The quadrupole moments of195–197Aum(11/2) and the low temperature thermal relaxation of gold in cadmium

Abstract

195,197mHg has been oriented at low temperature in a cadmium single crystal. From the orientation pattern of the 388 keV gamma ray VZZ (HgCd) =+1.82(25).1018 V/cm2 has been deduced. Using the dipole-relaxation mechanism on the gold isomeric state, the relaxation constant CK=0.044(5)Ks, the quadrupole interaction frequencies ΝQ(195m-AuCd)=+395(18) MHz, ΝQ(197m-AuCd)=+380(58) MHz and δ (E2/M1; 261 keV) < 0 are obtained from the orientation pattern of the 261 and 279 keV gamma rays. Using literature electric field gradient of gold in cadmium, Q(195m-Au,11/2)=(+) 1.41(1.0)b and Q(197m-Au,11/2)=(+)1.35(22)b can be deduced.