Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory

ABRAHAM, J., ABREU, P., AGLIETTA, M., BOHÁČOVÁ, Martina, CHUDOBA, Jiří, HALENKA, Viktor, HRABOVSKÝ, Miroslav, MANDÁT, Dušan, KÁROVÁ, Tatiana, NEČESAL, Petr, PALATKA, Miroslav, PECH, Miroslav, PROUZA, Michael, ŘÍDKÝ, Jan, SCHOVANCOVÁ, Jaroslava, SCHOVÁNEK, Petr, ŠMÍDA, Radomír, TRÁVNÍČEK, Petr. Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory. Astroparticle Physics. 2009, 31(6), 399-406. ISSN 0927-6505. E-ISSN 1873-2852. Available: doi: 10.1016/j.astropartphys.2009.04.003