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Observations of the Nuclear Interactions of a 315 MeV Bremsstrahlung -ray Beam

1956; IOP Publishing; Volume: 69; Issue: 2 Linguagem: Inglês

10.1088/0370-1298/69/2/304

1747-3829

E. P. GEORGE,

High-Energy Particle Collisions Research

The γ-ray beam was incident normally on Ilford G5 nuclear research emulsions, and events occurring in the emulsion were studied. The events have been analysed, and particular attention paid to interactions in which charged mesons leave tracks of length greater than 1.5 mm at right angles to the γ-ray beam. About 50% of the observed photo-mesons are not accompanied by visible nuclear disintegration `stars'. The energy spectrum of the emulsion photo-mesons has been measured. The ratio of stars to mesons is found to be 11.4:1. These results are all consistent with a theoretical model proposed by Butler, in which meson production is considered to take place preferentially on the surface of atomic nuclei. Several high-energy electrons and electron-pairs moving at right angles to the γ-ray beam have been observed, and are accounted for.