类氢$^{142}$ Pm离子调制电子俘获衰变的新实验：Pm指数衰变的精确测量
New Test of Modulated Electron Capture Decay of Hydrogen-Like $^{142}$Pm Ions: Precision Measurement of Purely Exponential Decay
摘要：
在GSI实验储存环（ESR）上进行了类氢$^{142}$ Pm $^{60+}$离子的电子俘获（EC）衰变实验。衰减似乎是纯指数的，没有观察到调制。约9000个人EC衰变的衰变时间已被测量通过应用单离子衰变光谱方法。目视和自动分析数据均可通过单指数衰减来描述，自动分析的衰减常数为0.0126（7）s $^{-1}$，手动分析的衰减常数为0.0141（7）s $^{-1}$。如果假设调制叠加在指数衰减曲线上，则最佳拟合给出的调制幅度仅为0.019（15），这与零相容，并且比原始观测结果的幅度0.23（4）小4.9个标准差。
英文摘要：
An experiment addressing electron capture (EC) decay of hydrogen-like $^{142}$Pm$^{60+}$ ions has been conducted at the experimental storage ring (ESR) at GSI. The decay appears to be purely exponential and no modulations were observed. Decay times for about 9000 individual EC decays have been measured by applying the single-ion decay spectroscopy method. Both visually and automatically analysed data can be described by a single exponential decay with decay constants of 0.0126(7) s$^{-1}$ for automatic analysis and 0.0141(7) s$^{-1}$ for manual analysis. If a modulation superimposed on the exponential decay curve is assumed, the best fit gives a modulation amplitude of merely 0.019(15), which is compatible with zero and by 4.9 standard deviations smaller than in the original observation which had an amplitude of 0.23(4).
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