High-spin states in 35Ar and 35Cl have been populated in the 24Mg(16O, αn) and 24Mg(16O, αp) 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.
Titolo: | Isospin symmetry breaking at high spin in the mirror nuclei 35Ar and 35Cl |
Autori: | |
Data di pubblicazione: | 2007 |
Rivista: | |
Abstract: | High-spin states in 35Ar and 35Cl have been populated in the 24Mg(16O, αn) and 24Mg(16O, αp) 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. |
Handle: | http://hdl.handle.net/11577/2433310 |
Appare nelle tipologie: | 01.01 - Articolo in rivista |