Contribution of CK Transfer to Proton induced L Subshell X-Ray Production Cross-Sections for Direct and Indirect Vacancies

Abstract

The contribution of CK transfer to the proton induced L subshell X-ray production cross-sections due to both direct and indirect vacancies has been determined for the elements Pb & Th at incident proton energies ranging from 1 MeV to 10 MeV. The contribution for direct vacancies (without K to L transfer) was estimated by calculating the X-ray production cross-sections in absence of CK transfer, while for indirect vacancies, it was assumed that the L subshell X-rays were emitted only due to vacancies transferred from K to Li subshells. It has been observed that for X-rays resulting from direct vacancies, the contribution of CK transfer initially decreases with increase in energy and thereafter increases in both the cases. This contribution has been found to be up to 20% & 17% in Pb and Th respectively for Ll & Lα X-ray groups. In case of X-rays from indirect vacancies, there was no regular trend at lower energies and thereafter the contribution becomes almost constant.