L-subshell fluorescence and coster-kronig yields atZ=92 and the decay of235Np

Abstract

TheK andL x-rays emitted in the decay of235Np have been studied with high resolution Ge(HP) and Si(Li) detectors in coincidence, in order to obtain theL2 andL3 subshell fluorescence and Coster-Kronig yields atZ=92. The results are:v2=0.630±0.036, ω2=0.560±0.033,f23=0.147±0.010, and ω3=0.481±0.029. Results for theL1 subshell were derived from singles spectra, by assuming a value off13 of 0.67, and are:v1=0.54±0.04, ω1=0.21±0.04, andf12<0.07. With the same assumption, theL1/K electron capture ratio and decay energyQ ec for235Np were found to be 29.0±3.6 and 123.6±0.7 keV, respectively. RelativeL x-ray intensities forZ=92 also were measured and are compared with the theory of Scofield and with recent diffraction experiments. Electron ejection from theL shell during235Np decay has been studied byL x-ray-L x-ray coincidences and found to occur with a probability of (1.3±1.0) × 10−4 per disintegration.