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SUMMARY:Limiting the number density of ultra-high-energy cosmic ray source
 s
DTSTART;VALUE=DATE-TIME:20261030T143000Z
DTEND;VALUE=DATE-TIME:20261030T144500Z
DTSTAMP;VALUE=DATE-TIME:20261103T142543Z
UID:indico-contribution-6218@cern.ch
DESCRIPTION:Speakers: Pavliuk Anastasia (MIPT\, LPI\, JNR)\nThe origin of 
 ultra-high-energy cosmic rays (UHECRs) remains an open problem. In particu
 lar\, the properties of their sources are difficult to constrain due to th
 e limited statistics of observed events and the propagation effects experi
 enced by charged cosmic rays. One of the important characteristics of sour
 ces is their number density. In this work\, we investigate the possibility
  of constraining the number density of UHECR sources using statistical pro
 perties of experimentally observed cosmic-ray events.\n\nThe analysis is b
 ased on public data from the Pierre Auger Observatory. We simulate UHECR e
 vents as they would be observed at Earth for different assumptions about t
 he primary composition\, source number density\, and energy threshold. For
  each set of parameters\, ensembles of simulated event sets are generated 
 and compared with the experimental data. The simulations account for the m
 ain effects relevant to the propagation and detection of UHECRs.\n\nSevera
 l statistical methods are used to quantify the compatibility between the s
 imulated event sets and the experimental data. In particular\, we consider
  the two-point angular autocorrelation function\, which characterizes the 
 clustering of events on different angular scales. The distributions of the
  corresponding statistics obtained from the simulated event sets are compa
 red with the values measured in the experimental data. \n\nThe preliminary
  results show that\, for most of the considered primary compositions and e
 nergy thresholds\, the simulated event sets are inconsistent with the expe
 rimental data across the investigated range of source densities.\n\nhttps:
 //indico.particle.mephi.ru/event/626/contributions/6218/
LOCATION: Conference Hall 4
URL:https://indico.particle.mephi.ru/event/626/contributions/6218/
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