A limit to the rate of ultra high energy gamma-rays in the primary cosmic radiation

Details A limit to the rate of ultra high energy gamma-rays in the primary cosmic radiation A limit to the rate of ultra high energy gamma-rays in the primary cosmic radiation

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aph.....6...71e&link_type=abstract

ASTROPARTICLE PHYSICS, Volume 6, Issue 1, p. 71-75.

Physics

9

Scientific paper

An upper limit to the flux of Ultra High Energy (UHE) gamma-rays in the primary cosmic radiation is obtained through the data of the electromagnetic and the muon detectors of the EAS-TOP Extensive Air Shower array (Campo Imperatore, National Gran Sasso Laboratories, atmospheric depth 810 g cm^-2). The search is performed by selecting Extensive Air Showers (EAS) with low muon content. For EAS electron sizes N_e > 6.3.10^5, no showers are observed with the core located inside a fiducial area and no muons recorded in the 140 m^2 muon detector, during a live time of 8440 h. The 90% c.l. upper limit to the relative intensity of gamma-ray with respect to cosmic ray (c.r.) primaries is I_gamma/I_c.r.<7.3.10^-5, at primary energy E_0>=10^15 eV: this limit is lower than reported in previous measurements.

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