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On the Scattering of Slow Mesons
Phys. Rev. 68, 153 – Published 1 October, 1945
DOI: https://doi.org/10.1103/PhysRev.68.153
Abstract
Photographs of mesons of total energy lying between 1.55× and 2.55× ev have been obtained by a special arrangement of counters controlling the expansion of the cloud chamber. The scattering of these particles, both multiple and single, has been studied in two thicknesses of lead (2 cm and 4 cm). It is found that though the law of Williams holds good for the average angle of scattering, its absolute value is only about 50 percent of the theoretical value expected from William's formula. The Gaussian distribution of the number of particles with angle of scattering is found to be approximately true. A cross section for the non-Coulombian nuclear scattering has been calculated. The value of this is found to be 1.84× per nucleon for mesons of mean total energy 2× ev. This agrees satisfactorily with that calculated by Bhabha and Weinberg and Ma for transversely polarized mesons of this energy, but does not agree with that found experimentally by Shutt and Code. Our value is about twenty-five times the value obtained by Shutt. The too low value of Shutt and others may be attributed to the presence of high energy mesons (for which the nuclear scattering cross section is very small) in large numbers so as to mask the effect of low energy mesons. One case of a high energy proton being singly scattered has also been obtained.
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Omitted endnote