Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 6 of 6 for “"positron fraction"”.
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Towards a precise measurement of the cosmic-ray positron fraction
… at a precise measurement of the cosmic-ray positron fraction extending to an as yet unreached range of energy. The indirect search for dark matter is the main motivation for this endeavour. The evolution and large-scale structure of the Universe is described by the Hot Big Bang model which …
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A precision measurement of the cosmic ray positron fraction on the International Space Station
… This thesis presents a study of the cosmic ray positron fraction in AMS-02 data covering an energy range of 0.5 GeV to 500 GeV, and identifies 10.3 x 106 electron and 650 x 101 positron events. The results show that the positron fraction increases with energy and reaches a maximum at 275 ± 32 …
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Dark matter searches with cosmic-ray detectors and the Square Kilometre Array
… such as the SKA. In this work, we focus on the positron fraction measured in the Solar System due to dark matter annihilating in the dark matter galactic halo, but also on radio signals from the Milky Way and dwarf spheroidal galaxies. Our main purpose is to constrain the dark matter parameter …
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Signatures of SUSY dark matter at the LHC and in the spectra of cosmic rays
… that luminous matter amounts only to a small fraction of the energy density in the universe. More than 75% is accounted for by what is called the dark energy, and about 20% must exist in the form of some kind of non-relativistic dark matter. Among the candidates for the constituents of dark …
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Galactic Dark Matter
… In Appendix A, the recent observations of the positron fraction and the total electron spectrum in cosmic rays are addressed by considering a nested leaky-box model for the propagation of cosmic rays in the Galaxy. This is found to obviate the need for exotic processes such as the annihilation …
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Search for cosmic-ray antiparticles with bolloon-borne and space-borne experiments
… the AMS-02 possibilities for the detection of positrons and antiprotons are studied.