Search

The CoMET is an R$\&$D project aiming to design a very-high-energy (VHE) gamma-ray observatory sensitive to energies above $\sim$ 200 GeV. The science goals include continuous observation of soft-spectrum VHE gamma-ray sources such as Active Galactic Nuclei (AGNs) and transients like Gamma-Ray Bursts (GRBs). With these objectives, CoMET is designed to have a low energy threshold with a wide field-of-view of about 2 sr, at a high altitude, and combines ALTO particle detectors with CLiC air-Cherenkov detectors. In this contribution, we focus on the ALTO particle detector array performance only. Water Cherenkov detectors are used for the detection of secondary particles in atmospheric air showers while scintillators serve as muon counters. A detailed study is presented through air-shower, detector and trigger simulations, followed by the reconstruction of the event parameters and the extraction of the signal (gamma-rays) from the background (cosmic-rays). We present the sensitivity of the ALTO detectors to a list of astrophysical sources using two SEMLA analysis configurations., 8 pages, 4 figures, Proceedings of the 37th International Cosmic Ray Conference (ONLINE ICRC2021), Berlin (Germany)

International audience; A review of future very large neutrino detectors for the measurement of neutrino oscillation pa- rameters is presented. Three main options are compared: the water cherenkov technology, as in Hyper-Kamiokande, the liquid argon technology, as in DUNE, and the liquid scintillator technology, as in JUNO. The prospects, the advantages and the weaknesses of each technology will be addressed.

International audience; After measuring in 2012 a relatively large value of the neutrino mixing angle $\theta_{13}$, the door is now open to observe for the first time a possible CP violation in the leptonic sector.The measured value of $\theta_{13}$ also privileges the 2nd oscillation maximum for the discovery of CP violation instead of the usually used 1st oscillation maximum.The sensitivity at this 2nd oscillation maximum is about three times higher than for the 1st oscillation maximum inducing a lower influence of systematic errors.Going to the 2nd oscillation maximum necessitates a very intense neutrino beam with the appropriate energy.The world's most intense pulsed spallation neutron source, the European Spallation Source, will have a proton linac with 5~MW power and 2~GeV energy.This linac, under construction, has the potential to become the proton driver of the world's most intense neutrino beam with very high potential to discover a neutrino CP violation.The physics performance of that neutrino Super Beam in conjunction with a megaton underground Water Cherenkov neutrino detector installed at a distance of about 500~km from ESS has been evaluated.In addition, the choice of such detector will extent the physics program to proton--decay, atmospheric neutrinos and astrophysics searches.The ESS proton linac upgrades, the accumulator ring needed for proton pulse compression, the target station optimization and the physics potential are described.In addition to neutrinos, this facility will also produce at the same time a copious number of muons which could be used by a low energy nuSTORM facility, a future Neutrino Factory or a muon collider.The ESS neutron facility will be fully ready by 2023 at which moment the upgrades for the neutrino facility could start.This project is now supported by the COST Action CA15139 ``Combining forces for a novel European facility for neutrino-antineutrino symmetry-violation discovery'' (EuroNuNet).