Magnetic moments in the backbending region of 158Dy

Yrast levels in the backbending region of 158Dy were Coulomb excited with a 4.7 MeV/u 208Pb beam. Employing the transient field technique with a thin magnetized iron foil, the precessions of angular correlations of decay γ-rays from levels up to spin Isup(π) = 16+ were measured. The results show a clear reduction of the g-factor for states in the backbending region relative to that of the low-spin levels, thus demonstrating that the backbending of 158Dy is mainly caused by the alignment of isub(13/2) neutrons. In a similar experiment, precession measurements on Coulomb excited lowspin levels of 164Dy served to determine the static hyperfine field of Dy in Fe and the g-factor of the 6+ state in 164Dy. (orig.)