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Colloquium: High Energy Particle Astrophysics at Penn State

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Miguel Mostafa, The Pennsylvania State University
13 October 2016 from 4:00 PM to 5:00 PM
117 Osmond Laboratory
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The Pierre Auger observatory is the largest cosmic ray detector ever
built. It was designed to detect the highest energy particles in the Universe, and
it has been taking data since 2004. Our published results range from the mea-
surement of the ux suppression at the highest energies to limits on ultra high
energy neutrinos, from limits on the ux of EeV neutrons from the galaxy to the
measurement of the proton-proton cross section at 57 TeV center-of-mass energy.
The High Altitude Water Cherenkov (HAWC) experiment is a large eld of
view, multi-TeV, gamma-ray observatory continuously operating at 14,000 ft since
March, 2015. The HAWC observatory has an order of magnitude better sensitivity,
angular resolution, and background rejection than the previous generation of water-
Cherenkov arrays. The improved performance allows us to discover TeV sources, to
detect transient events, to study the Galactic di use emission at TeV energies, and
to measure or constrain the TeV spectra of GeV gamma-ray sources. In addition,
HAWC is the only ground-based instrument capable of detecting prompt emission
from gamma-ray bursts above 100 GeV.
In this colloquium I will present the work of my group using more than ten
years of data from the Pierre Auger observatory, and the rst year of data from
the HAWC observatory. I will also brie y mention the exciting perspectives of
building a next-generation gamma-ray experiment at very high altitude in the
Southern Hemisphere.