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SUMMARY:Beyond Protons: Multimessenger Imprints of Heavy Nuclei in High-En
 ergy Neutrino Sources
DTSTART:20260702T090000Z
DTEND:20260702T100000Z
DTSTAMP:20260703T110300Z
UID:indico-event-39886@indico.in2p3.fr
CONTACT:seminars@lapth.cnrs.fr
DESCRIPTION:Speakers: AmirFarzan Esmaeili\n\nJoint neutrino and gamma-ray 
 observations offer a powerful probe of the physical conditions in high-ene
 rgy astrophysical sources\, including their size\, particle densities\, an
 d acceleration and production mechanisms. Yet the composition of the accel
 erated nuclei remains largely unknown. If heavy nuclei are present in comp
 act\, photon-rich regions\, they can photodisintegrate\, undergo Bethe-Hei
 tler pair production and photomeson interactions\, and initiate nuclear an
 d electromagnetic cascades before escaping the source.\nIn this talk\, I w
 ill discuss how these processes reshape the neutrino and gamma-ray output 
 of high-energy neutrino sources. Using detailed Monte Carlo simulations\, 
 I will show how the interplay of nuclear fragmentation\, Bethe-Heitler ene
 rgy losses\, and photomeson production modifies the multimessenger signal.
  I will then apply this framework to NGC 1068\, one of the few extragalact
 ic objects with evidence for high-energy neutrino emission\, and discuss h
 ow MeV-GeV gamma-ray observations\, including a dedicated re-analysis of a
 rchival COMPTEL data\, can constrain the injected nuclear composition.\n\n
 https://indico.in2p3.fr/event/39886/
LOCATION:Salle des Sommets (LAPTh)
URL:https://indico.in2p3.fr/event/39886/
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