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Martínez, S. and Arqueros Martínez, Fernando and Fonseca González, Mª Victoria (1995) Search for isotropic γ radiation in the cosmological window between 65 and 200 TeV. Physics letters B, 347 (1-2). pp. 161-170. ISSN 0370-2693
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Official URL: http://dx.doi.org/10.1016/0370-2693(95)00132-5
Abstract
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 2.7^°K 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 Čerenkov array (AIROBICC) measuring the lateral distribution of air Čerenkov 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 10^16 GeV.
Item Type: | Article |
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Additional Information: | © 1995 Published by Elsevier B.V. |
Subjects: | Sciences > Physics > Materials |
ID Code: | 38101 |
Deposited On: | 13 Jun 2016 15:27 |
Last Modified: | 13 Jun 2016 15:27 |
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