Spectroscopy ofMg20: The isobaric mass multiplet equation for the2+states of theA=20,T=2quintet and distant mirror nuclei
| Autor: | B. A. Brown, P. Adrich, Alexandra Gade, M. D. Bowen, C. M. Campbell, D. Weisshaar, J. M. Cook, A. Obertelli, K. E. Hosier, L. A. Riley, S. McDaniel, D. Bazin, K. Siwek, D. McGlinchery, T. Glasmacher |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Physical Review C. 76 |
| ISSN: | 1089-490X 0556-2813 |
| DOI: | 10.1103/physrevc.76.024317 |
| Popis: | We report on the first determination of the ${2}_{1}^{+}$ energy of $^{20}\mathrm{Mg}$, the most neutron-deficient Mg isotope known to exist. The result, $E({2}_{1}^{+})=1598(10)$ keV, obtained from in-beam \ensuremath{\gamma}-ray spectroscopy following the two-neutron removal from a $^{22}\mathrm{Mg}$ secondary beam, is discussed in the framework of the isobaric mass multiplet equation (IMME). Resulting predictions for the excitation energies of the $T=2,{2}^{+}$ states in the $^{20}\mathrm{F}$ and $^{20}\mathrm{Na}$ isobars are presented. The mirror energy difference, $E({2}_{1}^{+},$$^{20}\mathrm{Mg}$$)\ensuremath{-}E({2}_{1}^{+},$$^{20}\mathrm{O}$$)=\ensuremath{-}77(10)$ keV, is compared to a recent prediction within the nuclear shell model based on the ``${\mathrm{USD}}^{m}$ - gap Z14'' modification of the universal $\mathit{sd}$ (USD) effective interaction. |
| Databáze: | OpenAIRE |
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