Seniority and (9/2)^{n}  configurations in neutron-rich Nickel isotopes

Авторы: Sidorov S., Zhulyaeva D., Tretyakova T.
Журнал: Chinese Physics C
Том: 46
Год издания: 2022
Издательство: IOP Publishing
Местоположение издательства: [Bristol, UK], England
Номер статьи: 074102
DOI: 10.1088/1674-1137/ac5d29
Аннотация: Excited states in low-energy spectra of $ ^{70-76} $Ni are considered. Accordingly, pairing forces in the form of surface delta interaction are employed to account for the formation of the ground state multiplet with seniority $ \nu = 2 $ states. The multiplet splitting is described with mass relationships of masses of neighboring nuclei. Subsequently, the seniority model is adopted to reproduce or predict the states $ \nu = 3 $ in odd-even isotopes and $ \nu = 4 $ in even-even isotopes. The correct account of the $ 2_1^+ $ state should allow for the description of the reversed order of $ J = 4 $ states with $ \nu = 2 $ and $ \nu = 4 $ observed in experiments. The results obtained are compared with the structure of similar multiplets in $ N=50 $ isotones.
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