An upper limit to the photon fraction in cosmic rays above 1019 eV from the Pierre Auger Observatory
Abraham, J; Aglietta, M; Aguirre, C; Allard, D; Allekotte, I; Allison, P; Alvarez, C; Alvarez-Muniz, J; Ambrosio, M; Anchordoqui, L; Anjos, JC; Aramo, C; Arisaka, K; Armengaud, E; Arneodo, F; Arqueros, F; Asch, T; Asorey, H; Atulugama, BS; Aublin, J; Ave, M; Avila, G; Bacelar, J; Backer, T; Badagnani, D; Barbosa, AF; Barbosa, HMJ; Barkhausen, M; Barnhill, D; Barroso, SLC; Bauleo, P; Beatty, J; Beau, T; Becker, BR; Becker, KH; Bellido, JA; BenZvi, S; Berat, C; Bergmann, T; Bernardini, P; Bertou, X; Biermann, PL; Billoir, P; Blanch-Bigas, O; Blanco, F; Blasi, P; Bleve, C; Blumer, H; Boghrat, P; Bohacova, M; Bonifazi, C; Bonino, R; Boratav, M; Brack, J; Brunet, JM; Buchholz, P; Busca, NG; Caballero-Mora, KS; Cai, B; Camin, DV; Capdevielle, JN; Caruso, R; Castellina, A; Cataldi, G; Cazon, L; Cester, R; Chauvin, J; Chiavassa, A; Chinellato, JA; Chou, A; Chye, J; Claes, D; Clark, PDJ; Clay, RW; Clay, SB; Connolly, B; Cordier, A; Cotti, U; Coutu, S; Covault, CE; Cronin, J; Dagoret-Campagne, S; Dang Quang, T; Darriulat, P; Daumiller, K; Dawson, BR; de Almeida, RM; de Carvalho, LA; De Donato, C; de Jong, SJ; de Mello Jr ,WJM; de Mello Neto, JRT; De Mitri, I; de Oliveira, MAL; de Souza, V; del Peral, L; Deligny, O; Della Selva, A; Delle Fratte, C; Dembinski, H; Di Giulio, C; Diaz, JC; Dobrigkeit, C; D'Olivo, JC; Dornic, D; Dorofeev, A; Dova, MT; D'Urso, D; DuVernois, MA; Engel, R; Epele, L; Erdmann, M; Escobar, CO; Etchegoyen, A; Ewers, A; Facal San Luis, P; Falcke, H; Fauth, AC; Fazio, D; Fazzini, N; Fernandez, A; Ferrer, F; Ferry, S; Fick, B; Filevich, A; Filipcic, A; Fleck, I; Fokitis, E; Fonte, R; Fuhrmann, D; Fulgione, W; Garcia, B; Garcia-Pinto, D; Garrard, L; Garrido, X; Geenen, H; Gelmini, G; Gemmeke, H; Geranios, A; Ghia, PL; Giller, M; Gitto, J; Glass, H; Gobbi, F; Gold, MS; Gomez Albarracin, F; Gomez Berisso, M; Gomez Herrero, R; Goncalves do Amaral, M; Gongora, JP; Gonzalez, D; Gonzalez, JG; Gonzalez, M; Gora, D; Gorgi, A; Gouffon, P; Grassi, V; Grillo, A; Grunfeld, C; Grupen, C; Guarino, F; Guedes, GP; Gutierrez, J; Hague, JD; Hamilton, JC; Harakeh, MN; Harari, D; Harmsma, S; Hartmann, S; Harton, JL; Healy, MD; Hebbeker, T; Heck, D; Hojvat, C; Homola, P; Horandel, J; Horneffer, A; Horvat, M; Hrabovsky, M; Iarlori, M; Insolia, A; Kaducak, M; Kalashev, O; Kampert, KH; Keilhauer, B; Kemp, E; Klages, HO; Kleifges, M; Kleinfeller, J; Knapik, R; Knapp, J; Koang, D-H; Kolotaev, Y; Kopmann, A; Kromer, O; Kuhlman, S; Kuijpers, J; Kunka, N; Kusenko, A; Lachaud, C; Lago, BL; Lebrun, D; LeBrun, P; Lee, J; Letessier-Selvon, A; Leuthold, M; Lhenry-Yvon, I; Longo, G; Lopez, R; Lopez Aguera, A; Lucero, A; Maldera, S; Malek, M; Maltezos, S; Mancarella, G; Mancenido, ME; Mandat, D; Mantsch, P; Mariazzi, AG; Maris, IC; Martello, D; Martinez, N; Martinez, J; Martinez, O; Mathes, HJ; Matthews, J; Matthews, JAJ; Matthiae, G; Maurin, G; Maurizio, D; Mazur, PO; McCauley, T; McEwen, M; McNeil, RR; Medina, G; Medina, MC; Medina Tanco, G; Meli, A; Melo, D; Menichetti, E; Menshikov, A; 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Roucelle, C; Rouille-d'Orfeuil, B; Roulet, E; Rovero, AC; Salamida, F; Salazar, H; Salina, G; Sanchez, F; Santander, M; Santos, EM; Sarkar, S; Sato, R; Scherini, V; Schmidt, T; Scholten, O; Schovanek, P; Schussler, F; Sciutto, SJ; Scuderi, M; Semikoz, D; Sequeiros, G; Shellard, RC; Siffert, BB; Sigl, G; Skelton, P; Slater, W; Smetniansky De Grande, N; Smialkowski, A; Smida, R; Smith, BE; Snow, GR; Sokolsky, P; Sommers, P; Sorokin, J; Spinka, H; Strazzeri, E; Stutz, A; Suarez, F; Suomijarvi, T; Supanitsky, AD; Swain, J; Szadkowski, Z; Tamashiro, A; Tamburro, A; Tascau, O; Ticona, R; Timmermans, C; Tkaczyk, W; Todero Peixoto, CJ; Tonachini, A; Torresi, D; Travnicek, P; Tripathi, A; Tristram, G; Tscherniakhovski, D; Tueros, M; Tunnicliffe, V; Ulrich, R; Unger, M; Urban, M; Valdes Galicia, JF; Valino, I; Valore, L; van den Berg, AM; van Elewyck, V; Vazquez, RA; Veberic, D; Veiga, A; Velarde, A; Venters, T; Verzi, V; Videla, M; Villasenor, L; Vo Van, T; Vorobiov, S; Voyvodic, L; Wahlberg, H; Wainberg, O; Waldenmaier, T; Walker, P; Warner, D; Watson, AA; Westerhoff, S; Wiebusch, C; Wieczorek, G; Wiencke, L; Wilczynska, B; Wilczynski, H; Wileman, C; Winnick, MG; Xu, J; Yamamoto, T; Younk, P; Zas, E; Zavrtanik, D; Zavrtanik, M; Zech, A; Zepeda, A; Zha, M; Ziolkowski, M
Date:
2007
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