Abstract
Using a thoroughly tested Siegbahn-Slätis intermediate-image spectrometer, the shape factor of the 961 keV beta transition was measured and found to be 1− (0.031±0.006) W. This result is based on the Fermi function by Dzhelepov and Zyrianova. The end-point energy is 961.0±1.2 keV. By comparing the area under the K conversion line of the 412 keV transition in 198Hg to that under the continuous spectrum, the K conversion coefficient was determined to be (299±2)×10 −4, in very good agreement with the theoretical value for a E2 transition.
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