Atomic collisions with relativistic heavy ions. III. Electron capture.
Atomic collisions with relativistic heavy ions. III. Electron capture.
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原子与相对论性重离子的碰撞。
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
Wegner
中科院分区：
文献类型：
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作者：
Meyerhof;Anholt;Eichler;Gould;Munger;Alonso;Thieberger;Wegner
测量了82-、140-和200-MeV/amu Xe/sup 54 +/、Xe/sup 53 +/和Xe/sup 52 +/离子入射到从Be到Au的薄固体靶上的电子捕获截面。测量结果与辐射捕获和非辐射捕获的计算结果进行了比较。非辐射捕获计算基于相对论的斜角近似，包括从目标的K、L和M壳到几乎所有弹壳的跃迁。在高z目标中，非辐射捕获到弹体激发态占主导地位，这是由斜角计算预测的，并通过比较裸Xe/sup 54 +/和Xe/sup 52 +/ (1s/sup 2/)弹体的实测截面得到证实。推导了一个用于相对论加速器设计和其他应用的非辐射电子捕获截面估计的简单公式。在低速高z碰撞中也观察到双重和三重电子捕获。
Cross sections for the electron capture by 82- , 140- , and 200-MeV/amu Xe/sup 54 +/, Xe/sup 53 +/, and Xe/sup 52 +/ ions incident on thin solid targets from Be to Au were measured. The measurements are compared with calculations of radiative and nonradiative capture. The nonradiative capture calculations are based on the relativistic eikonal approximation which includes transitions from K, L, and M shells of the target to nearly all projectile shells. In high-Z targets, nonradiative capture into excited states of the projectile is dominant, as predicted by the eikonal calculations and confirmed by comparing measured cross sections for bare Xe/sup 54 +/ and Xe/sup 52 +/ (1s/sup 2/) projectiles. A simple formula for estimating nonradiative-electron-capture cross sections for relativistic-ion accelerator design and other applications is derived. Double and triple electron capture are also observed in the low-velocity, high-Z collisions.