Multipole mixing ratios of gamma rays emitted in the decay of polarized160Tb

Abstract

It has been demonstrated that successful nuclear polarization of terbium isotopes can be achieved by making use of the high internal field experienced when the activity is dissolved in a gadolinium lattice cooled to 10 mK. The isotope ¹⁶⁰Tb was chosen as an example, since some features of the decay have already been established by gamma gamma directional correlation methods. The directional distribution of the emitted radiation was used to determine the E2:M1 and M2:E1 multipole mixing ratios of thirteen gamma -ray transitions in ¹⁶⁰Dy. There is a general agreement with earlier results, and some values of previously undetermined M2:E1 multipole mixing ratios delta ( sigma _gamma ), were found.