Abstract
The L 1 subshell orbital electron capture probability P L1 in the decay of 33.4 y 207Bi to the 2339.89 keV level in 207Pb is measured to be 0.518 ± 0.081 (95% confidence) by a new method in which L 1 subshell characteristic X-rays in the L γ X-ray peak are observed in an X γt coincidence mode with 1770.23 keV γ-rays. The value of P L2 is 0.047 ± 0.015 (95% confidence). From these results a value of Q EC = 39 -8 +21 keV is obtained for capture transitions to the 2339.89 keV level. The absence of K-capture to this level also is established by absence of K X-rays in coincidence with 1770.23 keV γ-rays.
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