Letter | Published:

Single Scattering of Fast β-Particles by Protons

Nature volume 158, page 753 (23 November 1946) | Download Citation



WE have recently taken some eight hundred pairs of photographs corresponding to about 124 metres of track of β-particles, of energies from 0.5 to 1.1 mV., in a mixture of 80 per cent hydrogen and 20 per cent oxygen, contained in an expansion chamber. Assuming that the scattering of the β-particles in oxygen is similar to that of the adjacent element nitrogen, for which results have already been obtained1, the elastic scattering of these β-particles through angles greater than 20° by protons is found to be in agreement with Mott's theory. The theory predicted that about one such deflexion was to be expected; actually two cases were observed. The statistical fluctuations were therefore large, but it may be inferred that there is no serious discrepancy between existing theory and experiment for the collisions of protons and electrons of this energy.

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  1. 1.

    , Proc. Roy. Soc., A, 153, 383 (1936).

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  1. King's College, London, W.C.2. Oct. 30.

    • R. R. RAY
    •  & F. C. CHAMPION


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