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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Four-body treatment of the single-electron capture in energetic proton-helium collisions
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Four-body treatment of the single-electron capture in energetic proton-helium collisions

机译：高能质子-氦碰撞中单电子俘获的四体处理

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摘要

Both the post and prior versions of the four-body Coulomb-Born distorted wave (CBDW-4B) approximation are applied to calculate the single-electron capture differential and integral cross sections in collision of the fast protons with helium atoms. The outlined model satisfies the correct boundary conditions, and the incident energy is considered in a range of 20 to 1000 keV for which the applied approach is valid. For proton-helium collisions, the CBDW-4B method exactly coincides with the four-body first-order Jackson-Schiff approximation (JS1-4B). The influence of the static and dynamic electronic correlations on the cross sections is investigated. The ground state of the helium atom is described using two different wave functions to show the influence of the static correlation on the captured cross sections. In order to illustrate the validity of the present method, the obtained results are compared with the other theoretical investigations as well as the available experimental measurements. Although the overall agreement of the present numerical differential cross sections (DCS) with the reported experimental findings is acceptable, contrary to our general expectation, the three-body version of the formalism gives a better description of the angular distribution of the captured cross sections. However, for integral cross sections, the agreement of the four-body results with the reported measurements is better than those of three-body formalism.
机译：四体库仑-伯恩畸变波（CBDW-4B）近似的后版本和先前版本均用于计算快速质子与氦原子碰撞中的单电子俘获微分和积分截面。概述的模型满足正确的边界条件，并且认为入射能量在20到1000 keV的范围内，对于该能量适用的方法是有效的。对于质子氦碰撞，CBDW-4B方法与四体一阶Jackson-Schiff逼近（JS1-4B）完全重合。研究了静态和动态电子相关对横截面的影响。使用两个不同的波函数描述了氦原子的基态，以显示静态相关性对捕获截面的影响。为了说明本方法的有效性，将获得的结果与其他理论研究以及可用的实验测量结果进行了比较。尽管目前的数值微分横截面（DCS）与所报告的实验结果的总体一致性是可以接受的，但与我们的普遍期望相反，三体形式的形式主义对捕获的横截面的角度分布给出了更好的描述。但是，对于整体横截面，四体结果与报告的测量结果的一致性要好于三体形式主义。

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