Determination of the fine-structure constant by a precise measurement of h/mn: the final result
Determination of the fine-structure constant by a precise measurement of h/mn: the final result
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通过精确测量 h/mn 确定精细结构常数：最终结果
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
W Weirauch
中科院分区：
文献类型：
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作者：
E Krüger;W Nistler;W Weirauch
在法国格勒诺布尔的Laue-Langevin研究所的高通量反应堆中，一束具有已知波长的中子在完美的硅晶体中通过布拉格反射产生；这些中子的速度是用一种非常精确的飞行时间法测量的。根据德布罗意方程，波长与速度的乘积等于h/mn （h普朗克常数，mn中子质量）。由这种方法确定的h/mn的值，导出了精细结构常数无穷大的值。第一批测量结果已经公布。第二轮调查的结果现已公布。它们与以前的结果非常吻合。两个系列实验数据的最终值分别为h/mn = 3.956 033 332 （290） × 10-7 m2 s-1（相对不确定度为7.34 × 10-8）和α-1 = 137.036 010 62(5 03)（相对不确定度为3.67 × 10-8），不确定度为一标准差估计。
At the high-flux reactor of the Institut Laue-Langevin in Grenoble (France), a beam of neutrons with a well-known wavelength was produced by Bragg reflection in a perfect silicon crystal; the velocity of these neutrons was measured using a very precise time-of-flight method. According to the de Broglie equation, the product of the wavelength and the velocity is equal to h/mn ( h Planck constant, mn neutron mass). From the value of h/mn determined in this way the value of the fine-structure constant infinity was derived. The results of a first series of measurements have already been published. The results of a second series are now available. They are in excellent agreement with the previous results. The final values following from all the experimental data of both series are h/mn = 3.956 033 332 (290) × 10-7 m2 s-1 (relative uncertainty 7.34 × 10-8) and α-1 = 137.036 010 62 (5 03) (relative uncertainty 3.67 × 10-8), the uncertainties being one-standard-deviation estimates.