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SUMMARY:Do we hear heavy-metal of cosmic rays at the highest energies ?
DTSTART:20260521T120000Z
DTEND:20260521T130000Z
DTSTAMP:20260530T225400Z
UID:indico-event-336@indico.fzu.cz
DESCRIPTION:Speakers: Jakub Vícha (FZU)\n\nAbstract: \n\nThe origin of t
 he most energetic cosmic rays is a long-lasting mystery that has been main
 ly obscured by uncertainties in their mass composition arising from the mo
 delling of hadronic interactions in the extensive air showers that these p
 articles induce. For some time now\, discrepancies between the model predi
 ctions and measured air-shower data have been complicating efforts to find
  a consistent mass-composition scenario of ultra-high-energy cosmic rays (
 UHECR\, above 1018 eV). A deficit of the simulated signal relative to the 
 measured signal in ground detectors is an inconsistency (also known as th
 e muon puzzle) that is usually interpreted as a deficit of the muon signa
 l induced by the hadronic component of a simulated shower. Recent advances
  in testing models of hadronic interactions revealed a new problem in the 
 predicted depth of the shower maximum\, which is usually considered as the
  best estimator of the cosmic-ray mass. After a brief introduction into UH
 ECR\, I will review the tests of models of hadronic interactions using the
  Pierre Auger Observatory data that imply a very heavy mass composition at
  the highest energies. Finally\, I will introduce an extreme Heavy-metal s
 cenario of UHECR assuming pure iron nuclei in the cosmic-ray flux-suppress
 ion region (above 1019.6 eV). Surprisingly\, such a scenario might be a vi
 able option in the nature given the recent advances in the air-shower mode
 lling.\n \n\n \nThe seminar will be held in the Dvořák hall\, FZU\, Po
 d Vodárenskou věží 1\, Prague.\nLocation: https://goo.gl/maps/wEf7PsiL
 imSXMZhE9\n \nThe seminar will be also available via ZOOM video conferenc
 e system:\nMeeting ID: 674 9629 6646Passcode: 575511\nor join meeting via 
 direct ZOOM link\n \n\nhttps://indico.fzu.cz/event/336/
URL:https://indico.fzu.cz/event/336/
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