The Cosmic-Ray Proton Spectrum as measured with HEGRA system of IACTs

Details The Cosmic-Ray Proton Spectrum as measured with HEGRA system of IACTs The Cosmic-Ray Proton Spectrum as measured with HEGRA system of IACTs

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icrc....3..175h&link_type=abstract

Proceedings of the 26th International Cosmic Ray Conference. August 17-25, 1999. Salt Lake City, Utah, USA. Under the auspices o

Physics

Scientific paper

ˇ The HEGRA collaboration operates a stereoscopic system of 5 imaging atmospheric Cerenkov telescopes (IACT) at La Palma (Canary Islands). This instrument has been used to measure the spectrum of the Cosmic Ray (CR) protons in the energy range of 1-10 TeV. The high detection rate of about 12 Hz for the CRs, the effective suppression of air showers induced by heavy nuclei on the trigger level as well as by the software analysis, and the 50% energy resolution for proton-induced air showers, allow us to determine the spectrum of the CR protons. The data are well reproduced by a power-law over the entire energy range. The best fit to the data at ˜3 TeV gives a differential spectral index of 2:72 +/- 0:02(stat) +/- 0:15(syst) and an integral proton flux J( 1:5 TeV) = (3:1 +/- 0:6 +/- 1:2) ? 102 particles s,1 sr,1m,2 , consistent, within the statistical and systematic errors, with recent satellite and balloon-borne measurements.

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