8-9.5 keV正电子致Ti的K壳层电离截面的实验研究

doi:10.7498/aps.67.20180666

	8-9.5 keV正电子致Ti的K壳层电离截面的实验研究
	Qian, Yu-Rui; Wu, Ying; Yang, Xia-Tong; Chen, Qiu-Xiang; You, Jun-Dong; Wang, Bao-Yi; Kuang, Peng; Zhang, Peng; 王宝义; 况鹏
刊名	物理学报
	2018
卷号	67 期号:19 页码:192101
关键词	positron collisions purely thick Ti target Ti K shell ionization Monte Carlo simulation distorted-wave Born approximation model
ISSN号	1000-3290
DOI	10.7498/aps.67.20180666
其他题名	Experimental study on Ti K shell ionization cross sections induced by 8-9.5 keV positrons
文献子类	Article
英文摘要	Due to lack of experimental data of the inner shell ionization cross sections induced by low-energy positron, advanced theoretical models developed in recent years cannot be correctly evaluated, and the application of slow positron beam technique is greatly limited. Here we present the method of obtaining reliable experiment data of atomic inner-shell ionization cross section by positron impact. In this work, the slow positron beam device is used to generate 8-9.5 keV positron beams impacting on a pure thick Ti target, and the silicon drift detector (SDD) is adopted to collect the X-ray spectra produced by positrons impacting on thick Ti target, and the incident positron numbers are obtained by applying an HP Ge detector to on-line collect annihilation photons. Then the experimental characteristic X-ray yields of Ti K shell impacted by 8-9.5 keV positron could be acquired. Meantime, the simulated characteristic X-ray yields are acquired by the PENELOPE program simulating the experiments. In the comparison between the experimental yields and the simulated yields based on two sets of different inner shell ionization cross section database in the PENELOPE code, i.e. the optical data model (ODM) and the distorted-wave Born approximation model (DWBA), there is a large difference between the simulated data from the ODM theoretical model and the experimental values, while the simulated yields from the DWBA theoretical model are in good agreement with the experimental results. Accordingly, a correction factor is introduced to modify the DWBA theoretical model database which is used in the PENELOPE, and then the experimental process is re-simulated. When the simulated yields and the experimental yields are in the highest consistence, the reliable Ti K shell ionization cross sections impacted by 8-9.5 keV positron could be obtained. The biggest advantage of using this method to obtain atomic inner-shell ionization cross section impacted by positron is that the effects of the multiple scattering of incident positrons in the thick target, from the bremsstrahlung and annihilation photons, and other secondary particles on the experimental characteristic X-rays do not need calculating (the calculation method that has been developed previously cannot give the more correct result about the contribution of the multiple scattering of incident positrons, from the bremsstrahlung and annihilation photons, and other secondary particles to characteristic X-rays).
WOS关键词	ELECTRON-IMPACT ; SIMULATION ; AG
WOS研究方向	Physics
语种	中文
CSCD记录号	CSCD:6338970
WOS记录号	WOS:000448517700009
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/286991]
专题	高能物理研究所_多学科研究中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Qian, Yu-Rui,Wu, Ying,Yang, Xia-Tong,等. 8-9.5 keV正电子致Ti的K壳层电离截面的实验研究[J]. 物理学报,2018,67(19):192101.
APA	Qian, Yu-Rui.,Wu, Ying.,Yang, Xia-Tong.,Chen, Qiu-Xiang.,You, Jun-Dong.,...&张鹏.(2018).8-9.5 keV正电子致Ti的K壳层电离截面的实验研究.物理学报,67(19),192101.
MLA	Qian, Yu-Rui,et al."8-9.5 keV正电子致Ti的K壳层电离截面的实验研究".物理学报 67.19(2018):192101.