Analytic proof of partial conservation of seniority in $j=9/2$ shells

Details Analytic proof of partial conservation of seniority in $j=9/2$ shells Analytic proof of partial conservation of seniority in $j=9/2$ shells

2012-02-17

arxiv.org/abs/1202.3923v1

Physics

Nuclear Physics

Nuclear Theory

17 pages

Scientific paper

A partial conservation of the seniority quantum number in $j=9/2$ shells has been found recently in a numerical application. In this paper a complete analytic proof for this problem is derived as an extension of the work by Zamick and P. Van Isacker [Phys. Rev. C 78 (2008) 044327]. We analyze the properties of the non-diagonal matrix elements with the help of the one-particle and two-particle coefficients of fractional parentage (cfp's). It is found that all non-diagonal (and the relevant diagonal) matrix elements can be re-expressed in simple ways and are proportional to certain one-particle cfp's. This remarkable occurrence of partial dynamic symmetry is the consequence of the peculiar property of the $j=9/2$ shell, where all $v=3$ and 5 states are uniquely defined.

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