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Durham e-Theses
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The separation of the particle and light fronts in cosmic ray showers at mountain altitudes

Stephenson, I. (1981) The separation of the particle and light fronts in cosmic ray showers at mountain altitudes. Masters thesis, Durham University.



This Thesis describes a study of the time separation of the Cerenkov light and particle fronts in large (10(^16) - 10(^18) eV) cosmic ray air showers at an atmospheric depth of 862 g cm(^-2). The work formed only part of a much larger experiment conducted at the Dugway Proving Ground, Utah, U.S.A. during the autumn and winter months of 1977/8, 1978/79, 1979/80. The aim of this particular work is to refine our understanding of the time delay between the Cerenkov light and the particle fronts, and to establish this time as a depth of maximum sensitive measure. Since this is a prime indicator of the mass of the initiating primary, the time delay which can be readily measured may yield a method of estimating the primary mass of energetic cosmic rays. An account of earlier measurements of Cerenkov radiation is given as well as a theoretical treatment of the time separation based on computer simulations of showers. The experimental results are presented which demonstrate a sensitivity to cascade development and recommendations for future time separation studies are made.

Item Type:Thesis (Masters)
Award:Master of Science
Thesis Date:1981
Copyright:Copyright of this thesis is held by the author
Deposited On:16 Jul 2013 10:52

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