Calorimetric low-temperature detectors for high resolution x-ray spectroscopy on stored highly stripped heavy ions
Calorimetric low-temperature detectors for high resolution x-ray spectroscopy on stored highly stripped heavy ions
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用于对存储的高度剥离重离子进行高分辨率 X 射线光谱分析的量热低温探测器
DOI：
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发表时间：
2002
期刊：
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通讯作者：
M. Weber
中科院分区：
文献类型：
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作者：
A. Bleile;P. Egelhof;S. Kraft;D. McCammon;H. Meier;A. Shrivastava;C. Stahle;M. Weber
精确测定类氢重离子中的兰姆位移提供了在非常强的库仑场中进行QED的灵敏测试，否则无法获得，并且也有可能推导出核电荷半径。本文简要介绍了在GSI达姆施塔特储存环ESR上进行的这类实验的现状。为了更准确地研究Au 78+或U 91+离子中的莱曼-α跃迁，目前正在开发一种用于硬X射线（E ~ 100 keV）的高分辨率量热低温探测器。 探测器模块由硅热敏电阻阵列和由高Z材料制成的X射线吸收器组成，以优化吸收效率。探测器被安置在一个专门设计的3 He/4 He稀释冰箱中，该冰箱适合ESR靶的几何形状。目前所达到的探测器性能已经接近满足兰姆位移实验的要求。对于60 keV x-1.5的原型探测器，获得了ΔEFWHM=75 eV的能量分辨率。
The precise determination of the Lamb shift in heavy hydrogen-like ions provides a sensitive test of QED in very strong Coulomb fields, not accessible otherwise, and has also the potential to deduce nuclear charge radii. A brief overview on the present status of such experiments, performed at the storage ring ESR at GSI Darmstadt, is given. For the investigation of the Lyman-α transitions in Au78+- or U91+- ions with improved accuracy a high resolving calorimetric low temperature detector for hard x-rays (E⩽100 keV) is presently developed. The detector modules consist of arrays of silicon thermistors and of x-ray absorbers made of high Z material to optimize the absorption efficiency. The detectors are housed in a specially designed 3He/4He dilution refrigerator which fits to the geometry of the ESR target. The detector performance presently achieved is already close to fulfill the demands of the Lamb shift experiment. For a prototype detector an energy resolution of ΔEFWHM=75 eV is obtained for 60 keV x-...