Measurement of the cosmic-ray energy spectrum above 1016 eV with the LOFAR Radboud Air Shower ArrayShow others and affiliations
2016 (English)In: Astroparticle physics, ISSN 0927-6505, E-ISSN 1873-2852, Vol. 73, p. 34-43Article in journal (Refereed) Published
Abstract [en]
The energy reconstruction of extensive air showers measured with the LOFAR Radboud Air Shower Array (LORA) is presented in detail. LORA is a particle detector array located in the center of the LOFAR radio telescope in the Netherlands. The aim of this work is to provide an accurate and independent energy measurement for the air showers measured through their radio signal with the LOFAR antennas. The energy reconstruction is performed using a parameterized relation between the measured shower size and the cosmic-ray energy obtained from air shower simulations. In order to illustrate the capabilities of LORA, the all-particle cosmic-ray energy spectrum has been reconstructed, assuming that cosmic rays are composed only of protons or iron nuclei in the energy range between ∼2 × 1016 and 2 × 1018 eV. The results are compatible with literature values and a changing mass composition in the transition region from a Galactic to an extragalactic origin of cosmic rays.
Place, publisher, year, edition, pages
2016. Vol. 73, p. 34-43
Keywords [en]
Cosmic rays, Air showers, Energy spectrum, LORA
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:lnu:diva-47956DOI: 10.1016/j.astropartphys.2015.06.005OAI: oai:DiVA.org:lnu-47956DiVA, id: diva2:877521
2015-12-072015-12-072019-02-27Bibliographically approved