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Partial conservation of seniority and its unexpected influence on E2 transitions in nuclei
There exist two uniquely defined states in systems within a
subshell, which automatically conserve seniority and do not mix with other
states. Here I show that the partial conservation of seniority plays an
essential role in our understanding of the electric quadrupole transitions of
the semimagic nuclei involving subshells, including the long-lived
isomer in Ru. The effects of configuration mixing from
neighboring subshells on the structure of those unique states are analysed. It
is shown that a sharp transition from pure seniority coupling to a significant
mixture between the and states may be induced by the cross-orbital
non-diagonal interaction matrix elements. Such strong mixture is essential to
explain the observed E2 transition properties of isotones Pd and
Ru
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