Speaker
Description
JSNS2 (J-PARC Sterile Neutrino Search at the J-PARC Spallation Neutron Source) is a neutrino oscillation experiment with 24m of baseline, targeting Δm² values near 1 eV². To investigate the LSND anomaly directly, the same neutrino source, the same neutrino target, and the same interaction are used. At the J-PARC Material and Life Science Facility, 3 GeV protons produce the neutrino beam via muon decay at rest. These neutrinos interact via inverse beta decay with the neutrino target. The neutrino target is 17tons of Gd-loaded liquid scintillator with 10% of DIN for PSD improvement. In 2021, JSNS2 started the physics run and continued data-taking. In addition, as a second phase of JSNS2, we are commissioning, including the far detector with 48m baselie. The far detector has been completed and is currently being commissioned and performing calibration. Several commissioning activities are in progress, including nitrogen purging of the Gd-loaded liquid scintillator to remove oxygen, installation of a level stabilizer system to maintain a stable liquid scintillator height, and the development of a specific trigger to efficiently identify the physics events. In this presentation, the recent status of JSNS2-II will be shown.
