Precise Lamb Shift Measurements in Hydrogen‐Like Heavy Ions—Status and Perspectives
Precise Lamb Shift Measurements in Hydrogen‐Like Heavy Ions—Status and Perspectives
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类氢重离子的精确兰姆位移测量——现状和前景
DOI：
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发表时间：
2009
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通讯作者：
M. Trassinelli
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文献类型：
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作者：
V. Andrianov;K. Beckert;A. Bleile;C. Chatterjee;A. Echler;P. Egelhof;A. Gumberidze;S. Ilieva;O. Kiselev;C. Kilbourne;H. Kluge;S. Kraft;D. McCammon;J. Meier;R. Reuschl;T. Stöhlker;M. Trassinelli
类氢重离子中莱曼α1和α2线能量的精确测定，提供了在非常强的库仑场中对量子电动力学的灵敏测试。在GSI的实验储存环（ESR）上，首次将量热低温探测器应用于实验中，精确测定了铅离子207 pb 81+的莱曼谱线的跃迁能。探测器由NASA/戈达德航天飞行中心提供的硅整流器和Pb或Sn吸收器组成，以在40-80 keV的能量范围内获得高量子效率，多普勒频移莱曼线位于该能量范围内。测得的莱曼α1线的能量E（Ly-α1，207 Pb 81+）=（77937± 12 stat ± 23 syst）eV与理论预测在误差范围内一致。系统误差主要是由于探测器的非线性能量校准以及探测器和气体射流目标的相对位置的不确定性。
The precise determination of the energy of the Lyman α1 and α2 lines in hydrogen‐like heavy ions provides a sensitive test of quantum electrodynamics in very strong Coulomb fields. For the first time, a calorimetric low‐temperature detector was applied in an experiment to precisely determine the transition energy of the Lyman lines of lead ions 207pb81+ at the Experimental Storage Ring (ESR) at GSI. The detectors consist of silicon thermistors, provided by the NASA/Goddard Space Flight Center, and Pb or Sn absorbers to obtain high quantum efficiency in the energy range of 40–80 keV, where the Doppler‐shifted Lyman lines are located. The measured energy of the Lyman α1 line, E(Ly‐α1, 207Pb81+) = (77937±12stat±23syst) eV, agrees within errors with theoretical predictions. The systematic error is mainly due to uncertainties in the non‐linear energy calibration of the detectors as well as the relative position of detector and gas‐jet target.