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Revalidation of the isobaric multiplet mass equation for the A=20 quintet

B. E. Glassman, D. Pérez-Loureiro, C. Wrede, J. Allen, D. W. Bardayan, M. B. Bennett, B. A. Brown, K. A. Chipps, M. Febbraro, C. Fry, M. R. Hall, O. Hall, S. N. Liddick, P. O'Malley, W. Ong, S. D. Pain, S. B. Schwartz, P. Shidling, H. Sims, P. Thompson, and H. Zhang
Phys. Rev. C 92, 042501(R) – Published 29 October 2015

Abstract

An unexpected breakdown of the isobaric multiplet mass equation in the A=20,T=2 quintet was recently reported, presenting a challenge to modern theories of nuclear structure. In the present work, the excitation energy of the lowest T=2 state in Na20 has been measured to be 6498.4±0.2stat±0.4syst keV by using the superallowed 0+0+ beta decay of Mg20 to access it and an array of high-purity germanium detectors to detect its γ-ray deexcitation. This value differs by 27 keV (1.9 standard deviations) from the recommended value of 6525±14 keV and is a factor of 28 more precise. The isobaric multiplet mass equation is shown to be revalidated when the new value is adopted.

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  • Received 8 September 2015

DOI:https://doi.org/10.1103/PhysRevC.92.042501

©2015 American Physical Society

Authors & Affiliations

B. E. Glassman1,2,*, D. Pérez-Loureiro2,†, C. Wrede1,2,‡, J. Allen3, D. W. Bardayan3, M. B. Bennett1,2, B. A. Brown1,2, K. A. Chipps4,5, M. Febbraro4,5, C. Fry1,2, M. R. Hall3, O. Hall3, S. N. Liddick6,2, P. O'Malley3, W. Ong1,2, S. D. Pain4, S. B. Schwartz1,2, P. Shidling7, H. Sims8, P. Thompson4,5, and H. Zhang1,2

  • 1Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
  • 2National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
  • 3Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
  • 4Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 5Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 6Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
  • 7Cyclotron Institute, Texas A & M University College Station, Texas 77843, USA
  • 8University of Surrey, GU2 7XH, Guildford, United Kingdom

  • *glassman@nscl.msu.edu
  • perezlou@nscl.msu.edu
  • wrede@nscl.msu.edu

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Issue

Vol. 92, Iss. 4 — October 2015

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