Radiation Portal Monitors (RPMs) are highly sensitive fixed installation systems designed to detect illicit radioactive material trafficking. RPMs are typically installed with detectors that have a high detection efficiency, such as plastic detectors. However, due to these detectors' limited energy resolution, radioisotope identification from their spectra is often not of interest. This...
A gas detector with a size of 140×140×140 mm$^3$, named the Compact Active Target Time Projection Chamber (CAT-TPC), has been developed aiming to measure resonant scattering associated with cluster structures in unstable nuclei. The CAT-TPC consists of an electronic field cage, double thick gas-electron-multiplier foils, a general purpose digital data acquisition system, and especially a newly...
The GRAMS (Gamma-Ray and AntiMatter Survey) project that aims to observe MeV gamma rays and to search for dark matter at the same time started in 2021 on full scale. The MeV gamma-ray region is important for understanding phenomena in the universe such as nucleosynthesis and high-energy particle acceleration. The detector for the project is a large LArTPC (Liquid Argon Time Projection Chamber)...
The nuclear matter compressibility ($K_{\tau}$) is an important physical quantity that can directly determine a part of the equation of state of nuclear matter. In order to determine $K_{\tau}$ with high accuracy, it is indispensable to determine the compressibility of many nuclei ($K_{\mathrm{A}}$). We have been developing an active target CAT-M for the purpose of systematic measurement of an...
The existence of the permanent Electric Dipole Moment (EDM) implies the time reversal symmetry violation. This violation directly means CP violation by the CPT theorem, and it would be expected to explain the observed matter-antimatter asymmetry.
The T-violation predicted by the Standard Model (SM) of particle physics for the electron EDM is too small to be measured with current experimental...
