Nuclear Spins and Moments of Ga Isotopes Reveal Sudden Structural Changes between N=40 and N=50

B. Cheal, E. Mané, J. Billowes, M. L. Bissell, K. Blaum, B. A. Brown, F. C. Charlwood, K. T. Flanagan, D. H. Forest, C. Geppert, M. Honma, A. Jokinen, M. Kowalska, A. Krieger, J. Krämer, I. D. Moore, R. Neugart, G. Neyens, W. Nörtershäuser, M. Schug, H. H. Stroke, P. Vingerhoets, D. T. Yordanov, and M. Žáková
Phys. Rev. Lett. 104, 252502 – Published 23 June 2010

Abstract

Collinear laser spectroscopy was performed on Ga (Z=31) isotopes at ISOLDE, CERN. A gas-filled linear Paul trap (ISCOOL) was used to extend measurements towards very neutron-rich isotopes (N=3650). A ground state (g.s.) spin I=1/2 is measured for Ga73, being near degenerate with a 3/2 isomer (75eVEex1keV). The Ga79 g.s., with I=3/2, is dominated by protons in the πf5/2 orbital and in Ga81 the 5/2 level becomes the g.s. The data are compared to shell-model calculations in the f5/2pg9/2 model space, calling for further theoretical developments and new experiments.

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  • Received 16 March 2010

DOI:https://doi.org/10.1103/PhysRevLett.104.252502

©2010 American Physical Society

Authors & Affiliations

B. Cheal1,*, E. Mané1, J. Billowes1, M. L. Bissell2, K. Blaum3, B. A. Brown4, F. C. Charlwood1, K. T. Flanagan5, D. H. Forest6, C. Geppert7,8, M. Honma9, A. Jokinen10,11, M. Kowalska12,3, A. Krieger8, J. Krämer8, I. D. Moore10,11, R. Neugart8, G. Neyens2, W. Nörtershäuser7,8, M. Schug3, H. H. Stroke13, P. Vingerhoets2, D. T. Yordanov3, and M. Žáková8

  • 1School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, United Kingdom
  • 2Instituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium
  • 3Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany
  • 4National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-1321, USA
  • 5I.P.N. Orsay, F-91940 Orsay Cedex, France
  • 6School of Physics and Astronomy, The University of Birmingham, Birmingham, B15 2TT, United Kingdom
  • 7GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
  • 8Institut für Kernchemie, Universität Mainz, D-55128 Mainz, Germany
  • 9Center for Mathematical Sciences, University of Aizu, Tsuruga, Ikki-machi, Aizu-Wakamatsu, Fukushima 965-8580, Japan
  • 10Department of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, Finland
  • 11Helsinki Institute of Physics, FIN-00014, University of Helsinki, Finland
  • 12Physics Department, CERN, CH-1211 Geneva 23, Switzerland
  • 13Department of Physics, New York University, New York, New York 10003, USA

  • *bradley.cheal@manchester.ac.uk

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Vol. 104, Iss. 25 — 25 June 2010

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