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Martínez Pabón, María Beatriz and Arqueros Martínez, Fernando and Fernández Sánchez, Paloma and Fonseca, V. (1995) Search for isotropic γ-radiation in the cosmological window between 65-tev and 200-tev. Physics letters B, 347 (1-feb.). 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 Cerenkov 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 Elsevier Science B.V. |
Uncontrolled Keywords: | Astronomy and Astrophysics; Physics, Nuclear; Physics, Particles and Fields |
Subjects: | Sciences > Physics > Materials Sciences > Physics > Solid state physics Sciences > Physics > Nuclear physics |
ID Code: | 43020 |
Deposited On: | 05 Jun 2017 11:10 |
Last Modified: | 10 Dec 2018 14:58 |
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