Mass composition of ultra-high-energy cosmic rays at the Pierre Auger Observatory

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F25%3A00640394" target="_blank" >RIV/68378271:_____/25:00640394 - isvavai.cz</a>

Alternative codes found

RIV/61989592:15310/25:73634779

Result on the web

<a href="https://pos.sissa.it/484/041/pdf" target="_blank" >https://pos.sissa.it/484/041/pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.22323/1.484.0041" target="_blank" >10.22323/1.484.0041</a>

Result language

angličtina

Original language name

Mass composition of ultra-high-energy cosmic rays at the Pierre Auger Observatory

Original language description

For the past 20 years, the Pierre Auger Observatory has collected the largest dataset of ultra-high- energy cosmic rays (UHECRs) ever achieved using a hybrid detector. The study of this dataset has led to numerous unexpected discoveries that enhance our understanding of the origins of UHECRs. One of the key points in this study is their mass composition. In this work, we will present the most recent results regarding the mass composition of UHECRs at the Pierre Auger Observatory. In particular, we will focus on the measurement of the depth of the maximum of air-shower profiles, denoted as Xmax . This determination has been achieved through both direct measurements from the Fluorescence Detector data and the application of machine learning for estimating Xmax on an event-by-event basis using the Surface Detector data. The latter has allowed us to extend the measurement to energies up to 100 EeV and indicates a correlation between changes in composition and three features of the energy spectrum (ankle, instep, steepening). Moreover, the results provide evidence of a heavy and nearly pure primary beam for energies greater than 50 EeV that is independent of the hadronic interaction model. The implications of these findings for astrophysics and for modelling hadronic interactions will be discussed.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

10303 - Particles and field physics

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Proceedings of Science

ISBN

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ISSN

1824-8039

e-ISSN

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Number of pages

8

Pages from-to

041

Publisher name

Sissa Medilab srl

Place of publication

Trieste

Event location

Malargüe

Event date

Nov 17, 2024

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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