1981 Volume 50 Issue 5 Pages 1432-1439
Measurements of gamma-gamma angular correlations in 151Sm following the decay of 151Pm have been made. A dual parameter (4096 ch.×4096 ch.) coincidence method with two Ge(Li) detectors was used. Multipole mixing ratios (E2/M1) of 17 gamma rays were deduced. Among them, six mixing ratios were determined for the first time. The parity of the 663.4 keV and 773.8 keV levels was assigned to be negative. Experimental large absolute values of E2/M1 mixing ratios of δ349.8=2.46±0.911.43, δ597.7=−4.30±19.42.74, δ636.1=−3.41±0.320.29 and δ669.2=−69.3±∞58.9 agree with a calculation which takes vibrational components into account.
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