Isospin symmetry breaking at high spin in the mirror nucleiAr35andCl35

• DOI: 10.1103/physrevc.75.034317
• Publication Date: 2007-03-27T15:24:46Z
• Authors: F. Della Vedova; S. M. Lenzi; M. Ionescu-Bujor; N. Mărginean; M. Axiotis; D. Bazzacco; A. M. Bizzeti-Sona; P. G. Bizzeti; A. Bracco; F. Brandolini; D. Bucurescu; E. Farnea; A. Iordachescu; S. Lunardi; T. Martínez; P. Mason; R. Menegazzo; B. Million; D. R. Napoli; M. Nespolo; P. Pavan; C. Rossi Alvarez; C. A. Ur; R. Venturelli; A. P. Zuker
• Keywords: 0103 physical sciences; 01 natural sciences

High-spin states in $^{35}\mathrm{Ar}$ and $^{35}\mathrm{Cl}$ have been populated in the $^{24}\mathrm{Mg}$($^{16}\mathrm{O}$, $\ensuremath{\alpha}n$) and $^{24}\mathrm{Mg}$($^{16}\mathrm{O}$, $\ensuremath{\alpha}p$) 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 ${s}_{1/2}{d}_{3/2}{f}_{7/2}{p}_{3/2}$ valence space. It is shown that important contributions to the energy differences arise from the multipole Coulomb and the relativistic electromagnetic spin-orbit interactions.