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Title: Electromagnetic interactions of high energy cosmic ray muons
Author: Coats, R. B.
ISNI:       0000 0004 2749 8267
Awarding Body: Durham University
Current Institution: Durham University
Date of Award: 1967
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Electromagnetic interactions of high energy muons incident in the nearly horizontal direction at Durham, I98 ft. above sea level, have been studied by detecting electron-photon bursts produced in iron absorbers. Over the measured burst size range, bremsstrahlung and knock-on electron production were the predominant energy transfer processes. No divergence from accepted theory has been observed for energy transfer in the range 3 - 240 GeV. A second burst experiment has been performed to measure the spectra of nuclear-active particles incident at Durham in the nearly vertical direction. The observed spectra of both charged and neutral nuclear-active particles show a discontinuity at energies >100 GeV, which can be taken as support for the SU(_3) prediction that a protonis a tightly bound system of three charged quarks. This interpretation would indicate a quark mass of 10 GeV, and that high energy protons dissociate into their constituent quarks in about l8^ of their collisions above threshold (18OO GeV). A further implication isthat quarks interact strongly in the atmosphere, otherwise telescope detectors would have recorded an abundance of quarks. A decrease-2in the nucleon attenuation length from 127 gm. cm to a value ofp117 gm. cm(^-2) for sea level nucleon energies > 100 GeV would also account for the observed discontinuity.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available