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The K and L x-rays emitted in the decay of 23SNp have been studied with high resolution Ge(HP) and Si(Li) detectors in coincidence, in order to obtain the L 2 and L 3 subshell fluorescence and Coster-Kronig yields at Z=92. The results are: v2=0.630+0.036, 092=0.560__ 0.033, fz3=0.147_0.010, and o93=0.481_0.029. Results for the L 1 subshell were derived from singles spectra, by assuming a value of fx3 of 0.67, and are: v1=0.54+0.04, o91=0.21+__0.04, and f12<0.07. With the same assumption, the LI/K electron capture ratio and decay energy QEc for 23SNp were found to be 29.0__ 3.6 and 123.6__+ 0.7 keV, respectively. Relative L x-ray intensities for Z= 92 also were measured and are compared with the theory of Scofield and with recent diffraction experiments. Electron ejection from the L shell during 235Np decay has been studied by L x-ray--L x-ray coincidences and found to occur with a probability of (1.3 _ 1.0) • 10 -4 per disintegration.

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