Regular Article - Theoretical Physics
Microscopic shell-model description of transitional nuclei
Joint Institute for Nuclear Research, Dubna, Russia
2 Institute of Mechanics, Bulgarian Academy of Sciences, Sofia, Bulgaria
Accepted: 11 September 2022
Published online: 21 September 2022
A recently proposed microscopic version of the Bohr-Mottelson collective model, defined by the following dynamical symmetry chain of the proton-neutron symplectic model (PNSM), is applied to the microscopic shell-model description of the low-lying collective excitations in two transitional nuclei, namely Ru and Os. Detailed shell-model results are presented for the excitation levels of the ground and bands in Ru, and the ground, , and bands in Os, as well as for the probability distributions and the quadrupole collectivity. A good overall description is obtained for the excitation energies of the bands under consideration for the two transitional nuclei without using an adjustable kinetic-energy term, as well as for the ground state intraband B(E2) quadrupole collectivity and the known interband B(E2) transition probabilities between the low-lying collective states without the use of an effective charge.
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