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Is seniority a partial dynamic symmetry in the first $$nu$$$$g_{9/2}$$ shell?

Morales, A. I.*; Orlandi, R.; 61 of others*

By studying the $$beta$$ decay of the radioactive nuclei $$^{72}$$Co and $$^{74}$$Co produced at RIBF, RIKEN, the low-lying excited states in $$^{72,74}$$Ni were studied for the first time up to spin 8$$^+$$. These states originate from the valence neutrons occupying the $$g_{9/2}$$ orbit, and permit to investigate the seniority quantum number. The data reveal that the seniority isomerism of the 8$$^+$$ state disappears, and this phenomenon is explained by comparison with shell model calculations and the influence of spherical doubly-magic $$^{78}$$Ni.

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Category:Astronomy & Astrophysics

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