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Chinese Physics C > 2022, Vol. 46 > Issue(7): 074102 DOI: 10.1088/1674-1137/ac5d29

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

  • 1.

    Faculty of Physics, Lomonosov Moscow State University, Moscow 119991, Russia

  • 2.

    Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow 119991, Russia

  • 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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S. Sidorov, D. Zhulyaeva and T. Tretyakova. Seniority and ${ \left(\frac{\bf 9}{{\bf 2}}\right)^{\boldsymbol n} }$ configurations in neutron-rich Nickel isotopes[J]. Chinese Physics C. doi: 10.1088/1674-1137/ac5d29
S. Sidorov, D. Zhulyaeva and T. Tretyakova. Seniority and ${ \left(\frac{\bf 9}{{\bf 2}}\right)^{\boldsymbol n} }$ configurations in neutron-rich Nickel isotopes[J]. Chinese Physics C. doi:10.1088/1674-1137/ac5d29 shu
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