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Study on Very High Energy Cosmic Ray at Tehran Surface

Sheidaei, Farzaneh | 2008

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 39043 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Samimi, Jalal
  7. Abstract:
  8. The cosmic ray astronomy was born in 1937 when Victor Hess flied with his balloon to the height of 17,500 feet. He found that the cosmic rays come from out of atmosphere. There are three fundamental questions from that time. The goal of all cosmic ray's experimental activities and related theories is finding out the answer of these questions. The first question is about the energy and composition spectrum of cosmic rays. The second one is finding the sources which can product the very high energy particles such as the protons with the energy of 1021eV found in some observatory such as AGASA and Haverah Park. The last question is the process of diffusion of cosmic rays in the galaxy. One of effective approach to these questions is study on anisotropy of cosmic ray. By studying on cosmic ray anisotropy, we are able to investigate on point cosmic ray sources and the structure of interstellar medium where cosmic ray comes through it. In this thesis we study on anisotropy of secondary muons due to geomagnetic field. We found the ratio of positive to negative muons. This ratio is also important in the problem of oscillation of muons. For the second step we study on geomagnetic effect on the data of scintillator and Cherenkov arrays. Meanwhile we worked on optimizing the Cherenkov detectors we studied on shadow of the moon as a method to find the angular resolution of our arrays. Study on the sun shadow is a way to study on the behavior of magnetic field of the sun. In the last step we worked on anisotropy of cosmic ray due to the motion of the earth in the galaxy. This effect called Compton-Getting in honor of two scientists who introduced this effect for the first time
  9. Keywords:
  10. Cosmic Rays ; Anisotropy ; Geomagnetic Field ; Neutrino Oscillation ; Sun Shadow ; Chernekov Radiation ; Positive-Negative Muon ; Moon Shadow ; Compton-Getting Effect

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