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Title: The Origin and propagation of Ultra-High energy cosmic-ray particles
Authors: Das, Saikat
Thesis Advisor: Gupta, Nayantara
Subject: Astronomy and Astrophysics
Issue Date: Dec-2020
Publisher: Raman Research Institute, Bangalore.
Citation: Ph.D. Thesis, Jawaharlal Nehru University, New Delhi, 2020
Abstract: Cosmic-ray physics has evolved over the last hundred years as a multi-disciplinarysubject entailing high-energy particle physics, relativistic astrophysics, and plasma physics.Cosmic rays are comprised of a wide variety of charged particles, ranging from leptonsto hadrons (baryons and mesons), including atoms and nuclei that hit the Earth’s atmo-sphere after propagating through Galactic or extragalactic distances. The spectrum ofthese particles spans from a few MeV (≡106eV) to∼1ZeV (≡1021eV) energy rangewith a varying flux and mass composition. Of particular interest are the particles withenergies퐸>1EeV (≡1018eV) and extending up to a few times 100 EeV. These are thehighest energy particles observed in the Universe, called theultrahigh-energy cosmic-ray(UHECR) particles. The astrophysical conditions that accelerate particles to such high en-ergies have been probed since their first detection was made atVolcano Ranch Experiment,New Mexico, in 1962. The sources are believed to be extragalactic owing to the inabil-ity of Galactic sources to accelerate particles up to such high energies. ThePierre AugerObservatory(PAO) in Argentina and theTelescope Array(TA) in the United States are state-of-the-art experiments measuring UHECR spectrum, composition, and arrival directionsby reconstructing the giant hadronic cascades they induce in the Earth’s atmosphere.
Description: Open Access
Copyright: This thesis is posted here with the permission of the author. Personal use of this material is permitted. Any other use requires prior permission of the author. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.
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