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A group of researchers, including scientists from Nagoya University, the High Energy Accelerator Research Organization (KEK), the University of Tokyo, Kyoto University, Kyushu University, Osaka Electro-Communication University, Tsukuba University, and Osaka University, reported the first result of neutron lifetime measurement by adopting a new experimental technique. Neutrons are one of the particles that constitute the nuclei of atoms. Neutron decay is related to the mechanism of synthesis of elements in the early universe and particle physics. This result paves a …


A group of researchers including scientists from Nagoya University, the J-PARC Center, Tokyo Institute of Technology, Osaka University, Kyushu University, and Japan Atomic Energy Agency study the angular distribution of gamma-rays emitted from a neutron capture reaction with polarized neutrons. This is the basis of CP-violation research experiments using nuclear reactions. In particle physics CP-violation is one of the origins of the matter universe; however, only tiny violations have thus far been observed. Unknown CP-violating processes are sought through various …