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Rodriguez Fernandez G, Rodriguez Rojo J, Rodriguez-Frias MD, Rogozin D, Ros G, Rosado J, Rossler T, Roth M, Roulet E, Rovero AC, Saffi SJ, Saftoiu A, Salamida F, Salazar H, Saleh A, Greus FS, Salina G, Sanchez F, Sanchez-Lucas P, Santo CE, Santos E, Santos EM, Sarazin F, Sarkar B, Sarmento R, Sato R, Scharf N, Scherini V, Schieler H, Schiffer P, Schmidt D, Scholten O, Schoorlemmer H, Schovanek P, Schulz A, Schulz J, Schumacher J, Sciutto SJ, Segreto A, Settimo M, Shadkam A, Shellard RC, Sidelnik I, Sigl G, Sima O, Smialkowski A, Smida R, Snow GR, Sommers P, Sorokin J, Squartini R, Srivastava YN, Stanic S, Stapleton J, Stasielak J, Stephan M, Stutz A, Suarez F, Suomijaervi T, Supanitsky AD, Sutherland MS, Swain J, Szadkowski Z, Szuba M, Taborda OA, Tapia A, Tartare M, Tepe A, Theodoro VM, Timmermans C, Todero Peixoto CJ, Toma G, Tomankova L, Tome B, Tonachini A, Torralba Elipe G, Torres Machado D, Travnicek P, Trovato E, Tueros M, Ulrich R, Unger M, Urban M, Valdes Galicia JF, Valino I, Valore L, Van Aar G, Van Bodegom P, Van Den Berg AM, Van Velzen S, Van Vliet A, Varela E, Vargas Cardenas B, Varner G, Vazquez JR, Vazquez RA, Veberic D, Verzi V, Vicha J, Videla M, Villasenor L, Vlcek B, Vorobiov S, Wahlberg H, Wainberg O, Walz D, Watson AA, Weber M, Weidenhaupt K, Weindl A, Werner F, Widom A, Wiencke L, Wilczynska B, Wilczynski H, Will M, Williams C, Winchen T, Wittkowski D, Wundheiler B, Wykes S, Yamamoto T, Yapici T, Yuan G, Yushkov A, Zamorano B, Zas E, Zavrtanik D, Zavrtanik M, Zaw I, Zepeda A, Zhou J, Zhu Y, Zimbres Silva M, Ziolkowski M, Zuccarello F (2014)
Publication Status: Published
Publication Type: Journal article
Publication year: 2014
Publisher: AMER PHYSICAL SOC
Book Volume: 90
Article Number: ARTN 122006
Journal Issue: 12
DOI: 10.1103/PhysRevD.90.122006
Using the data taken at the Pierre Auger Observatory between December 2004 and December 2012, we have examined the implications of the distributions of depths of atmospheric shower maximum (X-max), using a hybrid technique, for composition and hadronic interaction models. We do this by fitting the distributions with predictions from a variety of hadronic interaction models for variations in the composition of the primary cosmic rays and examining the quality of the fit. Regardless of what interaction model is assumed, we find that our data are not well described by a mix of protons and iron nuclei over most of the energy range. Acceptable fits can be obtained when intermediate masses are included, and when this is done consistent results for the proton and iron-nuclei contributions can be found using the available models. We observe a strong energy dependence of the resulting proton fractions, and find no support from any of the models for a significant contribution from iron nuclei. However, we also observe a significant disagreement between the models with respect to the relative contributions of the intermediate components.
APA:
Aab, A., Abreu, P., Aglietta, M., Ahn, E.J., Al Samarai, I., Albuquerque, I.F.M.,... Zuccarello, F. (2014). Depth of maximum of air-shower profiles at the Pierre Auger Observatory. II. Composition implications. Physical Review D, 90(12). https://dx.doi.org/10.1103/PhysRevD.90.122006
MLA:
Aab, A., et al. "Depth of maximum of air-shower profiles at the Pierre Auger Observatory. II. Composition implications." Physical Review D 90.12 (2014).
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