CII. Large angle scattering of μ-mesons in lead

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Abstract
A multiplate cloud chamber, operated underground, has been used to investigate the scattering of μ-mesons in lead over a wide range of meson energies. The large angle ‘tails’ of the measured distributions have been compared with those expected from Molière's theory for a ‘point’ nucleus and Olbert's modification of this theory for a ‘solid’ nucleus. At energies of a few hundred mev the method used is not capable of distinguishing between these two theories but at higher energies the measured distributions fall very near to those expected from Molière's theory. No explanation of these departures from the expected distributions for a ‘solid’ nucleus is offered, but they are in agreement with those found by other workers. It is pointed out that such departures may be due to deficiencies in the theory and do not necessarily indicate a non-Coulomb interaction between fast μ-mesons and nucleons.

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