
doi: 10.1007/bf01398069
TheK-electron capture probability,PK, in the allowed and non-unique first-forbidden transitions is measured by observing coincidences betweenK x rays and γ rays. The following results are obtained. In Gd151 decayPK to the 349.8 keV level is 0.713 ± 0.015 andPK to the 307.4 keV level is 0.813 ± 0.020. It is also deduced that the decay energyQEC is 491−9+14 keV and the spin of the 307.4 keV level is 7/2. In Dy159 decayPK to the 58.0 keV level is found to be 0.803 ± 0.032.
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