Spectroscopy of Mg20: The isobaric mass multiplet equation for the 2+ states of the A=20, T=2 quintet and distant mirror nuclei

A. Gade, P. Adrich, D. Bazin, M. D. Bowen, B. A. Brown, C. M. Campbell, J. M. Cook, T. Glasmacher, K. Hosier, S. McDaniel, D. McGlinchery, A. Obertelli, L. A. Riley, K. Siwek, and D. Weisshaar
Phys. Rev. C 76, 024317 – Published 27 August 2007

Abstract

We report on the first determination of the 21+ energy of Mg20, the most neutron-deficient Mg isotope known to exist. The result, E(21+)=1598(10) keV, obtained from in-beam γ-ray spectroscopy following the two-neutron removal from a Mg22 secondary beam, is discussed in the framework of the isobaric mass multiplet equation (IMME). Resulting predictions for the excitation energies of the T=2,2+ states in the F20 and Na20 isobars are presented. The mirror energy difference, E(21+,Mg20)E(21+,O20)=77(10) keV, is compared to a recent prediction within the nuclear shell model based on the “USDm - gap Z14<” modification of the universal sd (USD) effective interaction.

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  • Received 10 April 2007

DOI:https://doi.org/10.1103/PhysRevC.76.024317

©2007 American Physical Society

Authors & Affiliations

A. Gade1,2, P. Adrich1, D. Bazin1, M. D. Bowen1,2, B. A. Brown1,2, C. M. Campbell1,2, J. M. Cook1,2, T. Glasmacher1,2, K. Hosier3, S. McDaniel1,2, D. McGlinchery3, A. Obertelli1, L. A. Riley3, K. Siwek1,2, and D. Weisshaar1

  • 1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
  • 2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
  • 3Department of Physics and Astronomy, Ursinus College, Collegeville, Pennsylvania 19426, USA

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Vol. 76, Iss. 2 — August 2007

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