RT Journal Article
T1 Search for isotropic γ-radiation in the cosmological window between 65-tev and 200-tev
A1 Martínez Pabón, María Beatriz
A1 Arqueros Martínez, Fernando
A1 Fernández Sánchez, Paloma
A1 Fonseca, V.
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 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.
PB Elsevier Science BV
SN 0370-2693
YR 1995
FD 1995-03-16
LK https://hdl.handle.net/20.500.14352/60140
UL https://hdl.handle.net/20.500.14352/60140
LA eng
NO © 1995 Elsevier Science 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
NO German Ministry for Research and Technology BMFT
NO Spanish Research Council CICYT
DS Docta Complutense
RD 8 abr 2025