An upper limit to the photon fraction in cosmic rays above $10^{19}$-eV from the Pierre Auger Observatory
John M Abraham,G R Snow,I C Maris,J F Valdes Galicia,L A De Carvalho,S Coutu,Luis Del Peral,C Timmermans,A F Barbosa,T Asch,M G Winnick,P Lebrun,A Horneffer, Francisca Ferrer,O Tascau,K Arisaka,F Schussler,P Sokolsky,M Iarlori,T Hebbeker,Esteban Roulet,J Pekala,S J De Jong,M Barkhausen,M T Dova,J R T De Mello Neto,M D Healy,H Wilczynski,Angela V Olinto,T Beau,J Rodriguez Rojo,O Kalashev,K Payet,M E Mancenido,V De Souza,E M Santos,G Matthiae,J C Anjos,B Wilczynska,Alan Watson,J Aublin,S Petrera,J D Hague,M Monasor,C H Wiebusch,L Garrard,M Kleifges,D Lebrun,Christine Meurer,M Erdmann,D Pham Ngoc,A Veiga,P O Mazur,M Santander,A C Fauth,B Keilhauer,M Leuthold,L N Epele,S Robbins,G Tristram,R Mussa,M Gonzalez,L Perrone,Jose Chinellato,D Monnier Ragaigne,D V Semikoz,H Falcke,A Risi,D Veberic,J R Horandel,A Letessierselvon,R J Nichol,C Dobrigkeit,L Otero,M Kaducak,D Melo,E Kemp,B Cai,F Gomez Albarracin,E Moreno,K Daumiller,C Roucelle, J Rdky,S Kuhlman,S Harmsma,R Pelayo,G Maurin, Joaquin M Gutierrez,M Gomez Berisso,H C Reis,R Engel,M Boratav,M Gold,M Roth,Martin D Ambrosio,A Etchegoyen,J Gitto,J C S Bacelar,A Tamburro,T N Pham Thi,H J Mathes,C Di Giulio,J Brack,J Rautenberg,P Darriulat,A K Tripathi,Paul Sommers,S Ferry,J Oehlschlager,F Suarez,A Z Menshikov,M A Mostafa,I Fleck,H Wahlberg,M Horvat,R Piegaia,A Smialkowski,Gunter Sigl,D Badagnani,Narei Lorenzo Martinez,S Sarkar,P Younk,M Goncalves Do Amaral,A Meli,Y Kolotaev,D Heck,D Maurizio,Francisca Javiela Munoz Sanchez,M Scuderi,D Claes,V Tunnicliffe,Heiko Geenen, Paolo Nevone Blasi,C Newmanholmes,M Giller,A M Van Den Berg,Aaron S Chou,G M Longo,B Revenu,A Filevich,P Walker, Julia Diaz,C J Todero Peixoto,P Allison,D Torresi,H Blumer,X Garrido,Peter L Biermann,G Navarra,J C Dolivo,T A Porter,L Valore,G Wieczorek,D Allard,J Pallotta,V Scherini,H M Spinka,G Salina,M Risse,Bruce R Dawson,D V Camin,J M Brunet,D Tscherniakhovski,J L Harton,A C Rovero, Jose Javier Meana Martinez,M Zavrtanik,T Mccauley,M Tueros,C Berat, Tsuyoshi Yamamoto,C Aguirre,S Dagoretcampagne,C Alvarez,P Buchholz, N Nierstenhofer,Carla Bonifazi,R A Vazquez,Bruce Rafael Mellado Garcia,I De Mitri,I M Pepe,M Aglietta, Cherrie R Morris,P Travnicek,R Fonte,O Wainberg,S L C Barroso,Philip Clark,D Newton,J Chauvin,A Kopmann, L Prado Junoior,A D Supanitsky,M Palatka,V M Olmosgilbaja,G Parente,A Tonachini,A Filipcic,J Rodriguez Martino,A G Mariazzi,E Parizot,C Morello,H M J Barbosa,Beatriz B Siffert,F Montanet,J N Capdevielle,F Arneodo,G Ros,O Kromer,H Asorey,D Gora,Ofelia Pisanti,Till Bergmann,G Sequeiros,A Chiavassa,D Martello,M Videla,Abel Fernandez,Cameron N Riviere,J E Swain,P Billoir,R Sato,O Deligny,P M Mantsch,R Knapik, Olga Martinez,S B Clay,C E Covault,R M De Almeida,R Ticona,O Scholten,A Ewers,G Mancarella,S Vorobiov,S Benzvi,J Alvarezmuniz,T Waldenmaier,M Muller,P Bernardini,M Roberts,R R Mcneil,P L Ghia,B E Smith,Warner A Miller,L Wiencke,R Caruso,G Medina Tanco,V Van Elewyck,W J M De Mello Junior, M Dolores Rodriguez Frias,C Escobar,M Mcewen,A Geranios,F Arqueros,S Reucroft,F Salamida,R Gomez Herrero,S Ostapchenko,M A L De Oliveira,C Wileman,J Pouryamout,M N Harakeh,B Becker,T Vo Van,B L Lago,H Gemmeke,F Guarino,J A Bellido,C Grupen,Miroslav Hrabovsky,D Harari,C Delle Fratte,P Homola,M Ave,Terri A Schmidt,N Smetniansky De Grande,J Chye,V Grassi,D Nitz,A Tamashiro,A Insolia,Z Szadkowski,T Ohnuki,T Suomijarvi,R Meyhandan,J J Beatty,R Cester,D H Koang,D Gonzalez,B E Fick,K H Becker,M I Micheletti,E Zas,T Nguyen Thi,W Fulgione,L Villasenor,D Barnhill,K S Caballeromora, B Rouilledorfeuil,W Slater,E Menichetti,A Dorofeev,Michael A Unger,J A Knapp,G Rodriguez, Manuel Ortiz,M Prouza,P Bauleo,T Paul,P Skelton, Hans T Castro Salazar,S Maldera,Jeanchristophe Hamilton,C Lachaud,J G Gonzalez,R C Shellard,D Fazio,C Grunfeld,A Gorgi,D Warner,A Kusenko,A Lopez Aguera,G Medina,S Westerhoff,H Nogima,Jorge L Rosado,Ramon Lopez,R Smida,M Bohacova,L Nozka,R W Clay,A A Grillo,D Nosek,A Stutz,C Hojvat,F Gobbi, Guillermo Vazquez Avila,Daniel R Fuhrmann,E Strazzeri,J Kleinfeller,H Glass,T Dang Quang,James W Cronin,N Fazzini,S Parlati, Jaehyun Lee,X Bertou,D Mandat,B Connolly,M Zha,H Dembinski,K H Kampert,A Zech,N G Busca,D Dornic,O Blanchbigas,M Pech, Yu N Petrov,V Verzi,Sven Hartmann,D Zavrtanik,C De Donato,P Privitera,I Lhenryyvon,I Valino,J A J Matthews,J P Gongora, Francisco Puig Blanco,C Aramo,L Nellen, A J Lucero,A Della Selva,D Durso,T Venters,U Cotti,E J Quel,J Sorokin,E Fokitis,J Kuijpers,C Bleve,A Zepeda,C Robledo,L Voyvodic,G Cataldi,P Schovanek,Gennaro Miele,A Cordier,D Garciapinto,R Ulrich,T Backer,A Castellina,E Armengaud,S J Sciutto, M K Patel,Graciela B Gelmini,Marcel Urban,G P Guedes,L Anchordoqui,V Rizi,M A Duvernois,W Tkaczyk,H O Klages, Jianfeng Xu,P Petrinca, Mira A Malek,P Facal San Luis,A Velarde,L Cazon,B Morales,S Maltezos,N Kunka,Silvia Mollerach,R Bonino,B S Atulugama,M Ziolkowski,M C Medina,I Allekotte,P Boghrat,P Gouffon,T Pierog
Astroparticle Physics（2007）
Cited 23|Views96
Key words
iron,cosmic rays
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