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

2014-12-31Journal article Open access
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dc.contributor.authorPierre Auger collaboration (485 authors)
dc.contributor.authorAbreu, P.
dc.contributor.authorAndringa, S.
dc.contributor.authorAssis, P.
dc.contributor.authorBrogueira, P.
dc.contributor.authorCazon, L.
dc.contributor.authorConceicao, R.
dc.contributor.authorDiogo, F.
dc.contributor.authorEspadanal, J.
dc.contributor.authorGoncalves, P.
dc.contributor.authorOliveira, M.
dc.contributor.authorPimenta, M.
dc.contributor.authorSanto, C.E.
dc.contributor.authorSantos, E.
dc.contributor.authorSarmento, R.
dc.contributor.authorTome, B.
dc.date.accessioned2019-02-04T04:55:47Z
dc.date.available2019-02-04T04:55:47Z
dc.date.issued2014-12-31
dc.date.updated2019-02-04T04:55:47Z
dc.description.abstractUsing 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.
dc.description.versionPeer Reviewed
dc.identifierPhys.Rev. D90 (2014) 122006; DOI 10.1103/PhysRevD.90.122006
dc.identifier.urihttp://dx.doi.org/10.1103/PhysRevD.90.122006
dc.identifier.urihttp://hdl.handle.net/10400.26/26687
dc.language.isoeng
dc.relationTowards a New Giant Detector for Ultra High Energy Cosmic Rays
dc.titleDepth of maximum of air-shower profiles at the Pierre Auger Observatory. II. Composition implications
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleTowards a New Giant Detector for Ultra High Energy Cosmic Rays
oaire.awardURIinfo:eu-repo/grantAgreement/EC/FP7/328826/EU
oaire.fundingStreamFP7
project.funder.identifierhttp://doi.org/10.13039/501100008530
project.funder.nameEuropean Commission
rcaap.rightsopenAccesspt
rcaap.typearticle
relation.isProjectOfPublication693694e3-cc6a-45e0-b44d-75b60766ef34
relation.isProjectOfPublication.latestForDiscovery693694e3-cc6a-45e0-b44d-75b60766ef34

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