High-spin, multiparticle isomers in Sb121,123

G. A. Jones, S. J. Williams, P. M. Walker, Zs. Podolyák, S. Zhu, M. P. Carpenter, J. J. Carroll, R. S. Chakrawarthy, P. Chowdhury, I. J. Cullen, G. D. Dracoulis, A. B. Garnsworthy, G. Hackman, R. V. F. Janssens, T. L. Khoo, F. G. Kondev, G. J. Lane, Z. Liu, D. Seweryniak, and N. J. Thompson
Phys. Rev. C 77, 034311 – Published 25 March 2008

Abstract

Isomers in near-spherical Z=51, antimony isotopes are reported here for the first time using fusion-fission reactions between Al27 and a pulsed Hf178 beam of energy, 1150 MeV. γ rays were observed from the decay of isomeric states with half-lives, T1/2=200(30) and 52(3)μs, and angular momenta I=(252) and Iπ=232+, in Sb121,123, respectively. These states are proposed to correspond to ν(h112)2 configurations, coupled to an odd d52 or g72 proton. Nanosecond isomers were also identified at Iπ=192 [T1/2=8.5(5) ns] in Sb121 and Iπ=(152) [T1/2=37(4) ns] in Sb123. Information on spins and parities of states in these nuclei was obtained using a combination of angular correlation and intensity-balance measurements. The configurations of states in these nuclei are discussed using a combination of spin/energy systematics and shell-model calculations for neighboring tin isotones and antimony isotopes.

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  • Received 31 May 2007

DOI:https://doi.org/10.1103/PhysRevC.77.034311

©2008 American Physical Society

Authors & Affiliations

G. A. Jones1,*, S. J. Williams1,2, P. M. Walker1, Zs. Podolyák1, S. Zhu3, M. P. Carpenter3, J. J. Carroll4, R. S. Chakrawarthy2, P. Chowdhury5, I. J. Cullen1, G. D. Dracoulis6, A. B. Garnsworthy1, G. Hackman2, R. V. F. Janssens3, T. L. Khoo3, F. G. Kondev7, G. J. Lane6, Z. Liu1, D. Seweryniak3, and N. J. Thompson1

  • 1Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
  • 2TRIUMF, 4004 Westbrook Mall, Vancouver, British Columbia, V6T 2A3, Canada
  • 3Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 4Department of Physics and Astronomy, Youngstown State University, Youngstown, Ohio 44555, USA
  • 5University of Massachusetts Lowell, Lowell, Massachusetts 01854, USA
  • 6Department of Nuclear Physics, RSPhysSE, Australian National University, Canberra 0200, Australia
  • 7Nuclear Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA

  • *gareth.jones2@barcap.com

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Vol. 77, Iss. 3 — March 2008

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