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Title: Mass composition of ultra-high-energy cosmic rays at the Pierre Auger Observatory Authors: ID Fitoussi, Thomas (Author) ID Filipčič, Andrej (Author) ID Lundquist, Jon Paul (Author) ID Shivashankara, Shima Ujjani (Author) ID Stanič, Samo (Author) ID Vorobiov, Serguei (Author) ID Zavrtanik, Danilo (Author) ID Zavrtanik, Marko (Author), et al. Files: UHECR2024_041.pdf (1,66 MB) MD5: FD23FA57768BF3B648E1FB5C6B2BC683   https://doi.org/10.22323/1.484.0041   https://pos.sissa.it/484/041/pdf   This document has even more files. Complete list of files is available below. Language: English Work type: Unknown Typology: 1.08 - Published Scientific Conference Contribution Organization: UNG - University of Nova Gorica Abstract: 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. Keywords: ultra-high-energy cosmic rays, Pierre Auger Observatory, extensive air showers, UHECR mass composition Publication status: Published Publication version: Version of Record Year of publishing: 2025 Number of pages: 8 str. PID: 20.500.12556/RUNG-9950  COBISS.SI-ID: 230645763  UDC: 52 ISSN on article: 1824-8039 DOI: 10.22323/1.484.0041  NUK URN: URN:SI:UNG:REP:WFXSTTVC Publication date in RUNG: 28.03.2025 Views: 254 Downloads: 6 Metadata:    Cite this work Plain text BibTeX EndNote XML EndNote/Refer RIS ABNT ACM Ref AMA APA Chicago 17th Author-Date Harvard IEEE ISO 690 MLA Vancouver : Copy citation

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Record is a part of a proceedings

Title:	UHECR 2024, The 7th International Symposium on Ultra-High-Energy Cosmic Rays
COBISS.SI-ID:	229932291

Record is a part of a journal

Title:	Proceedings of science
Shortened title:	Pos proc. sci.
Publisher:	Sissa
ISSN:	1824-8039
COBISS.SI-ID:	20239655

Document is financed by a project

Funder:	ARIS - Slovenian Research and Innovation Agency
Project number:	P1-0031
Name:	Večglasniška astrofizika

Licences

License:	CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:	http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:	The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

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