The effects of magnetic dipole core polarization in 206Pb and 207Pb

Abstract

The effects of magnetic dipole core polarization on dipole moments and M1 transition rates in 206Pb and 207Pb are studied in the framework of the weak-coupling model. The coupling potential between a particle and the M1 states of the core nucleus 208Pb is calculated microscopically and used to estimate the admixtures of these magnetic dipole states in the relevant states of 206Pb and 207Pb. The qualitative agreement with experiment is good, except for the p 3 2 −1→ p 1 2 −1 transition strength and the f 3 2 −1 dipole moment. The calculations also yield some general features of magnetic moments, M1 decays and their interrelation based on purely geometrical considerations. Finally, exchange effects are studied and found to be rather small.