g factors of the 9 - and 11 - isomers in 194 Pb and 196 Pb: Confirguration mixing and deformation

The g factors of the 9(-) and 11(-) yrast states in Pb-194 and Pb-196 have been measured using the time-dependent perturbed angular distribution (TDPAD) technique. An analysis of the systematics of the properties of these states in the light Pb isotopes is presented. The results confirm the dominance of the nu(2f(5/2)(-1)1i(13/2)(-1)) configuration in the 9(-) isomer. The values for the 11(-) isomers are consistent with the pi(3s(1/2)(-2)1h(9/2)1i(13/2)) configuration, but they are smaller than those in the Po isotones. The effects of core excitation and particle-vibration coupling are considered, but these do not lead to a detailed agreement between theory and experiment. A Nilsson approach, however, gives good agreement, providing support for a proposed oblate deformation.

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