Physics
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phlb..347..161.&link_type=abstract
Physics Letters B, Vol. 347, No. 1 - 2, p. 161 - 170
Physics
23
Gamma Rays: Cosmic Rays
Scientific paper
Electromagnetic energy injected into the Universe above a few hundred TeV is expected to pile up as γ-radiation in a relatively narrow energy interval below 100 TeV due to its interaction with the 2.7K background radiation. We present an upper limit (90% C.L.) on the ratio of primary γ to charged cosmic rays in the energy interval 65 - 160 TeV (80 - 200 TeV) of 10.3×10-3 (7.8×10-3). Data from the HEGRA cosmic-ray detector complex consisting of a wide angle Cerenkov array (AIROBICC) measuring the lateral distribution of air Cerenkov light and a scintillator array, were used with a novel method to discriminate γ-ray and hadron induced air showers. If the presently unmeasured universal far infrared background radiation is not too intense, the result rules out a topological-defect origin of ultrahigh energy cosmic rays for masses of the X particle released by the defects equal to or larger than about 1016GeV.
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