The NOPTREX International Collaboration Workshop 2025 was successfully held from January 4 to 5 at CSNS. The event attracted over 50 experts and scholars from institutions such as Indiana University (USA), Nagoya University (Japan), the Japan Spallation Neutron Source (JSNS), the University of Science and Technology of China, Sun Yat-sen University, Shandong University, the Great Bay University (under preparation), the China Institute of Atomic Energy, Ningbo University, Henan University, the Technical Institute of Physics and Chemistry (CAS), the Xi'an Institute of Optics and Precision Mechanics (CAS), and the Institute of High Energy Physics (CAS). Research progress were shared during the two-day event.
NOPTREX stands for "Neutron Optics Parity and Time Reversal Experiment." The collaboration currently has over 100 members from universities and research institutions across 36 countries and regions, including China, the United States, Japan, Mexico, Switzerland, Germany, the United Kingdom, Canada, and South Korea. The collaboration focuses on searching for parity and time-reversal symmetry violations in neutron-nucleus resonance reactions. It is the only global research group dedicated to exploring parity nonconservation and time-reversal asymmetry in neutron-nucleus (NN) interactions. Such symmetry violations in NN interactions represent new physics beyond the Standard Model. If discovered, these effects could help explain the matter-antimatter asymmetry in the universe and open up entirely new directions in physics research.
Currently, NOPTREX's experiments involve five neutron sources worldwide: the China Spallation Neutron Source (CSNS), the Japan Proton Accelerator Research Complex (J-PARC), the Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II) in Germany, the Los Alamos Neutron Science Center (LANSCE) in the U.S., and the Spallation Neutron Source (SNS) in the U.S. In the future, the collaboration also plans to conduct experiments at the European Spallation Source, which is currently under construction.
Group photo
