Artículo
Depths of Maximum of Air-Shower Profiles at the Pierre Auger Observatory: II. Composition Implications.
Aab, A.; Abreu, P.; Aglietta, M.; Ahn, E.J.; Al Samarai, I.; Allekotte, Ingomar; Almela, Daniel Alejandro
; Asorey, Hernán Gonzalo
; Bertou, Xavier Pierre Louis
; Dasso, Sergio Ricardo
; Dova, Maria Teresa
; Etchegoyen, Alberto
; Figueira, Juan Manuel
; Filevich, Alberto
; Garcia, Beatriz Elena
; Gomez Berisso, Mariano
; González, Nicolás Martín
; Hampel, Matias Rolf
; Hansen, Patricia Maria
; Harari, Diego Dario
; Jarne, Cecilia Gisele
; Josebachuili Ogando, Mariela Gisele
; Lucero, Luis Agustin
; Mariazzi, Analisa Gabriela
; Masías Meza, Jimmy Joel
; Melo, Diego Gabriel
; Micheletti, Maria Isabel
; Mollerach, Maria Silvia
; Pallotta, Juan Vicente
; Piegaia, Ricardo Nestor
; Platino, Manuel
; Pieroni, Pablo Emanuel
; Purrello, Víctor Hugo
; Quel, Eduardo Jaime
; Ravignani Guerrero, Diego; Ristori, Pablo Roberto; Roulet, Esteban
; Rovero, Adrian Carlos
; Sanchez, Federico Andrés
; Sciutto, Sergio Juan
; Sidelnik, Iván Pedro
; Suarez, Federico
; Supanitsky, Alberto Daniel
; Taborda Pulgarin, Oscar Alejandro
; Tapia Casanova, Alex Marcelo
; Videla, M.; Wahlberg, Hernan Pablo
; Wainberg, Oscar Isaac; Wundheiler, Brian
; Pierre Auger Collaboration







































Fecha de publicación:
12/2014
Editorial:
American Physical Society
Revista:
Physical Review D: Particles, Fields, Gravitation and Cosmology
ISSN:
2470-0010
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Resumen
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 (Xmax), 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.
Archivos asociados
https://doi.org/10.1103/PhysRevD.90.122006
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.90.122006
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.90.122006

Citación:
Aab, A.; Abreu, P.; Aglietta, M.; Ahn, E.J.; Al Samarai, I.; et al.; Depths of Maximum of Air-Shower Profiles at the Pierre Auger Observatory: II. Composition Implications.; American Physical Society; Physical Review D: Particles, Fields, Gravitation and Cosmology; 90; 12; 12-2014; 1-12; 122006
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