High-spin states in 35Ar and 35Cl have been populated in the 24Mg(16O, alphan) and 24Mg(16O, alphap) reactions, respectively, at a beam energy of 70 MeV. The comparison between the level schemes of these mirror nuclei shows a striking asymmetry in the population yield of high-spin analog states of positive parity, which indicates different intensities of E1 transitions connecting positive- and negative-parity structures in both nuclei. Large energy differences are observed between analog states of negative parity with configurations of dominant pure single-particle character. This results from the comparison with large-scale shell-model calculations in the s1/2d3/2f7/2p3/2 valence space. It is shown that important contributions to the energy differences arise from the multipole Coulomb and the relativistic electromagnetic spin-orbit interactions.
Isospin symmetry breaking at high spin in the mirror nuclei 35Ar and 35Cl / F. Della Vedova, S.M. Lenzi, M. Ionescu Bujor, N. Marginean, M. Axiotis, D. Bazzacco, A.M. Bizzeti-Sona, P.G. Bizzeti, A. Bracco, F. Brandolini, D. Bucurescu, E. Farnea, A. Iordachescu, S. Lunardi, T. Martinez, P. Mason, R. Menegazzo, B. Million, D.R. Napoli, M. Nespolo, P. Pavan, C. Rossi Alvarez, C.A. Ur, R. Venturelli, A.P. Zuker. - In: PHYSICAL REVIEW. C, NUCLEAR PHYSICS. - ISSN 0556-2813. - 75:3(2007), pp. 034317.034317.1-034317.034317.7.
Isospin symmetry breaking at high spin in the mirror nuclei 35Ar and 35Cl
A. Bracco;P. Mason;
2007
Abstract
High-spin states in 35Ar and 35Cl have been populated in the 24Mg(16O, alphan) and 24Mg(16O, alphap) reactions, respectively, at a beam energy of 70 MeV. The comparison between the level schemes of these mirror nuclei shows a striking asymmetry in the population yield of high-spin analog states of positive parity, which indicates different intensities of E1 transitions connecting positive- and negative-parity structures in both nuclei. Large energy differences are observed between analog states of negative parity with configurations of dominant pure single-particle character. This results from the comparison with large-scale shell-model calculations in the s1/2d3/2f7/2p3/2 valence space. It is shown that important contributions to the energy differences arise from the multipole Coulomb and the relativistic electromagnetic spin-orbit interactions.
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