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

Fitoussi, Thomas; Filipčič, Andrej; Lundquist, Jon Paul; Shivashankara, Shima Ujjani; Stanič, Samo; Vorobiov, Serguei; Zavrtanik, Danilo; Zavrtanik, Marko

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Naslov:	Mass composition of ultra-high-energy cosmic rays at the Pierre Auger Observatory
Avtorji:	ID Fitoussi, Thomas (Avtor) ID Filipčič, Andrej (Avtor) ID Lundquist, Jon Paul (Avtor) ID Shivashankara, Shima Ujjani (Avtor) ID Stanič, Samo (Avtor) ID Vorobiov, Serguei (Avtor) ID Zavrtanik, Danilo (Avtor) ID Zavrtanik, Marko (Avtor), et al.
Datoteke:	UHECR2024_041.pdf (1,66 MB) MD5: FD23FA57768BF3B648E1FB5C6B2BC683 https://doi.org/10.22323/1.484.0041 https://pos.sissa.it/484/041/pdf To gradivo ima še več datotek. Celoten seznam je na voljo spodaj.
Jezik:	Angleški jezik
Vrsta gradiva:	Neznano
Tipologija:	1.08 - Objavljeni znanstveni prispevek na konferenci
Organizacija:	UNG - Univerza v Novi Gorici
Opis:	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.
Ključne besede:	ultra-high-energy cosmic rays, Pierre Auger Observatory, extensive air showers, UHECR mass composition
Status publikacije:	Objavljeno
Verzija publikacije:	Objavljena publikacija
Leto izida:	2025
Št. strani:	8 str.
PID:	20.500.12556/RUNG-9950
COBISS.SI-ID:	230645763
UDK:	52
ISSN pri članku:	1824-8039
DOI:	10.22323/1.484.0041
NUK URN:	URN:SI:UNG:REP:WFXSTTVC
Datum objave v RUNG:	28.03.2025
Število ogledov:	303
Število prenosov:	6
Metapodatki:
:	FITOUSSI, Thomas, FILIPČIČ, Andrej, LUNDQUIST, Jon Paul, SHIVASHANKARA, Shima Ujjani, STANIČ, Samo, VOROBIOV, Serguei, ZAVRTANIK, Danilo in ZAVRTANIK, Marko, 2025, Mass composition of ultra-high-energy cosmic rays at the Pierre Auger Observatory. V : UHECR 2024, The 7th International Symposium on Ultra-High-Energy Cosmic Rays [na spletu]. Objavljeni znanstveni prispevek na konferenci. 2025. [Dostopano 13 april 2025]. Pridobljeno s: https://repozitorij.ung.si/IzpisGradiva.php?lang=slv&id=9950 Kopiraj citat

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Gradivo je del zbornika

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

Gradivo je del revije

Naslov:	Proceedings of science
Skrajšan naslov:	Pos proc. sci.
Založnik:	Sissa
ISSN:	1824-8039
COBISS.SI-ID:	20239655

Gradivo je financirano iz projekta

Financer:	ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
Številka projekta:	P1-0031
Naslov:	Večglasniška astrofizika

Licence

Licenca:	CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna

Povezava:	http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
Opis:	Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.