Evolution of collectivity in 126,128Xe studied in Coulomb excitation measurements
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Physics - Nuclear physics and radiation physics↗
Engineering topics
Mizusaki, T
Publications and source records attributed to Mizusaki, T.
Isospin symmetry breaking at high spins in the mirror pair {sup 67}Se and {sup 67}As
Recent experimental data have revealed large mirror energy differences (MED) between high-spin states in the mirror nuclei {sup 67}Se and {sup 67}As, the heaviest pair where MED have been determined so far. The MED are generally attributed to the isospin symmetry breaking caused by the Coulomb force and by the isospin-nonconserving part of the nucleon-nucleon residual interaction. The different contributions of the various terms have been extensively studied in the fp shell. By employing large-scale shell-model calculations, we show that the inclusion of the g{sub 9/2} orbit causes interference between the electromagnetic spin-orbit and the Coulomb monopole radial terms at high spin. The large MED are attributed to the aligned proton pair excitations from the p{sub 3/2} and f{sub 5/2} orbits to the g{sub 9/2} orbit. The relation of the MED to deformation is discussed.
73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗
Recent Progress in Shell-Model Calculations for pfg-shell Nuclei
The structure of upper pf-shell nuclei is studied by the nuclear shell model, taking a model space consisting of four spherical single-particle orbits p{sub 3/2}, f{sub 5/2}, p{sub 1/2} and g{sub 9/2}. The effective interaction JUN45 is used, which is obtained by modifying empirically the renormalized G-matrix interaction. The oblate-prolate shape coexistence in {sup 68}Se is predicted consistently with the experimental observations, indicating the applicability of the shell model to the cases with moderate deformation. The calculated high-spin band structure highlights the important role played by the g{sub 9/2} orbit. The appearance of the j{sub p}-j{sub n} multiplets in {sup 88}Y is successfully described except for a few cases such as the 1{sub 1}{sup +} state, suggesting the good property of the effective proton-neutron interaction inherited from the renormalized G-matrix.
73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗