Abstract
The anisotropies of the 177, 326, and 503 keV γ-transitions between negative parity states of 131Xe have been remeasured in the decay of oriented 131I nuclei. In addition the linear polarization of the 503 keV radiation has been determined with a Compton polarimeter consisting of two Ge(Li) detectors. A combined analysis of the reported experiment and earlier internal conversion and angular distribution data yields the unique assignments 92−and72− for the levels at 341 and 667 keV. The E2M1 mixing ratios of the 177 and 326 keV transitions are δ(177) = −4.5 ± 1.5 and δ(326) = −4.4 ± 1.6. The intensity of the L = 2 component in the first forbidden β-decay to the 667 keV level is at most 60 %.
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