Phys. Rev. C 75, 011302(R) (2007) [5 pages]

Identification of the g_9/2 proton and neutron band crossing in the N=Z nucleus ⁷⁶Sr

Abstract

References

Citing Articles (2)

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P. J. Davies¹, A. V. Afanasjev^2,3, R. Wadsworth¹, C. Andreoiu^4,5, R. A. E. Austin^6,*, M. P. Carpenter⁷, D. Dashdorj⁸, S. J. Freeman^7,9, P. E. Garrett^4,10, A. Görgen¹¹, J. Greene⁷, D. G. Jenkins¹, F. L. Johnston-Theasby¹, P. Joshi¹, A. O. Macchiavelli¹², F. Moore⁷, G. Mukherjee^7,†, W. Reviol¹³, D. Sarantites¹³, D. Seweryniak⁷, M. B. Smith¹⁰, C. E. Svensson⁴, J. J. Valiente-Dobon^4,‡, and D. Ward¹²
¹Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
²Department of Physics and Astronomy, Mississippi State University, Mississippi 39762, USA
³Laboratory of Radiation Physics, Institute of Solid State Physics, University of Latvia, LV 2169 Salaspils, Miera str. 31, Latvia
⁴Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
⁵Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 3BX, United Kingdom
⁶Department Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4K1, Canada
⁷Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
⁸North Carolina State University, Rayleigh, North Carolina, 27695, USA
⁹The School of Physics and Astronomy, University of Manchester, Manchester M15 9PL, United Kingdom
¹⁰TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3, Canada
¹¹CE Saclay, Daphnia/SphN, F-91191 Gif-sur-Yvette Cedex France
¹²Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
¹³Department of Chemistry, Washington University, St. Louis, Missouri 63130, USA

Received 27 June 2006; published 30 January 2007

High-spin states in ⁷⁶Sr have been studied using Gammasphere plus Microball detector arrays. The known yrast band has been extended beyond the first band crossing, which involves the simultaneous alignment of pairs of g_9/2 protons and neutrons, to a tentative spin of 24ℏ. The data are compared with the results of cranked relativistic mean-field (CRMF) and cranked relativistic Hartree-Bogoliubov (CRHB) calculations. The properties of the band, including the g_9/2 proton/neutron band crossing frequency and moments of inertia, are found to be well reproduced by the CRHB calculations. Furthermore, the unpaired CRMF calculations show quite good agreement with the data beyond the band crossing region, indicating that pairing is weak at these frequencies. The high spin results suggest that there is little evidence for an isoscalar (t=0) np pair field. Moreover, a systematic study of the band crossings in even-even N=Z nuclei for the first time reveals that there is no evidence to support the existence of the Coulomb antipairing effect caused by the Coulomb exchange term.

URL:

http://link.aps.org/doi/10.1103/PhysRevC.75.011302

DOI:

10.1103/PhysRevC.75.011302

PACS:

21.30.Fe, 21.10.Re, 21.60.Ev, 27.50.+e

^*Present address: Saint Mary's University, Halifax NS B3H 3C3, Canada.

^†Present address: GANIL, BP 5027, Caen, Cedex F-14021, France.

^‡Present address: INFN, Laboratory Nationali di Legnaro, I-35020, Italy.

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Phys. Rev. C 75, 011302(R) (2007) [5 pages]

Identification of the g9/2 proton and neutron band crossing in the N=Z nucleus 76Sr

Identification of the g_9/2 proton and neutron band crossing in the N=Z nucleus ⁷⁶Sr