Spectroscopy of {sup 20}Mg: The isobaric mass multiplet equation for the 2{sup +} states of the A=20, T=2 quintet and distant mirror nuclei
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States)
- Department of Physics and Astronomy, Ursinus College, Collegeville, Pennsylvania 19426 (United States)
We report on the first determination of the 2{sub 1}{sup +} energy of {sup 20}Mg, the most neutron-deficient Mg isotope known to exist. The result, E(2{sub 1}{sup +})=1598(10) keV, obtained from in-beam {gamma}-ray spectroscopy following the two-neutron removal from a {sup 22}Mg 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{sup +} states in the {sup 20}F and {sup 20}Na isobars are presented. The mirror energy difference, E(2{sub 1}{sup +},{sup 20}Mg)-E(2{sub 1}{sup +},{sup 20}O)=-77(10) keV, is compared to a recent prediction within the nuclear shell model based on the 'USD'm - gap Z14<'' modification of the universal sd (USD) effective interaction.
- OSTI ID:
- 21061956
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 76, Issue 2; Other Information: DOI: 10.1103/PhysRevC.76.024317; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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