Radiative electron capture studied in relativistic heavy-ion-atom collisions.
Radiative electron capture studied in relativistic heavy-ion-atom collisions.
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DOI：
10.1103/physreva.51.2098
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发表时间：
1995-03
期刊：
影响因子：
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通讯作者：
Stöhlker;Kozhuharov;Mokler;Warczak;Bosch;Geissel;Moshammer;Scheidenberger;Eichler;Ichihara;Shirai;Stachura;Rymuza
中科院分区：
文献类型：
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作者：
Stöhlker;Kozhuharov;Mokler;Warczak;Bosch;Geissel;Moshammer;Scheidenberger;Eichler;Ichihara;Shirai;Stachura;Rymuza
本文从实验和理论两方面研究了高能离子与低高能气体和固体目标碰撞时的辐射电子俘获过程。对观测到的x射线光谱进行了光子角分布和总K -REC截面的分析。角微分截面的实验结果可以通过精确的相对论计算很好地再现，这与标准sin[sup 2][theta]分布有很大的偏差。[ital K]-REC的总横截面遵循从精确的相对论性计算以及从非相对论性偶极子近似获得的简单标度规则。这些不同的理论方法之间的一致必须被看作是偶然的，但它为在实际目的中使用非相对论方法提供了支持。
The process of radiative electron capture (REC) in relativistic collisions of high-[ital Z] ions with low-[ital Z] gaseous and solid targets is studied experimentally and theoretically. The observed x-ray spectra are analyzed with respect to photon angular distributions as well as to total [ital K]-REC cross sections. The experimental results for angle-differential cross sections are well reproduced by exact relativistic calculations which yield significant deviations from standard sin[sup 2][theta] distributions. Total cross sections for [ital K]-REC are shown to follow a simple scaling rule obtained from exact relativistic calculations as well as from a nonrelativistic dipole approximation. The agreement between these different theoretical approaches must be regarded as fortuitous, but it lends support to the use of the nonrelativistic approach for practical purposes.