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- W2037464554 abstract "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." @default.
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- W2037464554 date "1998-06-01" @default.
- W2037464554 modified "2023-10-16" @default.
- W2037464554 title "Determination of the fine-structure constant by a precise measurement of<i>h</i>/<i>m</i><sub>n</sub>: the final result" @default.
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- W2037464554 doi "https://doi.org/10.1088/0026-1394/35/3/9" @default.
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