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

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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Publicado: 2014
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v90_n12_p_Multitudinario
http://hdl.handle.net/20.500.12110/paper_15507998_v90_n12_p_Multitudinario
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_15507998_v90_n12_p_Multitudinario
record_format dspace
spelling paper:paper_15507998_v90_n12_p_Multitudinario2023-06-08T16:22:47Z Depth of maximum of air-shower profiles at the Pierre Auger Observatory. II. Composition implications 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. © 2014 American Physical Society. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v90_n12_p_Multitudinario http://hdl.handle.net/20.500.12110/paper_15507998_v90_n12_p_Multitudinario
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
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. © 2014 American Physical Society.
title Depth of maximum of air-shower profiles at the Pierre Auger Observatory. II. Composition implications
spellingShingle 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 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v90_n12_p_Multitudinario
http://hdl.handle.net/20.500.12110/paper_15507998_v90_n12_p_Multitudinario
_version_ 1768542568840167424

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