[{"content":"Overview #Neutrinos are electrically neutral, light fermions that undergo \u0026ldquo;oscillations\u0026rdquo;—inter-generational flavor transitions—during propagation. Precision measurements of these oscillation parameters provide crucial clues to physics beyond the Standard Model.\nDetails #We participate in long-baseline neutrino experiments to measure the mixing angles θ₁₃ and θ₂₃ and the CP-violation phase δ. Searches for CP violation are key to understanding the matter-dominated universe. We also develop calibration techniques for large water-Cherenkov detectors and advanced statistical analysis methods.\nRelated Facilities and Experiments # J-PARC (Japan Proton Accelerator Research Complex) Kamioka Observatory (Super-Kamiokande) ","date":null,"permalink":"https://www.isc.meiji.ac.jp/~niwase/en/research/theme-01/","section":"Research","summary":"","title":"Precision Measurement of Neutrino Oscillations"},{"content":"Overview #Dark matter accounts for approximately 27% of the mass-energy content of the universe, yet its nature remains unknown. We aim to directly detect interactions of WIMPs (Weakly Interacting Massive Particles), one of the leading dark matter candidates, using high-sensitivity detectors.\nDetails #We operate liquid-xenon detectors deep underground, where cosmic-ray backgrounds are minimal, searching for elastic scattering signals between WIMPs and atomic nuclei. Our group develops waveform analysis algorithms to distinguish signal from background events and performs precision calibrations of the electric-field response.\nRelated Facilities and Experiments # Kamioka Underground Laboratory (XENON-type experiments) Ultra-low-background material screening facility ","date":null,"permalink":"https://www.isc.meiji.ac.jp/~niwase/en/research/theme-02/","section":"Research","summary":"","title":"Direct Search for Dark Matter"},{"content":"","date":null,"permalink":"https://www.isc.meiji.ac.jp/~niwase/en/access/","section":"Access","summary":"","title":"Access"},{"content":"","date":null,"permalink":"https://www.isc.meiji.ac.jp/~niwase/en/members/","section":"Members","summary":"","title":"Members"},{"content":"The Sample University Particle Physics Experimental Laboratory explores the fundamental laws of the universe through experimental particle physics. [Sample Data] We conduct precision measurements of neutrino properties and direct searches for dark matter using large-scale accelerator experiments and underground detector facilities. From the development of state-of-the-art detector technologies to large-scale data analysis, our students and researchers tackle the frontiers of fundamental science together. By probing physics beyond the Standard Model, we aim to unravel the mysteries of the early universe.\n","date":null,"permalink":"https://www.isc.meiji.ac.jp/~niwase/en/","section":"Particle Physics Experimental Laboratory [Sample Data]","summary":"","title":"Particle Physics Experimental Laboratory [Sample Data]"},{"content":"","date":null,"permalink":"https://www.isc.meiji.ac.jp/~niwase/en/publications/","section":"Publications","summary":"","title":"Publications"},{"content":"","date":null,"permalink":"https://www.isc.meiji.ac.jp/~niwase/en/research/","section":"Research","summary":"","title":"Research"},{"content":"","date":null,"permalink":"https://www.isc.meiji.ac.jp/~niwase/en/tags/","section":"Tags","summary":"","title":"Tags"}]