A5053478172- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Quantum, superfluid, helium dynamics
- Nuclear reactor physics and engineering
- Cold Atom Physics and Bose-Einstein Condensates
- Radiation Therapy and Dosimetry
- Boron Compounds in Chemistry
- Dark Matter and Cosmic Phenomena
- Particle accelerators and beam dynamics
- Advanced MRI Techniques and Applications
- High-pressure geophysics and materials
- Particle physics theoretical and experimental studies
- NMR spectroscopy and applications
- Radioactivity and Radon Measurements
- Advanced Frequency and Time Standards
- Nuclear physics research studies
- Random lasers and scattering media
- Magnetic confinement fusion research
- Nuclear Materials and Properties
- Neutrino Physics Research
- Relativity and Gravitational Theory
- Cosmology and Gravitation Theories
- Pulsars and Gravitational Waves Research
- Advanced NMR Techniques and Applications
High Energy Accelerator Research Organization
2020-2025
Japan Proton Accelerator Research Complex
2020-2024
Institute of Materials Structure Science
2022-2024
Kyoto University
2017-2022
Obayashi (Japan)
2022
Kyushu University
2022
Nagoya University
2014-2022
North Carolina State University
2022
Tohoku University
2022
Japan Atomic Energy Agency
2022
The violation of Baryon Number, $\mathcal{B}$, is an essential ingredient for the preferential creation matter over antimatter needed to account observed baryon asymmetry in universe. However, such a process has yet be experimentally observed. HIBEAM/NNBAR %experiment program proposed two-stage experiment at European Spallation Source (ESS) search number violation. will include high-sensitivity searches processes that violate by one or two units: free neutron-antineutron oscillation...
Ultracold neutrons (UCNs) can be bound by the potential of terrestrial gravity and a reflecting mirror. The wave function state has characteristic modulations. We carried out an experiment to observe vertical distribution UCNs above such mirror at Institut Laue-Langevin in 2011. observed modulation is good agreement with that prediction quantum mechanics using Wigner function. spatial resolution detector system estimated 0.7 micro meter. This first observation gravitationally states...
This study entailed the successful deployment of a novel neutron interferometer that utilizes multilayer mirrors. The apparatus facilitates precise evaluation wavelength dependence interference fringes utilizing pulsed source. Our achieved an impressive precision 0.02 rad within 20-min recording time. Compared to systems using silicon crystals, measurement sensitivity was maintained even when simplified disturbance suppressor. By segregating beam paths entirely, we measurements...
Abstract To solve the “neutron lifetime puzzle,” where measured neutron lifetimes differ depending on measurement methods, an experiment with a pulsed beam at J-PARC is in progress. In this experiment, neutrons are bunched into 40-cm lengths using spin flip chopper (SFC), statistical sensitivity was limited by aperture size of SFC. The SFC comprises three sets magnetic supermirrors and two resonant flippers. paper, we discuss upgrade to enlarge apertures With upgrade, statistics per unit...
We developed a thermal neutron source for performance tests of boron agents Boron Neutron Capture Therapy (BNCT) at exposure Accelerator System Biological Effect Experiments (NASBEE) in National Institute Radiological Sciences, Japan. The flux the experimental position was measured to be 2.18× 108 n/cm2/s, cadmium ratio 9.21, and gamma ray dose rate 2.11 Gy/h. estimated 2.96 These values indicate that can applicable although application range is limited. An example irradiation experiment described.
Abstract Hypothetical short-range interactions could be detected by measuring the wavefunctions of gravitationally bound ultracold neutrons (UCNs) on a mirror in Earth's gravitational field. Searches for them with higher sensitivity require detectors spatial resolution. We developed and have been improving an UCN detector high resolution, which consists Si substrate, thin converter layer including ^10B_4C, fine-grained nuclear emulsion. Its resolution was estimated to less than 100 nm...
The neutron lifetime has been measured by comparing the decay rate with reaction of $^3$He nuclei a pulsed beam from spallation source at Japan Proton Accelerator Research Complex (J-PARC). and were determined simultaneously detecting electrons protons $^3$He(n,p)$^3$H using gas chamber which working contains diluted $^3$He. was $898\,\pm\,10\,_{\rm stat}\,^{+15}_{-18}\,_{\rm sys}\,$s.
A neutron detector using a fine-grained nuclear emulsion has sub-micron spatial resolution and thus potential to be applied as high-resolution imaging. In this paper, we present two approaches applying the detectors for One is track analysis derive reaction points high resolution. From an image obtained with 9 μm pitch Gd grating cold neutrons, periodic peak standard deviation of 1.3 was observed. The other approach without high-density irradiation. An internal structure crystal oscillator...
A neutron decays into a proton, an electron, and anti-neutrino through the beta-decay process. The decay lifetime ($\sim$880 s) is important parameter in weak interaction. For example, used to determine |$V_{\rm ud}$| of CKM quark mixing matrix. also one input parameters for Big Bang Nucleosynthesis, which predicts light element synthesis early universe. However, experimental measurements today are significantly different (8.4 s or 4.0$\sigma$) depending on methods. One bottle method...
The neutron electric dipole moment (EDM) is a sensitive probe for currently undiscovered sources of charge-parity symmetry violation. As part the TRIUMF Ultracold Advanced Neutron (TUCAN) collaboration, we are developing spin analyzers ultracold neutrons (UCNs) to be used next-generation experiment measure EDM with unprecedented precision. Spin-state analysis UCNs constitutes an essential measurement sequence. Magnetized iron films as filters crucial experimental components, whose...
The neutron electric dipole moment (EDM) is a sensitive probe for currently undiscovered sources of charge-parity symmetry violation.As part the TRIUMF Ultracold Advanced Neutron (TUCAN) collaboration, we are developing spin analyzers ultracold neutrons (UCNs) to be used next-generation experiment measure EDM with unprecedented precision.Spin-state analysis UCNs constitutes an essential measurement sequence.Magnetized iron films as filters crucial experimental components, whose performance...
The ``neutron lifetime puzzle'' arises from the discrepancy between neutron measurements obtained using beam method, which measures decay products, and bottle disappearance of neutrons. To resolve this puzzle, we conducted an experiment a pulsed cold at J-PARC. In experiment, is determined ratio counts to $^3$He(n,p)$^3$H reactions in gas detector. This belongs method but differs previous experiments that measured protons, as it instead detects electrons, enabling with distinct systematic...
Metal tubes plated with nickel-phosphorus are used in many fundamental physics experiments that use ultracold neutrons (UCN) because of their ease fabrication. These usually polished to an average roughness $25\text{--}150\phantom{\rule{0.16em}{0ex}}\mathrm{nm}$. However, there is no scattering model accurately describes UCN on such a rough guide surface mean-square greater than $5\phantom{\rule{0.16em}{0ex}}\mathrm{nm}$. We, therefore, developed for which from random waviness size larger...
Gravity is the most familiar force at our natural length scale. However, it still exotic from view point of particle physics. The first experimental study quantum effects under gravity was performed using a cold neutron beam in 1975. Following this, an investigation gravitationally bound states ultracold neutrons started 2002. This system now well understood, and one can use as tunable tool to probe gravity. In this paper, we review recent measurement position-space wave functions such...
Neutron imaging is a nondestructive inspection technique that has wide range of applications. One the important aspects neutron achieving micrometer-scale spatial resolution. The development high-resolution detector challenging task. As one potential solution to this task, we investigate whether detectors based on fine-grained nuclear emulsions are suitable for High track density necessary improve quality imaging. However, available analysis methods difficult apply under high conditions....
A possibility of new type experimental searches for physics beyond the standard model is being introduced in symmetry tests neutron-induced compound states according to successful operation intense pulsed neutron sources. The basis experiment design discussed.
The TRIUMF Ultra-Cold Advanced Neutron (TUCAN) collaboration aims at a precision neutron electric dipole moment (nEDM) measurement with an uncertainty of 10 -27 e•cm, which is orderof-magnitude better than the current nEDM upper limit and enables us to test Supersymmetry.To achieve this precision, we are developing new high-intensity ultracold (UCN) source using super-thermal UCN production in superfluid helium (He-II) spectrometer.The development status them reported article.
The Nagoya University Accelerator driven Neutron Source (NUANS) is constructed at the main campus of University. electrostatic accelerator used with maximum proton energy and intensity 2.8MeV, 15mA(42kW) respectively. Two neutron beamlines are designed NUANS. BL1 dedicated to BNCT development. BL2 for research development devices imaging. neutrons generated by using (p, n) reaction from a thin beryllium target. We compact target station measured transmission image.
(Received July 14, 2013)Ultracold neutrons (UCNs) have very low kinetic energy, therefore they can be bound by terrestrialgravity above a reflecting mirror. The wave function of the state has characteristic modu-lation. We developed novel technique magnifying UCN distribution using cylindrical rodas convex mirror to overcome current neutron detector resolution several microns. ob-served modulation is in good agreement with prediction. estimatedto 0:7 m. This first observation gravitationally...
A free neutron decays in a lifetime of about $880\,\mathrm{s}$. Although the is an important parameter modern physics, there $4.6\sigma$ ($9.5\,\mathrm{s}$) discrepancy between experimental results two typical methods: beam method and storage method. We are carrying out new to measure using pulsed at J-PARC MLF BL05 determine cause discrepancy, whether overlooked systematic uncertainties or physics. review our experiment including first physics result with acquired data during 2014 - 2016...