MeV 36S beam and a 124Sn target was performed, and the emitted γ rays were observed with the Gammasphere spectrometer. Significant additions to the level scheme of 152Gd were made in spite of the relative weakness of the α4n exit channel, being only ∼2% of the total fusion cross-section. The high-spin behavior of 152Gd was compared with that of other N=88 nuclei. A striking similarity was observed with 154Dy and it is therefore suggested that the angular-momentum-induced shape changes that take place in 154Dy also occur in 152Gd in the 30–40ħ spin range. This is supported by Cranked Nilsson-Strutinsky calculations which were used to interpret the high-spin bands. It is found that a better agreement between calculation and experiment is obtained if the Z=64 shell gap increases with a decreasing number of valence particles outside the doubly-closed 64146Gd82 nucleus.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.75.064314
DOI:
10.1103/PhysRevC.75.064314
PACS:
27.70.+q, 21.10.Re, 23.20.Lv
 
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