Abstract
The mono-energetic positon emission of the 1409 keV El transition in 152Sm has been measured using a Siegbahn-Slätis intermediate-image spectrometer. By comparing the intensity of the positon peak with that of the internal conversion line of the same transition the branching ratio for this process has been determined as (2.5±1.0) × 10 −7 positon per gamma transition, in reasonable agreement with that reported by Perdrisat et al. The mean life of the 1531 keV level of 152Sm has been estimated to be τ = 5.7 × 10 −15 sec. From our experimental value and relative transition intensities it is found that the 1409 keV El transition is retarded, when compared with the single proton transition probability, by a factor of at least about 60.
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