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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:.pdf UHECR2024_041.pdf (1,66 MB)
MD5: FD23FA57768BF3B648E1FB5C6B2BC683
 
URL https://doi.org/10.22323/1.484.0041
 
URL https://pos.sissa.it/484/041/pdf
 
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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 New window
COBISS.SI-ID:230645763 New window
UDC:52
ISSN on article:1824-8039
DOI:10.22323/1.484.0041 New window
NUK URN:URN:SI:UNG:REP:WFXSTTVC
Publication date in RUNG:28.03.2025
Views:221
Downloads:6
Metadata:XML DC-XML DC-RDF
:
FITOUSSI, Thomas, FILIPČIČ, Andrej, LUNDQUIST, Jon Paul, SHIVASHANKARA, Shima Ujjani, STANIČ, Samo, VOROBIOV, Serguei, ZAVRTANIK, Danilo and ZAVRTANIK, Marko, 2025, Mass composition of ultra-high-energy cosmic rays at the Pierre Auger Observatory. In : UHECR 2024, The 7th International Symposium on Ultra-High-Energy Cosmic Rays [online]. Published Scientific Conference Contribution. 2025. [Accessed 7 April 2025]. Retrieved from: https://repozitorij.ung.si/IzpisGradiva.php?lang=eng&id=9950
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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 New window

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 New window

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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.pdf UHECR2024_041.pdf
Presentation file - 1,66 MB
MD5: FD23FA57768BF3B648E1FB5C6B2BC683
URL https://doi.org/10.22323/1.484.0041
Source URL
URL https://pos.sissa.it/484/041/pdf
Source URL
URL https://www.auger.org/archive/authors_2024_11.html
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