Séminaire Doctorants / Seminar PhD students |
| « Hybrid radio and particle detection of air showers: potential for ultra-high-energy gamma-ray identification » |
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Paul Minodier |
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Ultra-high-energy (UHE) gamma-rays are photons with energies higher than 0.1 PeV, produced through interactions between UHE cosmic rays and either interstellar matter or background radiation fields (like the CMB or the EBL). Their existence was confirmed by the LHAASO experiment in 2019 and a 2.5 PeV gamma ray was detected in 2024. Several experiments have been searching for gamma-rays at even higher energies, like the Pierre Auger Observatory and the Telescope Array experiment, without any clear detection to this day.
The Giant Radio Array for Neutrino Detection (GRAND), currently in its prototyping phase, detects extensive air showers (EAS) initiated by UHE particles using radio antennas. Supplementing these antennas with scintillation detectors could enable GRAND to serve as a competitive UHE gamma-ray detector. In this talk, I will present a method to distinguish cosmic-ray and gamma-ray showers, using a hybrid array of radio antennas and scintillation detectors, and apply it to the prototype of GRAND, GRANDProto300 as a case study. |
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vendredi 30 janvier 2026 - 16:00 Salle des séminaires Évry Schatzman, Institut d'Astrophysique |
| Page web du Séminaire / Seminar's webpage |