Measurement of Differential And Total M Shell X-Ray Production Cross-Section in Thorium And Uranium

Measurement of differential M shell x-ray production cross sections for thorium and uranium elements at different angles has been reported. The measurements were performed using a 55Fe source and a Si(Li) detector. The present results contradict the predictions of Cooper and Zare that, after photoionization of inner shells, the vacancy state has equal population of magnetic substates and the subsequent x-ray emission is isotropic, but confirm the predictions of the calculations of Flugge et al. The differential M shell x-ray production cross sections can be fitted to a second order polynomial as a function of cos θ. Total M x-ray production cross sections have been derived using fitting coefficients