Abstract
The yrast bands of neutron-deficient 126–130Ce nuclei are studied by using the projected shell model approach. Energy levels, moments of inertia and B(E2) transition probabilities are calculated and compared with the available experimental data. The first and second backbending in 128,130Ce are investigated. The question as to why the backbending becomes sharp as the neutron number increases in cerium isotopes is addressed. It turns out that the first backbending is caused by a proton pair and the second backbending in 128,130Ce is due to a simultaneous proton and neutron pair breaking.
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