Detailed γ-ray spectroscopy of 55Cr and 56Cr: Confirmation of the subshell closure at N=32

D. E. Appelbe, C. J. Barton, M. H. Muikku, J. Simpson, D. D. Warner, C. W. Beausang, M. A. Caprio, J. R. Cooper, J. R. Novak, N. V. Zamfir, R. A. E. Austin, J. A. Cameron, C. Malcolmson, J. C. Waddington, and F. R. Xu
Phys. Rev. C 67, 034309 – Published 18 March 2003
PDFExport Citation

Abstract

The nuclei 55,56Cr were populated to high spin following the reaction 48Ca(11B,pxn)58xCr at a beam energy of 35–40 MeV. The level scheme of 55Cr has been confirmed and extended to Jπ=252+. The level scheme of 56Cr has been extended to J=13. The spins and parity of the majority of levels have been determined unambiguously for the first time. The first firm evidence for an intruder band based on the νg9/2 orbital has been observed in 55Cr. In 56Cr, the position of the first 4+ state has been determined unambiguously and the presence of a subshell closure at N=32 has been confirmed on the basis of the E41+/E21+ systematics. The properties of both nuclei are compared with total Routhian surface calculations and with previous predictions of subshell closures at N=32 and 34. The systematics in the region are discussed in terms of the strong νf5/2πf7/2 interaction and its effect on the underlying single-particle structure.

  • Received 21 October 2002

DOI:https://doi.org/10.1103/PhysRevC.67.034309

©2003 American Physical Society

Authors & Affiliations

D. E. Appelbe, C. J. Barton, M. H. Muikku, J. Simpson, and D. D. Warner

  • CLRC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom

C. W. Beausang, M. A. Caprio, J. R. Cooper, J. R. Novak, and N. V. Zamfir*

  • Wright Nuclear Structure Laboratory, Yale University, 273 Whitney Avenue, New Haven, Connecticut 06511

R. A. E. Austin, J. A. Cameron, C. Malcolmson, and J. C. Waddington

  • Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1

F. R. Xu

  • Department of Technical Physics, Peking University, Beijing 100871, China

  • *Also at Clark University, Worcester, MA 01610 and National Institute for Physics and Nuclear Engineering, Bucharest, Romania.

References (Subscription Required)

Click to Expand
Issue

Vol. 67, Iss. 3 — March 2003

Reuse & Permissions
Access Options

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review C

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×