Elucidation of the Anomalous A=9 Isospin Quartet Behavior

M. Brodeur, T. Brunner, S. Ettenauer, A. Lapierre, R. Ringle, B. A. Brown, D. Lunney, and J. Dilling
Phys. Rev. Lett. 108, 212501 – Published 23 May 2012

Abstract

Recent high-precision mass measurements of Li9 and Be9, performed with the TITAN Penning trap at the TRIUMF ISAC facility, are analyzed in light of state-of-the-art shell model calculations. We find an explanation for the anomalous isobaric mass multiplet equation behavior for the two A=9 quartets. The presence of a cubic d=6.3(17)keV term for the Jπ=3/2 quartet and the vanishing cubic term for the excited Jπ=1/2 multiplet depend upon the presence of a nearby T=1/2 state in B9 and Be9 that induces isospin mixing. This is contrary to previous hypotheses involving purely Coulomb and charge-dependent effects. T=1/2 states have been observed near the calculated energy, above the T=3/2 state. However, an experimental confirmation of their Jπ is needed.

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  • Received 12 March 2012

DOI:https://doi.org/10.1103/PhysRevLett.108.212501

© 2012 American Physical Society

Authors & Affiliations

M. Brodeur1,2,3,*, T. Brunner1,4, S. Ettenauer1,2, A. Lapierre1,3, R. Ringle1,3, B. A. Brown3, D. Lunney5, and J. Dilling1,2

  • 1TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
  • 2Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
  • 3National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
  • 4Physik Department E12, Technische Universität München, James Franck Straße, Garching, Germany
  • 5CSNSM-IN2P3-CNRS, Université Paris 11, 91405 Orsay, France

  • *Corresponding author. brodeur@nscl.msu.edu

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Vol. 108, Iss. 21 — 25 May 2012

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