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Phys. Rev. C 76, 024317 (2007) [4 pages]

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

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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

Received 10 April 2007; published 27 August 2007

We report on the first determination of the 21+ energy of 20Mg, 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 22Mg 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 20F and 20Na isobars are presented. The mirror energy difference, E(21+,20Mg)-E(21+,20O)=-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.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.76.024317
DOI:
10.1103/PhysRevC.76.024317
PACS:
23.20.Lv, 27.30.+t, 21.10.Dr, 25.70.Mn
 
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