Gamma-gamma directional correlations in the decay of206Po

Abstract

Directional correlations of gamma-gamma cascades in the decay of 2~ have been measured for the first time. Using a multichannel goniometer with 2Ge(Li) and 6 NaI(Ti) detectors the A 2 and A 4 coefficients have been measured for five cascades in 2~From the results, E2/M1 mixing ratios of nine transitions are determined. Upper limits of the transition strengths are presented. Three of the measured mixing ratios are compared with theoretical estimates based on magnetic dipole and electric quadrupole moments of neighbouring nuclei.