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arXiv · 2203.03421

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

S. Sidorov·D. Zhulyaeva·T. Tretyakova
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Abstract

Excited states in low-energy spectra in $^{70-76}$Ni are considered. To this end, pairing forces in form of surface delta interaction are employed to account for formation of the ground state multiplet with seniority $ν= 2$ states. The multiplet splitting is described with mass relations of masses of neighbouring nuclei. Subsequently, seniority model is used to reproduce or predict the states $ν= 3$ in odd-even isotopes and $ν= 4$ in even-even isotopes. Correct account of $2_1^+$ state should allow for description of reversed order of states $J = 4$ with $ν= 2$ and $ν= 4$ observed in experiment. The results obtained are compared with the structure of similar multiplets in $N=50$ isotones.

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S. Sidorov, D. Zhulyaeva, T. Tretyakova. 2022-03-07. Seniority and $(\frac{9}{2})^n$ configurations in neutron-rich Nickel isotopes. https://doi.org/10.1088/1674-1137%2Fac5d29

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