Category: Research

XENON Collaboration Kobayashi-Maskawa Institute (KMI), Nagoya University Institute for Space-Earth Environmental Research (ISEE), Nagoya University Graduate School of Science, Kobe University School of Science, Institute of Science Tokyo Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI), The University of Tokyo Institute for Cosmic Ray Research (ICRR), The University of Tokyo Every second, tens of billions of neutrinos produced by nuclear fusion in the Sun pass through every square centimetre of the Earth – and through …

Nagoya University, through the Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI), is contributing to the realization of the SKA Regional Centre Network (SRCNet), the international infrastructure that will support data from the Square Kilometre Array Observatory (SKAO), the world’s largest radio interferometer. The SKA1 Sub-Project (SKAJ) at the National Astronomical Observatory of Japan (NAOJ) Mizusawa VLBI Observatory, together with NEC Corporation, succeeded in a large-volume data transfer test over an ultra-long-haul network spanning half the globe, …

The Belle II experiment reached a major milestone on May 17, 2025, by accumulating the world’s largest dataset of B mesons. This achievement surpasses the record set by its predecessor, the Belle experiment. By utilizing “clean” electron–positron annihilation processes (in which few additional particles are produced), Belle II can probe signs of new physics beyond the Standard Model with unprecedented precision. Looking ahead, the research team will continue to increase the dataset and refine the experimental apparatus, aiming to open …

In the global search for dark matter, the XENONnT experiment at the INFN Laboratori Nazionali del Gran Sasso (LNGS) stands out as one of the world’s most sensitive detectors in the field. This international collaboration, comprising over 190 scientists from 30 institutions worldwide, has achieved a major technological breakthrough: a significant reduction in radioactive background noise, a feat never previously achieved in rare-event physics experiments. The core of this innovation is a cryogenic distillation system that purifies the liquid xenon …

The XENON collaboration is an international collaboration between the United States, Europe and Japan, involving the KMI and ISEE at the Nagoya University, the Kavli IPMU, WPI at the University of Tokyo, the Institute for Cosmic Ray Research at the University of Tokyo and Kobe University. The collaboration has observed for the first time the scattering of neutrinos and xenon nuclei produced by the Sun in the XENONnT experiment, a dark matter search experiment currently in operation. The results were …

The J-PARC muon g-2/EDM experimental group, which includes Professor Toru Iijima, Designated Lecturer Kazuhito Suzuki, Associate Professor Kenji Inami, and graduate students Kazuji Sumi, Koichi Ueda, and Ayaka Kondo, has successfully cooled and accelerated positively charged muons for the first time in the world. This achievement marks a major step toward launching an ultra-precise verification of the Standard Model. Additionally, a completely new imaging technique using accelerated muons is being considered for various applications, including muon microscopy and interdisciplinary research …

Abstract Our groups, led by Associate Professor Kazuhiro Nakazawa at Nagoya University/KMI and first-year Ph.D. student Yuki Omiya at the Graduate School of Science, in collaboration with a research team led by Project Researcher Kohei Kurahara at the Mizusawa VLBI Observatory, National Astronomical Observatory of Japan (NAOJ), discovered an extended radio emission in the Hydra cluster, about 150 million light-years away. Galaxy clusters are the largest self-gravitating objects in the Universe, surrounded by hot gas, magnetic fields, and cosmic rays …

Abstract Our group led by Associate Professor Kazuhiro Nakazawa at Nagoya University/KMI, and doctoral course student Yuki Omiya at the Graduate School of Science, in collaboration with the National Astronomical Observatory of Japan, Tokyo University of Science, Hiroshima University, Saitama University, JAXA Institute of Space and Astronautical Science, Tokyo Metropolitan University, Netherlands Institute for Space Sciences, and Toho University, succeeded in estimating the length, width, depth, and merging velocity of the shock wave just born in the nearby merging galaxy …

The values of fundamental constants of nature, dubbed as physical constants, might be affected by new elementary particles and unknown forces of nature, according to a study by an international group of researchers that includes Designated Assistant Professor Teppei Kitahara at KMI and Institute for Advanced Research, Nagoya University and at IPNS, KEK (cross appointment). The findings were published in the journal Physical Review Letters. Scientists continuously strive to develop and refine theories that explain the world and the universe …

The FASER collaboration (ForwArd Search ExpeRiment at the LHC; FASER) reported that the FASER detector has achieved observations accurate enough to detect the presence of neutrinos produced at the collider. Established in 2017, the FASER experiment aims to discover elementary particles that could contribute to a better understanding of dark matter, as well as to study neutrinos in the unexplored high-energy region to explore the unknown physical laws behind the Standard Model of elementary particles. The experiment focuses on secondary …