Measurements of K-shell ionization cross sections of 35Br, 37Rb, 39Y using low energy protons

K-shell ionization cross section measurements are reported for 35Br, 37Rb and 39Y targets caused by protons over 300-400 keV energy range in 20 keV increment. The K-shell ionization cross sections (σK1) at different energies were deduced from the Kα and Kβ X-ray production cross sections which were obtained from X-ray yields of the Kα and Kβ transitions. The experimental values are compared with the calculated values of ECPSSR theory and empirical reference cross sections. The resultant K-shell ionization cross sections are found to be in reasonable agreement with the ECPSSR theory. The Kα/Kβ intensity ratios are also presented and compared with other experimental values and also with the theoretical one-hole values given by Scofield. (author). 27 refs., 4 tabs., 2 figs