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Physical review letters · 2025

Inference of the Mass Composition of Cosmic Rays with Energies from 10^{18.5} to 10^{20}  eV Using the Pierre Auger Observatory and Deep Learning.

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Abdul Halim A, Abreu P, Aglietta M, Allekotte I, Almeida Cheminant K, Almela A, Aloisio R, Alvarez-Muñiz J, Ammerman Yebra J, Anastasi G A, Anchordoqui L, Andrada B, Andrade Dourado L, Andringa S, Apollonio L, Aramo C, Araújo Ferreira P R, Arnone E, Arteaga Velázquez J C, Assis P, Avila G, Avocone E, Bakalova A, Barbato F, Bartz Mocellin A, Berat C, Bertaina M E, Bhatta G, Bianciotto M, Biermann P L, Binet V, Bismark K, Bister T, Biteau J, Blazek J, Bleve C, Blümer J, Boháčová M, Boncioli D, Bonifazi C, Bonneau Arbeletche L, Borodai N, Brack J, Brichetto Orchera P G, Briechle F L, Bueno A, Buitink S, Buscemi M, Büsken M, Bwembya A, Caballero-Mora K S, Cabana-Freire S, Caccianiga L, Campuzano F, Caruso R, Castellina A, Catalani F, Cataldi G, Cazon L, Cerda M, Čermáková B, Cermenati A, Chinellato J A, Chudoba J, Chytka L, Clay R W, Cobos Cerutti A C, Colalillo R, Coluccia M R, Conceição R, Condorelli A, Consolati G, Conte M, Convenga F, Correia Dos Santos D, Costa P J, Covault C E, Cristinziani M, Cruz Sanchez C S, Dasso S, Daumiller K, Dawson B R, de Almeida R M, de Errico B, de Jesús J, de Jong S J, de Mello Neto J R T, De Mitri I, de Oliveira J, de Oliveira Franco D, de Palma F, de Souza V, De Vito E, Del Popolo A, Deligny O, Denner N, Deval L, di Matteo A, do J A, Dobre M, Dobrigkeit C, D'Olivo J C, Domingues Mendes L M, Dorosti Q, Dos Anjos J C, Dos Anjos R C, Ebr J, Ellwanger F, Emam M, Engel R, Epicoco I, Erdmann M, Etchegoyen A, Evoli C, Falcke H, Farrar G, Fauth A C, Fehler T, Feldbusch F, Fenu F, Fernandes A, Fick B, Figueira J M, Filip P, Filipčič A, Fitoussi T, Flaggs B, Fodran T, Fujii T, Fuster A, Galea C, García B, Gaudu C, Gherghel-Lascu A, Ghia P L, Giaccari U, Glombitza J, Gobbi F, Gollan F, Golup G, Gómez Berisso M, Gómez Vitale P F, Gongora J P, González J M, González N, Góra D, Gorgi A, Gottowik M, Guarino F, Guedes G P, Guido E, Gülzow L, Hahn S, Hamal P, Hampel M R, Hansen P, Harari D, Harvey V M, Haungs A, Hebbeker T, Hojvat C, Hörandel J R, Horvath P, Hrabovský M, Huege T, Insolia A, Isar P G, Janecek P, Jilek V, Johnsen J A, Jurysek J, Kampert K-H, Keilhauer B, Khakurdikar A, Kizakke Covilakam V V, Klages H O, Kleifges M, Knapp F, Köhler J, Krieger F, Kunka N, Lago B L, Langner N, Leigui de Oliveira M A, Lema-Capeans Y, Letessier-Selvon A, Lhenry-Yvon I, Lopes L, Lu L, Luce Q, Lundquist J P, Machado Payeras A, Majercakova M, Mandat D, Manning B C, Mantsch P, Mariani F M, Mariazzi A G, Mariş I C, Marsella G, Martello D, Martinelli S, Martínez Bravo O, Martins M A, Mathes H-J, Matthews J, Matthiae G, Mayotte E, Mayotte S, Mazur P O, Medina-Tanco G, Meinert J, Melo D, Menshikov A, Merx C, Michal S, Micheletti M I, Miramonti L, Mollerach S, Montanet F, Morejon L, Mulrey K, Mussa R, Namasaka W M, Negi S, Nellen L, Nguyen K, Nicora G, Niechciol M, Nitz D, Nosek D, Novotny V, Nožka L, Nucita A, Núñez L A, Oliveira C, Palatka M, Pallotta J, Panja S, Parente G, Paulsen T, Pawlowsky J, Pech M, Pȩkala J, Pelayo R, Pelgrims V, Pereira L A S, Pereira Martins E E, Pérez Bertolli C, Perrone L, Petrera S, Petrucci C, Pierog T, Pimenta M, Platino M, Pont B, Pothast M, Pourmohammad Shahvar M, Privitera P, Prouza M, Querchfeld S, Rautenberg J, Ravignani D, Reginatto Akim J V, Reininghaus M, Reuzki A, Ridky J, Riehn F, Risse M, Rizi V, Rodrigues de Carvalho W, Rodriguez E, Rodriguez Rojo J, Roncoroni M J, Rossoni S, Roth M, Roulet E, Rovero A C, Saftoiu A, Saharan M, Salamida F, Salazar H, Salina G, Sanabria Gomez J D, Sánchez F, Santos E M, Santos E, Sarazin F, Sarmento R, Sato R, Savina P, Schäfer C M, Scherini V, Schieler H, Schimassek M, Schimp M, Schmidt D, Scholten O, Schoorlemmer H, Schovánek P, Schröder F G, Schulte J, Schulz T, Sciutto S J, Scornavacche M, Sedoski A, Segreto A, Sehgal S, Shivashankara S U, Sigl G, Simkova K, Simon F, Smau R, Šmída R, Sommers P, Squartini R, Stadelmaier M, Stanič S, Stasielak J, Stassi P, Strähnz S, Straub M, Suomijärvi T, Supanitsky A D, Svozilikova Z, Szadkowski Z, Tairli F, Tapia A, Taricco C, Timmermans C, Tkachenko O, Tobiska P, Todero Peixoto C J, Tomé B, Torrès Z, Travaini A, Travnicek P, Tueros M, Unger M, Uzeiroska R, Vaclavek L, Vacula M, Valdés Galicia J F, Valore L, Varela E, Vašíčková V, Vásquez-Ramírez A, Veberič D, Vergara Quispe I D, Verzi V, Vicha J, Vink J, Vorobiov S, Watanabe C, Watson A A, Weindl A, Wiencke L, Wilczyński H, Wittkowski D, Wundheiler B, Yue B, Yushkov A, Zapparrata O, Zas E, Zavrtanik D, Zavrtanik M, Pierre Auger Collaboration

Аннотация

We present measurements of the atmospheric depth of the shower maximum X_{max}, inferred for the first time on an event-by-event level using the surface detector of the Pierre Auger Observatory. Using deep learning, we were able to extend measurements of the X_{max} distributions up to energies of 100 EeV (10^{20}  eV), not yet revealed by current measurements, providing new insights into the mass composition of cosmic rays at extreme energies. Gaining a 10-fold increase in statistics compared to the fluorescence detector data, we find evidence that the rate of change of the average X_{max} with the logarithm of energy features three breaks at 6.5±0.6(stat)±1(syst)  EeV, 11±2(stat)±1(syst)  EeV, and 31±5(stat)±3(syst)  EeV, in the vicinity to the three prominent features (ankle, instep, suppression) of the cosmic-ray flux. The energy evolution of the mean and standard deviation of the measured X_{max} distributions indicates that the mass composition becomes increasingly heavier and purer, thus being incompatible with a large fraction of light nuclei between 50 and 100 EeV.

ИП Урсолов Владлен Сергеевич

ИНН 500118482352 · ОГРНИП 314500117700049

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