The mass composition of cosmic rays measured with LOFAR

Jörg R. Hörandel, A. Bonardi, S. Buitink, A. Corstanje, H. Falcke, P. Mitra, K. Mulrey, A. Nelles, J. P. Rachen, L. Rossetto, P. Schellart, O. Scholten, S. ter Veen, S. Thoudam, T. N. G. Trinh, T. Winchen

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    Abstract

    High-energy cosmic rays, impinging on the atmosphere of the Earth initiate cascades of secondary particles, the extensive air showers. The electrons and positrons in the air shower emit electromagnetic radiation. This emission is detected with the LOFAR radio telescope in the frequency range from 30 to 240 MHz. The data are used to determine the properties of the incoming cosmic rays. The radio technique is now routinely used to measure the arrival direction, the energy, and the particle type (atomic mass) of cosmic rays in the energy range from 1017 to 1018 eV. This energy region is of particular astrophysical interest, since in this regime a transition from a Galactic to an extra-galactic origin of cosmic rays is expected. For illustration, the LOFAR results are used to set constraints on models to describe the origin of high-energy cosmic rays.
    Original languageEnglish
    Title of host publication6th Roma International Conference on Astroparticle Physics
    Subtitle of host publicationRICAP16
    PublisherEPJ Web of Conferences
    Number of pages6
    Volume136
    DOIs
    Publication statusPublished - 23-Mar-2017
    Event6th Roma International Conference on Astroparticle Physics - Rome, Italy
    Duration: 21-Jun-201624-Jun-2016
    https://agenda.infn.it/conferenceDisplay.py?confId=10450

    Conference

    Conference6th Roma International Conference on Astroparticle Physics
    Abbreviated titleRICAP16
    Country/TerritoryItaly
    CityRome
    Period21/06/201624/06/2016
    Internet address

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