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Title: Studies on the atmospheric erenkov radiation from large cosmic ray showers
Researcher: Boruah, Kalyanee
Guide(s): Pathak, K M
Keywords: Atmospheric
University: Gauhati University
Completed Date: 31/12/1986
Abstract: The experiment on which the present investigation is based was conducted at the Cosmic Radiation Research Laboratory, Physics Department, Gauhati University, India, during the autumn and winter seasons of November 1979 to March 1982. EAS of primary energy Epgt 1016eV were selected by an array of GM Counter Trays. The associated optical Cerenkov pulses were detected by a Cerenkov counter comprising of PM tube and parabolic reflec-ting mirror and recorded by CRO and camera arrangement. In about 140 hours of operation, 457 genuine optical pulses were recorded. The distribution of the pulse heights has been compared with analytical and simulation results deduced by the authoress. The experimental pulse height distribution has further been compared with experimental data of other workers. In the analytical solution of the problem, the primary energy has been tacitly eliminated, since energy could not be determined with the present detecting system. Further, con-tributions from vertical as well as inclined showers have been duly considered. Cerenkov pulse height distributions have also been obtained by the method of Monte Carlo Simulation, assuming four different models of primary mass compositions viz., (i) Pure proton, (ii) Constant mixed, (iii) Rigidity cutoff and (iv) Heavy to light in the energy interval 1016-1018eV. The normalised experimental data when compared with these simulation results, give best fit corresponding to primary mass composition having predominantly protons at energies beyond 1016eV.
Appears in Departments:Department of Physics

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01_title page.pdfAttached File14.06 kBAdobe PDFView/Open
02_certificate.pdf22.62 kBAdobe PDFView/Open
03_abstract.pdf21.36 kBAdobe PDFView/Open
04_preface.pdf22.49 kBAdobe PDFView/Open
05_content.pdf40.52 kBAdobe PDFView/Open
06_chapter 1.pdf540.17 kBAdobe PDFView/Open
07_chapter 2.pdf435.19 kBAdobe PDFView/Open
08_chapter 3.pdf1.01 MBAdobe PDFView/Open
09_chapter 4.pdf134.91 kBAdobe PDFView/Open
10_chapter 5.pdf269.46 kBAdobe PDFView/Open
11_discussion and conclusions.pdf145.08 kBAdobe PDFView/Open
12_appendix a.pdf89.42 kBAdobe PDFView/Open
13_bibliography.pdf150.74 kBAdobe PDFView/Open
14_authoress list of publications.pdf26.55 kBAdobe PDFView/Open
15_acknowledgement.pdf29.07 kBAdobe PDFView/Open

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