Abstract
An on-line angular correlation facility to measure directional correlation coefficients of gamma-ray cascades following thermal neutron capture is described. The apparatus has been used to measure gamma-gamma directional correlations in 162,164Dy and multipolarities of sixteen transitions in 162Dy and nine in 164Dy were determined. In addition, new coincidence relationships were found in both isotopes. The transitions between the gamma and ground bands have been considered theoretically using the symmetric rotor model of Bohr and Mottelson, (1975).