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PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-8919
DTSTART:20241009T160000Z
DTEND:20241009T180000Z
DTSTAMP:20260413T223407Z
LAST-MODIFIED:20241008T212930Z
LOCATION:5280 Chamberlin Hall or https://uwmadison.zoom.us/j/948985159
 49
SUMMARY:Connecting Multimessenger Observations to Theory in Particle A
 strophysics from GeV to EeV\, Preliminary Exam\, Angelina Partenheimer
 \, Physics PhD Graduate Student
DESCRIPTION:In my preliminary exam\, I will discuss my paper on ultrah
 igh energy cosmic rays from gamma-ray sources. Ultra-high-energy cosmi
 c rays (UHECRs) are the highest-energy particles ever observed. While 
 the sources producing UHECRs are still unknown\, the Pierre Auger Obse
 rvatory has detected a large-scale dipole anisotropy in the arrival di
 rections of cosmic rays above 8 EeV. My project explores whether resol
 ved gamma-ray sources can reproduce the Auger dipole. I find that in a
 ll cases\, the simulated dipole has an amplitude significantly larger 
 than that measured by Auger\, implying that the resolved gamma-ray sou
 rces are insufficient to account for the population of sources produci
 ng the highest-energy cosmic rays. Next\, I will discuss my recent pro
 ject on prospects of detecting GeV transients with IceCube DeepCore an
 d Upgrade. A wide variety of transient sources have been predicted to 
 emit GeV neutrinos. In light of the upcoming IceCube-Upgrade\, which w
 ill extend the IceCube detector’s sensitivity down to a few GeV\, I 
 survey a variety of transient source models and compare the prediction
 s and detector sensitivities. Finally\, I will briefly discuss my inte
 nded thesis work\, which involves using anticipated UHE neutrino data 
 from the Payload for Ultrahigh Energy Observations balloon experiment 
 to constrain the UHECR proton composition.
URL:https://www.physics.wisc.edu/events/?id=8919
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