Search for dissertations about: "cosmic gamma radiation"

Showing result 1 - 5 of 9 swedish dissertations containing the words cosmic gamma radiation.

  1. 1. Multi-messenger emission from gamma-ray bursts

    University dissertation from KTH Royal Institute of Technology

    Author : Filip Samuelsson; Felix Ryde; Peter Mészáros; [2020]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; astrophysics; gamma-ray bursts; cosmic rays; Atomic; Subatomic and Astrophysics; Atomär fysik; subatomär fysik och astrofysik;

    Abstract : Multi-messenger astronomy is a very hot topic in the astrophysical community. A messenger is something that carries information. Different astrophysical messenger types are photons, cosmic rays, neutrinos, and gravitational waves. They all carry unique and complementary information to one another. READ MORE

  2. 2. Study of Two-Photon processes at low Q2 using the VSAT calorimeter in the DELPHI experiment

    University dissertation from Lund University

    Author : Pavel Tyapkin; [2004]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; högenergi; QCD; STIC; VSAT; DELPHI; LEP; antitag; double tag; single tag; photon structure function; hadronic cross-section; virtual photons; two-photon; gamma-gamma; Kosmisk strålning; cosmic rays; High energy interactions; PHOJET; TWOGAM; PYTHIA; VDM; GSP; Fysicumarkivet A:2004:Tyapkin;

    Abstract : The study is based on data collected at the LEP II accelerator during the second period of the Large Electron-Positron collider operations (1996-2000). During that time the DELPHI (DEtector with Lepton, Photon and Hadron Identification) experiment collected about 90 Gb of data on tape corresponding to 687-691 pb-1 of luminosity. READ MORE

  3. 3. Cosmic dust and heavy neutrinos

    University dissertation from Luleå : Luleå tekniska universitet

    Author : Erik Elfgren; [2007]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Fysik; Fysik;

    Abstract : This Doctoral thesis treats two subjects. The first subject is the impact of early dust on the cosmic microwave background (CMB). The dust that is studied comes from the first generation of stars, which were hot and short-lived, ending their lives as giant supernovae. READ MORE

  4. 4. PoGOLite The Polarised Gamma-ray Observer

    University dissertation from Stockholm : KTH

    Author : Cecilia Marini Bettolo; Mark Pearce; Christian Bohm; [2008]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik;

    Abstract : PoGOLite is a balloon-borne experiment which will study polarised soft gamma-ray emission from astrophysical targets in the 25 keV – 80 keV energy range by applying well-type phoswich detector technology. Polarised gamma-rays are expected from a wide variety of sources including rotation-powered pulsars, accreting black holes and neutron stars, and jet-dominated active galaxies. READ MORE

  5. 5. Cosmic clues from astrophysical particles

    University dissertation from KTH Royal Institute of Technology

    Author : Francesca Capel; Christer Fuglesang; Michael Unger; [2020]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik;

    Abstract : Ultra-high-energy cosmic rays (UHECRs) are charged particles that have been accelerated to extreme energies, such that they are effectively travelling at the speed of light. Interactions of these particles with the Earth’s atmosphere lead to the development of extensive showers of particles and radiation that can be measured with existing technology. READ MORE