[Seminar] Dr. Koun Choi (Université Libre de Bruxelles, IIHE), July 14th, 2020.

We are delighted to announce that we will have an Astroparticle Physics Seminar talk given by Dr. Koun Choi from Université Libre de Bruxelles, IIHE on July 14th. Please join and welcome her talk together.

This seminar will be held virtually via ZOOM teleconference due to the recommended social distancing in Korea over the current coronavirus situation. Please contact Prof. Rott to get the detail connection information beforehand to join the seminar.


Title: Overview of recent Auger activities focusing on UHE neutrinos

Speaker: Dr. Koun Choi (Université Libre de Bruxelles, IIHE)

Date & Time: Tuesday, July 14th, 2020. 16:00 KST (9:00 CEST)

Place: Virtual (via ZOOM)


The Pierre Auger Observatory is the largest air-shower detector ever built. It employs a hybrid technique combining a surface detector consisting of 1664 water-Cherenkov stations and a fluorescence detector composed of 27 Schmidt telescopes. The observatory has collected data since 2004, making up the world’s largest exposure to ultra-high energy cosmic rays with energy up to 10^{20.2} eV.
Neutrino search in the ultra-high energy range is becoming increasingly important in the new era of multi-messenger astrophysics. The Pierre Auger Observatory can effectively search for cosmogenic neutrinos that are produced by ultra-high energy cosmic ray interactions with the CMB, benefitting from its large exposure. Being electrically neutral, neutrinos point back to their origin while charged cosmic rays are deflected by galactic and extra-galactic magnetic fields. Using its good angular resolution, the Pierre Auger Observatory can do follow-up search for astrophysical events such as gravitational waves, observed by the LIGO/Virgo detectors.
In this talk, I will present some of the most recent results of the Pierre Auger Observatory, including the upper-end of the energy spectrum of cosmic rays, latest analyses of the mass composition and arrival direction of cosmic rays. I will also show the latest limit to the diffuse flux of ultra-high energy neutrinos and the result of the search for neutrinos from black hole mergers.
[Seminar] Dr. Koun Choi (Université Libre de Bruxelles, IIHE), July 14th, 2020.