High energy cosmic ray spectroscopy. I. Status and prospects

Details High energy cosmic ray spectroscopy. I. Status and prospects High energy cosmic ray spectroscopy. I. Status and prospects

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aph.....7....1e&link_type=abstract

ASTROPARTICLE PHYSICS, Volume 7, Issue 1-2, p. 1-13.

Physics

22

Scientific paper

In a recent paper (Nature, 1996, submitted) we claimed that the `bump' in the extensive air shower size spectrum near 10^6 particles is due to heavy nuclei from a comparatively local `source'. The energy spectrum of this single source is of the shape advocated by Berezhko et al. (JETP 82 (1996) 1) for supernova remnants (SNR) and is characterized by, approximately, an E^-2 spectrum up to an energy E_max followed by a rapid fall above. The SNR model makes specific predictions for E_max as a function of nuclear charge. If, as is likely, the CR nuclei are fully ionized, we must identify the `bump' in the paper submitted to Nature with the CNO group of nuclei. We have, accordingly, searched for the corresponding bump due to iron at a bigger shower size. Analysis of the world's data so far leads us to claim its detection, although not, yet, at as high a level of significance as the first bump. Prospects for augmenting the size spectrum technique, for studying what we call this new branch of spectroscopy, are examined.

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