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Chin. Phys. B, 2016, Vol. 25(3): 033401    DOI: 10.1088/1674-1056/25/3/033401

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

Yipan Guo(郭义盼)1, 3, Zhihu Yang(杨治虎)1, Shubin Du(杜树斌)2, Hongwei Chang(常宏伟)2, Qingliang Xia(夏清良)2, Qiumei Xu(徐秋梅)1, 3
1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;
2. Department of Nuclear Physics, China Institute of Atomic Energy, Beijing 102413, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China
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:

Cite this article: 

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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