CXVIII. A cloud chamber study of the interactions of fast μ-mesons

Abstract
A cloud chamber operating in a magnetic field has been used to investigate the production of penetrating secondaries by μ-mesons at sea level. No definite events in which single penetrating secondaries are produced (APP) have been observed. Some possible explanations for the high cross sections for production of APP found by earlier workers are discussed. Events in the cloud chamber attributed to the nuclear interaction of μ-mesons can be explained in terms of the virtual photon interaction postulated by George and Evans (1950).

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