Nontrivial aspects of the onset of nuclear collectivity: Static moments

We consider several topics concerning static magnetic dipole and electric quadrupole moments (μ and Q) as signatures of the onset of nuclear collectivity. Having previously noted that in 50Cr there is an abrupt change of sign in Q of yrast states with Jπ=10+,12+, and 14+ relative to lower J states, we discuss whether these states are oblate or prolate. We next show that configuration mixing leads to much larger changes in Q than in μ. We then look for other bands of interest in 50Cr. Finally we discuss the Jolos endash von Brentano relationship which relates Q of 21+ states to B(E2)close-quote s for transitions from and to the 21+ states. copyright 1996 The American Physical Society