Precise Determination of the Lyman-$$alpha $$α1 Transition Energy in Hydrogen-like Gold Ions with Microcalorimeters
Precise Determination of the Lyman-$$alpha $$α1 Transition Energy in Hydrogen-like Gold Ions with Microcalorimeters
复制标题
用微热量计精确测定类氢金离子中的莱曼-$$alpha $$α1 跃迁能
DOI：
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
P. Scholz
中科院分区：
文献类型：
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作者：
S. Kraft;V. Andrianov;A. Bleile;A. Echler;P. Egelhof;P. Grabitz;C. Kilbourne;O. Kiselev;D. McCammon;P. Scholz
类氢重离子中莱曼-α-α1谱线跃迁能的精确测定为在非常强的库仑场中提供了一种灵敏的量子电动力学测试。报道了用微量热计测定金离子(Au+78+)在实验储存环上的Lyman-αα1跃迁能.探测到了125 MeV/u Au~(79+)离子与Ar气体喷射靶相互作用产生的X射线。探测器阵列由14个像素组成，带有硅热敏电阻和锡吸收体，在实验室中获得了50 eV的能量分辨率，X射线能量为59.5keV。为实验室帧中的每个像素确定莱曼-$$阿尔法$$α1转换能量，然后将其转换到发射器帧并求平均值。能量校准使用Dy-159源。准确校正多普勒频移所需的探测器像素的绝对位置是通过地形测量和扫描经过低温恒温器窗口的准直AM-241源来确定的。在发射极框架中，Lyman-$$α$$α1谱线的能量为$$E(Ly-α1，Au^{+78})=(71563 Pm4_{Stat}Pm7_{syst})$$E(Ly-α1，Au+78)=(71563±4stat±7syst)eV，与理论预测一致。系统误差主要由低温恒温器相对于束靶相互作用区位置的不确定度决定。
The precise determination of the transition energy of the Lyman-$$alpha $$α1 line in hydrogen-like heavy ions provides a sensitive test of quantum electrodynamics in very strong Coulomb fields. We report the determination of the Lyman-$$alpha $$α1 transition energy of gold ions (Au$$^{78+}$$78+) with microcalorimeters at the experimental storage ring at GSI. X-rays produced by the interaction of 125 MeV/u Au$$^{79+}$$79+ ions with an internal argon gas-jet target were detected. The detector array consisted of 14 pixels with silicon thermistors and Sn absorbers, for which an energy resolution of 50 eV for an X-ray energy of 59.5 keV was obtained in the laboratory. The Lyman-$$alpha $$α1 transition energy was determined for each pixel in the laboratory frame, then transformed into the emitter frame and averaged. A Dy-159 source was used for energy calibration. The absolute positions of the detector pixels, which are needed for an accurate correction of the Doppler shift, were determined by topographic measurements and by scanning a collimated Am-241 source across the cryostat window. The energy of the Lyman-$$alpha $$α1 line in the emitter frame is $$E(Ly-alpha 1,Au^{+78})=(71563 pm 4_{stat} pm 7_{syst})$$E(Ly-α1,Au+78)=(71563±4stat±7syst) eV, in good agreement with theoretical predictions. The systematic error is dominated by the uncertainty in the position of the cryostat relative to the interaction region of beam and target.
用于捕获高电荷重离子 X 射线光谱的量热低温探测器
影响因子：
2
作者：
S. Kraft-Bermuth
通讯作者：
S. Kraft-Bermuth