Speaker
Dr
Quanbu Gou
(Institute of High Energy Physics, CAS)
Description
High-energy transients, e.g., gamma-ray bursts (GRBs), supernovae, and blazars, are potential sources of high-energy cosmic rays. Neutrinos are a good probe of the origin of cosmic rays.
Horizontal air showers (HAS) are expected to be initiated by deeply penetrating high en-ergy particles such as neutrinos. Indeed, at large zenith angles the electromagnetic com-ponent of ordinary air showers should be attenuated by the atmosphere well before reaching the ground level and the muon component is expected to dominate the second-ary particles. Neutrino candidate events, on the contrary, are expected to be like the elec-tromagnetic showers, with a small muon content. Measuring the muon content provides a method to discriminate between showers, then to tag neutrino candidate events.
The LHAASO-KM2A is constituted by a large array of both electromagnetic and under-ground muon detectors, with unprecedented total sensitive area (greater than 40,000 m2).
In this talk I show the first results of HAS with the half array of LHAASO-KM2A, including the zenith angle distribution of extensive air showers and the transition from electromag-netic-dominated showers to muon-dominated ones above a zenith angle of 60 deg.
Primary author
Dr
Quanbu Gou
(Institute of High Energy Physics, CAS)
