Production of projectile and target K-vacancy in near-symmetric collisions of 60-100 MeV Cu9+ ions with thin Zn target

doi:10.1088/1674-1056/25/3/033401

Abstract We report studies on both target and projectile K-shell ionization by collisions of Cu⁹⁺ ions on the thin Zn target in the energy range of 60-100 MeV. In this work, the relative ratio for the production of the target to projectile K-vacancy is measured. The result shows that it almost remains stable over this energy range and has good consistency with the predictions by vacancy transfer via the 2pσ-1sσ rotational coupling, which gives experimental evidence for K-vacancy sharing between two partners. Furthermore, the discussion for comparisons between the experimental ionization cross sections and the possible theoretical estimations is presented. These comparisons suggest that the experimental data agree well with those predicted by the Binary-Encounter approximation (BEA) model but are not in good agreement with the modified BEA calculations. It allows us to infer that the direct ionization (and/or excitation) is of importance to initial K-vacancy production before 2pσ-1sσ transitions in the present collision condition.

Keywords: vacancy sharing ionization cross sections Binary-Encounter approximation model

Received: 10 August 2015
Revised: 02 November 2015
Accepted manuscript online:

PACS:	34.50.Fa	(Electronic excitation and ionization of atoms (including beam-foil excitation and ionization))
	34.80.Dp	(Atomic excitation and ionization)

Fund: Project supported by the Joint Funds of the National Natural Science Foundation of China (Grant No. U1332122).

Corresponding Authors: Zhihu Yang
E-mail: z.yang@impcas.ac.cn

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Yipan Guo(郭义盼), Zhihu Yang(杨治虎), Shubin Du(杜树斌), Hongwei Chang(常宏伟), Qingliang Xia(夏清良), Qiumei Xu(徐秋梅) Production of projectile and target K-vacancy in near-symmetric collisions of 60-100 MeV Cu⁹⁺ ions with thin Zn target 2016 Chin. Phys. B 25 033401

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Production of projectile and target K-vacancy in near-symmetric collisions of 60-100 MeV Cu9+ ions with thin Zn target

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Production of projectile and target K-vacancy in near-symmetric collisions of 60-100 MeV Cu⁹⁺ ions with thin Zn target