Depth of maximum of air-shower profiles at the Pierre Auger Observatory : II. Composition implications

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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 di...

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Autores principales: Dova, María Teresa, Hansen, Patricia María, Jarne, Cecilia Gisele, Mariazzi, Analisa Gabriela, Sciutto, Sergio Juan, Wahlberg, Hernán Pablo, The Pierre Auger Collaboration
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2014
Materias:
Ciencias Exactas
Física
Pierre Auger Observatory
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85045
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85045
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
Pierre Auger Observatory
spellingShingle Ciencias Exactas
Física
Pierre Auger Observatory
Dova, María Teresa
Hansen, Patricia María
Jarne, Cecilia Gisele
Mariazzi, Analisa Gabriela
Sciutto, Sergio Juan
Wahlberg, Hernán Pablo
The Pierre Auger Collaboration
Depth of maximum of air-shower profiles at the Pierre Auger Observatory : II. Composition implications
topic_facet Ciencias Exactas
Física
Pierre Auger Observatory
description 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.
format Articulo
Preprint
author Dova, María Teresa
Hansen, Patricia María
Jarne, Cecilia Gisele
Mariazzi, Analisa Gabriela
Sciutto, Sergio Juan
Wahlberg, Hernán Pablo
The Pierre Auger Collaboration
author_facet Dova, María Teresa
Hansen, Patricia María
Jarne, Cecilia Gisele
Mariazzi, Analisa Gabriela
Sciutto, Sergio Juan
Wahlberg, Hernán Pablo
The Pierre Auger Collaboration
author_sort Dova, María Teresa
title Depth of maximum of air-shower profiles at the Pierre Auger Observatory : II. Composition implications
title_short Depth of maximum of air-shower profiles at the Pierre Auger Observatory : II. Composition implications
title_full Depth of maximum of air-shower profiles at the Pierre Auger Observatory : II. Composition implications
title_fullStr Depth of maximum of air-shower profiles at the Pierre Auger Observatory : II. Composition implications
title_full_unstemmed Depth of maximum of air-shower profiles at the Pierre Auger Observatory : II. Composition implications
title_sort depth of maximum of air-shower profiles at the pierre auger observatory : ii. composition implications
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/85045
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