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dc.contributor.authorAab, A.en
dc.contributor.authorAbreu, P.en
dc.contributor.authorAglietta, M.en
dc.contributor.authorAhn, E.en
dc.contributor.authorAl Samarai, I.en
dc.contributor.authorAlbuquerque, I.en
dc.contributor.authorAllekotte, I.en
dc.contributor.authorAllen, J.en
dc.contributor.authorAllison, P.en
dc.contributor.authorAlmela, A.en
dc.contributor.authorAlvarez Castillo, J.en
dc.contributor.authorAlvarez-Muñiz, J.en
dc.contributor.authorAlves Batista, R.en
dc.contributor.authorAmbrosio, M.en
dc.contributor.authorAminaei, A.en
dc.contributor.authorAnchordoqui, L.en
dc.contributor.authorAndringa, S.en
dc.contributor.authorAramo, C.en
dc.contributor.authorAranda, V.en
dc.contributor.authorArqueros, F.en
dc.contributor.authoret al.en
dc.identifier.citationPhysical Review D - Particles, Fields, Gravitation and Cosmology, 2014; 90(12):122006-1-122006-12en
dc.description.abstractUsing the data taken at the Pierre Auger Observatory between December, and December, 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.en
dc.description.statementofresponsibilityA. Aab ...K. B. Barber ... J. A. Bellido ... S. Blaess ... R.W. Clay ... M. J. Cooper ... B. R. Dawson ... T. D. Grubb ... T. A. Harrison ... G. C. Hill ... M. Malacari ... P. Nguyen ... et. al. (Pierre Auger Collaboration)en
dc.publisherAmerican Physical Societyen
dc.rights© 2014 American Physical Societyen
dc.titleDepth of maximum of air-shower profiles at the Pierre Auger Observatory. II. Composition implicationsen
dc.typeJournal articleen
pubs.library.collectionIPAS publicationsen
dc.identifier.orcidBellido, J. [0000-0002-0833-9194]en
dc.identifier.orcidClay, R. [0000-0002-9040-9648]en
dc.identifier.orcidDawson, B. [0000-0002-4271-3055]en
Appears in Collections:IPAS publications

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