Preliminary study on characteristic X-ray yields of the thick-targe impacted by low-energy positron

Abstract

BackgroundX-ray emission from solid samples exposed to positron beams in the low-energy region is the basis of some material analysis techniques.PurposeThis study aims to measure the K-shell characteristic X-ray yields of Ti (Z=22) target collided by 10~30 keV positrons preliminarily.MethodsBased on the thick-target method, the Si-PIN detector with ultra-thin sensitive layer was adopted to detect the X-rays, and the positron intensity was determined through the 511 keV γ photon counts detected by the HPGe detector. The experimental data were compared with the PENELOPE simulations software which was based on the Distorted-Wave Born Approximation (DWBA) theory.ResultsThe results indicate that the shape of the characteristic X-ray yield curves is consistent in the considered energy regions, but the experimental data are obviously lower than those of the simulation, especially in the lower energy (≦15 keV).ConclusionsThe experimental method adopted in this paper is applicable, providing a reference for the future work.

Keywords

• positron
• x-ray yields
• thick-target
• penelope simulation