An upper limit to the proton fraction in cosmic rays above 10.sup.19./sup. eV from the Pierre Auger Observatory

Abraham, J. - Aglietta, M. - Aguirre, C. - Boháčová, Martina - Hrabovský, Miroslav - Mandát, Dušan - Nosek, D. - Nožka, Libor - Palatka, Miroslav - Pech, Miroslav - Prouza, Michael - Řídký, Jan - Schovánek, Petr - Šmída, Radomír - Trávníček, Petr
An upper limit to the proton fraction in cosmic rays above 10¹⁹ eV from the Pierre Auger Observatory.
Astroparticle Physics. Roč. 27, - (2007), s. 155-168. ISSN 0927-6505. E-ISSN 1873-2852
Impact factor: 3.483, year: 2007
http://hdl.handle.net/11104/0153645