Neutrinos are the most abundant know particle with mass in our Universe. Despite their abundance, our knowledge about neutrinos remains incomplete. For example, we do not know any of the masses of the three neutrinos – a unique quantity of fundamental particles! Furthermore, whether neutrinos are Dirac or Majorana fermions remains an unresolved question in particle physics with fundamental...
A key background in rare-event search experiments is the cosmogenic background. Hosting experiments in deep-underground laboratories can mitigate this background to some extent; however, high-energy muons can still reach these locations. An active muon veto system can tag signals from the passage of muons in the detector and exclude them from the data analysis. The nEXO experiment,...
We have developed 3D integrated Photon-to-Digital Converters (PDC) as an improved alternative to PMTs and SiPMs for photon counting in various radiation applications, particularly for low power consumption in large area systems such as noble liquid dark matter and neutrino searches, or fast neutron spectroscopy.
In previous years we reported on the architecture, the fabrication process, the...
The Hyper-Kamiokande (Hyper-K) project aims to measure neutrino oscillations with unprecedented precision which may answer fundamental questions underlying CP violation in the lepton sector. Minimizing systematic uncertainties is now more important than ever, making prototype experiments such as the Water Cherenkov Test Experiment (WCTE) at CERN essential. WCTE is designed to test photosensor...
The Hyper-Kamiokande (Hyper-K) far detector is under construction and is planned to begin operation in 2027. The detector will consist of a cylindrical water tank measuring 68 metres in diameter and 72 metres in height, instrumented with 40,000 inward-facing 50-cm photomultiplier tubes (PMTs). To enhance calibration capabilities, 1000 of the conventional PMTs will be replaced by multi-PMT...
