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Durham e-Theses
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Study of extensive air showers at sea level

Darjazi, Soltanzadeh Mohammad Mahdi (1983) Study of extensive air showers at sea level. Doctoral thesis, Durham University.



The zenith angle distribution of EAS over the size range 10(^4) -1.4.10(^6) particles at sea level has been studied. Representing the zenith angle distribution by 1(θ) = I(O)cos(^n)θ it is found that n = 8.4 (^+) (_-) 0.3 over the size range 5.10(^10) 1.4.10(^6) particles. For the smallest sizes studied 10(^4) < 5.10(^4) the measurements suggest n decreases to 5.1 (^+)(_-)1.3,The design and performance of a prototype plastic scintillation counter of area 80 cm 50 cm = 0.4 m(^2) is described. The response of the counter is such that it gives a single particle peak well resolved from the noise when its response to the global cosmic ray flux is displayed on a pulse height analyser. Two such counters of this type were used as local electron density detectors to register the arrival of extensive air showers in a tachyon search experiment. The tachyon search experiment showed evidence that tachyons may be associated with extensive air showers of local electron density > 25m(^-2) The evidence is based on the observation of an excess of ionising events (4.4 standard deviations above the background) occurring in the 85-95 us time domain before the arrival of the main shower front at sea level.

Item Type:Thesis (Doctoral)
Award:Doctor of Philosophy
Thesis Date:1983
Copyright:Copyright of this thesis is held by the author
Deposited On:15 May 2013 14:14

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