Lyman transitions of ${\mathrm{Xe}}^{53+*}$ produced by nonradiative electron capture in collisions of 95, 146, and 197 ${\mathrm{MeV/u}\mathrm{Xe}}^{54+}$ ions with Kr and Xe atoms have been studied experimentally. It shows that the captured electrons preferentially populate lower states. The intensity ratios $I\left(\mathrm{Ly}\text{−}\beta \right)/I\left(\mathrm{Ly}\text{−}\alpha \right)$ and $I\left(\mathrm{Ly}\text{−}\gamma \right)/I\left(\mathrm{Ly}\text{−}\alpha \right)$ are found to decrease with increasing projectile velocity, and the ratios for Xe decrease faster than those of Kr. The obtained results are compared with the relative cross sections calculated with the relativistic eikonal approximation. For both targets, the theoretical results overestimate the experimental ratio $I\left(\mathrm{Ly}\text{−}\beta \right)/I\left(\mathrm{Ly}\text{−}\alpha \right)$ but underestimate $I\left(\mathrm{Ly}\text{−}\gamma \right)/I\left(\mathrm{Ly}\text{−}\alpha \right).$ Moreover, the theory gives parallel decreasing curves for the two targets, which does not agree with the present experiment. In order to well understand the experimental findings, a more sophisticated theoretical approach is urgently required.

中文翻译：

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在 95–197−MeV/uXe54+ 与 Kr 和 Xe 碰撞中的状态选择性非辐射电子捕获

莱曼过渡 ${氙}^{53+*}$ 由非辐射电子捕获在 95、146 和 197 次碰撞中产生 ${\mathrm{百万伏特/u}氙}^{54+}$已经通过实验研究了具有 Kr 和 Xe 原子的离子。它表明捕获的电子优先填充较低的状态。强度比$\mathrm{一世}\left(李\text{-}\beta \right)/\mathrm{一世}\left(李\text{-}\alpha \right)$ 和 $\mathrm{一世}\left(李\text{-}\gamma \right)/\mathrm{一世}\left(李\text{-}\alpha \right)$发现随着弹丸速度的增加而降低，并且 Xe 的比率比 Kr 的比率下降得更快。将获得的结果与使用相对论特征近似计算的相对横截面进行比较。对于这两个目标，理论结果高估了实验比例$\mathrm{一世}\left(李\text{-}\beta \right)/\mathrm{一世}\left(李\text{-}\alpha \right)$ 但低估 $\mathrm{一世}\left(李\text{-}\gamma \right)/\mathrm{一世}\left(李\text{-}\alpha \right).$此外，该理论给出了两个目标的平行递减曲线，与本实验不符。为了更好地理解实验结果，迫切需要更复杂的理论方法。