RT Journal Article
T1 Search for isotropic γ radiation in the cosmological window between 65 and 200 TeV
A1 Martínez, S.
A1 Arqueros Martínez, Fernando
A1 Fonseca González, María Victoria
AB 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.
PB Elsevier Science BV
SN 0370-2693
YR 1995
FD 1995-03-15
LK https://hdl.handle.net/20.500.14352/59997
UL https://hdl.handle.net/20.500.14352/59997
LA eng
NO © 1995 Published by Elsevier B.V.The support by the Deutsche Forschungsgemeinschaft DFG, the German Ministry for Research and Technology BMFT and the Spanish Research Council CICYT is gratefully acknowledged. We further thank the Instituto de Astrofisica de Canarias IAC and its president F. Sanchez for supplying excellent working conditions at La Palma.
NO Deutsche Forschungsgemeinschaft (DFG), Alemania
NO Bundesministerium für Bildung und Forschung (BMBF), Alemania
NO Comisión Imterministerial de Ciencia y Tecnolocgñia (CICYT), España
DS Docta Complutense
RD 11 abr 2025