ISSN:
1434-601X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The productP K ω K of theK-capture probability and theK-fluorescence yieldω K was measured in the EC decay of 17.7 y145Pm and 60.14d125I by means ofK x-ray-γ-ray coincidences with semiconductor detectors. Accepting a best value ofω K =0.920 forZ=60 from the literature, values ofP K =0.606±0.025 and 0.554±0.025 for decay of145Pm to the 67.2 and 72.4 keV levels in145Nd, respectively, were determined, from which the application of EC theory givesQ EC=153±4 keV to the ground state. TheP K ω K ratio to the 67.2 and 72.4 keV levels also was determined independently to be 1.11±0.01, which serves as a good check on theγ-ray-gatedP K values. Theγ-ray energies were determined more accurately to be 72.4±0.1 and 67.2±0.1 keV, together with a ratio of their relative intensities,I 72.4/I 67.2=3.35±0.09. In the decay of125I, a value ofP K ω K =0.699±0.030 was measured, and by using an independent determination ofQ EC=178±2 keV to the ground-state from the literature, a value ofP K=0.801 is calculated from allowed EC theory, from whichω K =0.873±0.017 atZ=52 is obtained. This value is in good agreement with theoretical values and with a value of 0.875±0.028 predicted by the best fit curve of Bambyneket al.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01669463
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