Measurement of the cosmic ray composition at the knee with the SPASE-2/AMANDA-B10 detectors

Details Measurement of the cosmic ray composition at the knee with the SPASE-2/AMANDA-B10 detectors Measurement of the cosmic ray composition at the knee with the SPASE-2/AMANDA-B10 detectors

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aph....21..565a&link_type=abstract

Astroparticle Physics, Volume 21, Issue 6, p. 565-581.

Astronomy and Astrophysics

Astronomy

22

Cosmic Rays, Neutrino Astronomy, Mass Composition

Scientific paper

The mass composition of high-energy cosmic rays at energies above 1015 eV can provide crucial information for the understanding of their origin. Air showers were measured simultaneously with the SPASE-2 air shower array and the AMANDA-B10 Cherenkov telescope at the South Pole. This combination has the advantage to sample almost all high-energy shower muons and is thus a new approach to the determination of the cosmic ray composition. The change in the cosmic ray mass composition was measured versus existing data from direct measurements at low energies. Our data show an increase of the mean log atomic mass by about 0.8 between 500 TeV and 5 PeV. This trend of an increasing mass through the ``knee'' region is robust against a variety of systematic effects.

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