An upper limit to the photon fraction in cosmic rays above 10**19-eV from the Pierre Auger Observatory

Creators

• Abraham, J.
• Aglietta, M.
• Aguirre, C.
• Allard, D.
• Allekotte, I.
• Allison, P.
• Alvarez, C.
• Alvarez-Muniz, J.
• Ambrosio, M.
• Anchordoqui, L.
• Anjos, J.C.
• Aramo, C.
• Arisaka, K.
• Armengaud, E.
• Arneodo, F.
• Arqueros, F.
• Asch, T.
• Asorey, H.
• Atulugama, B.S.
• Aublin, J.
• Ave, M.
• Centro Atomico Bariloche
• Buenos Aires, CONICET
• La Plata U.
• Pierre Auger Observ.
• CNEA, San Martin
• Adelaide U.
• Catholic U. of Bolivia, La Paz
• Bolivia U.
• Sao Paulo U.
• Campinas State U.
• UEFS, Feira de Santana
• Bahia U.
• Rio de Janeiro Federal U.
• Niteroi, Fluminense U.
• Charles U.
• Prague, Inst. Phys.
• Orsay, LPT
• APC, Paris
• Orsay, LAL
• Paris U., VI-VII
• LPSC, Grenoble
• Fermi National Accelerator Lab., Batavia, IL (United States)