Determination of theE2M1Multipole Mixing Ratios of the Gamma Transitions inCd110

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Abstract
The multipole character and E2M1 mixing ratios of all γ transitions following the decay of Ag110m to Cd110 have been determined by measuring the 1-2, 1-3, and 1-4 directional correlations, using two 30-cc coaxial Ge(Li) detectors in conjunction with a multichannel coincidence gating system. The analysis of the data clearly demonstrated the necessity for careful investigations of the effects of the Compton background on directional correlation measurements using Ge(Li) detectors. The directional correlation functions for mixed γ−γ cascades are given in terms of explicitly defined reduced matrix elements and their ratios δ(γn). The analysis of the 25 measured directional correlations yielded a consistent set of E2M1 mixing ratios for all mixed multipole transitions. The E2M1 amplitude ratios δ(γn)=〈In+1∥j→NA→2E∥In〉〈In+1∥j→NA→1M∥IN〉 for the Cd110 γ rays are (energies are in keV): δ(447)=−0.45±0.20, δ(620)=−0.80±0.50, δ(678)=−0.25±0.20, δ(687)=−1.1−0.4+0.8, δ(707)=−1.0±0.3, δ(818)=−1.20±0.15, δ(1384)=−0.37±0.03, and δ(1505)=−0.55±0.10. In terms of the multipole moments 〈In+1∥M(πL)∥In〉 of Bohr and Mottelson, the E2M1 moment ratios