Abstract
Low-lying high-spin yrast states in the exotic odd–odd isotopes 124–128Sb (Z=51) and 118–128In (Z=49), studied for the first time, show a striking difference in their observed γ-ray decay. With a single valence proton particle/hole occupying the g7/2/g9/2 spin-orbit partners, dominant electric quadrupole transitions occur in Sb as opposed to magnetic dipole transitions in In. The observed properties are explained on the basis of general principles of symmetry and with large-scale shell-model calculations, and reveal novel aspects of the competition between the neutron–proton interaction and the like-nucleon pairing interaction.
Highlights
Low-lying high-spin yrast states in the exotic odd–odd isotopes 124–128Sb ( Z = 51) and 118–128In ( Z = 49), studied for the first time, show a striking difference in their observed γ -ray decay
With a single valence proton particle/hole occupying the g7/2/g9/2 spin-orbit partners, dominant electric quadrupole transitions occur in Sb as opposed to magnetic dipole transitions in In
The magnetic moment μ of a level in an odd-mass nucleus is, in the extreme single-particle limit, given by the Schmidt value [2] that results from the parallel or anti-parallel coupling of the orbital angular momentum and the spin of the unpaired nucleon
Summary
Low-lying high-spin yrast states in the exotic odd–odd isotopes 124–128Sb ( Z = 51) and 118–128In ( Z = 49), studied for the first time, show a striking difference in their observed γ -ray decay. With a single valence proton particle/hole occupying the g7/2/g9/2 spin-orbit partners, dominant electric quadrupole transitions occur in Sb as opposed to magnetic dipole transitions in In. The observed properties are explained on the basis of general principles of symmetry and with large-scale shell-model calculations, and reveal novel aspects of the competition between the neutron–proton interaction and the like-nucleon pairing interaction.
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