A5010099610- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Muon and positron interactions and applications
- Neutrino Physics Research
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Advanced NMR Techniques and Applications
- High-Energy Particle Collisions Research
- Radiation Detection and Scintillator Technologies
- Nuclear physics research studies
- Atomic and Molecular Physics
- Rare-earth and actinide compounds
- Dark Matter and Cosmic Phenomena
- Medical Imaging Techniques and Applications
- Magnetic and transport properties of perovskites and related materials
- Nuclear Physics and Applications
- Magnetic properties of thin films
- X-ray Spectroscopy and Fluorescence Analysis
- Theoretical and Computational Physics
- Magnetic Properties of Alloys
- Fusion materials and technologies
- Graphite, nuclear technology, radiation studies
High Energy Accelerator Research Organization
2005-2023
Osaka University
2016
TRIUMF
1978-2016
Institute for Nuclear Research
2001-2016
University of British Columbia
1979-2016
Chiba University
2015-2016
Russian Academy of Sciences
2001
University of Tsukuba
2001
Institute of Particle and Nuclear Studies
2000
The University of Tokyo
1981-1994
Zero- and low-field spin-relaxation functions have been studied for the first time by using positive muons, results are compared with stochastic theory of relaxation formulated Kubo Toyabe. The dipolar broadening zero-field has in detail. In Zr${\mathrm{H}}_{2}$, function ${\ensuremath{\mu}}^{+}$ found to decay ${(5)}^{\mathrm{\textonehalf{}}}$ times faster than high-field function, which is explained terms contribution nonsecular part interaction. Advantages method over conventional...
This chapter of the report "Flavor in era LHC" Workshop discusses theoretical, phenomenological and experimental issues related to flavor phenomena charged lepton sector conserving CP-violating processes. We review current limits main theoretical models for structure fundamental particles. analyze consequences available data, setting constraints on explicit beyond standard model, presenting benchmarks discovery potential forthcoming measurements both at LHC low energy, exploring options...
The diffusion of positive muons (${\ensuremath{\mu}}^{+}$\ensuremath{\approxeq}0.11\ifmmode\times\else\texttimes\fi{}proton mass) in copper was studied experimentally by the zero-field muon-spin-relaxation method a temperature (T) range from 70 mK to 190 K, using pulsed muon beam suitable for present method. measurements were performed three samples different purities see effect impurities on nature ${\ensuremath{\mu}}^{+}$ diffusion. We find that (hopping) rate \ensuremath{\nu} ultrapure...
We find that thermal-energy muonium atoms are emitted from a clean hot tungsten foil in which positive muons stopping near the surface. The temperature dependence of thermal-muonium signal yields surprisingly low activation energy 0.66(4) eV, suggesting we observing thermionic emission solid. total yield at 2300 K is about 0.04 per stopped muon 23 MeV/c initial momentum. A number new experiments should be possible using this unique source thermal vacuum.
The spin-lattice relaxation time (${T}_{1}$) of the interstitial ${\ensuremath{\mu}}^{+}$ spin in paramagnetic phase a weak itinerant-electron helimagnet MnSi has been measured near magnetic-ordering temperature 700-Oe longitudinal magnetic field. observed dependence $\frac{1}{{T}_{1}}$ is represented very well by $\frac{T}{(T\ensuremath{-}{T}_{c})}$ which was predicted on basis self-consistent renormalization theory fluctuations ferromagnets.
The temperature dependence of the longitudinal relaxation time positive-muon spin in paramagnetic MnO has been determined by measuring ${\ensuremath{\mu}}^{+}\ensuremath{-}{e}^{+}$ forward/backward asymmetry. time, ${T}_{1}=2.00$ \ensuremath{\mu}sec at 124 K can be accounted for terms exchange-fluctuating ${\mathrm{Mn}}^{++}$ atomic dipolar fields; increase ${T}_{1}$ with shows that is further slowed fast diffusional motion ${\ensuremath{\mu}}^{+}$.
An improved search for a $T$-violating transverse muon polarization $({P}_{T})$ in ${K}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\mu}}^{+}\ensuremath{\nu}$ decay was performed using kaon decays at rest. By means of this method, ${P}_{T}$ extracted with small systematic errors, ${P}_{T}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\ensuremath{-}0.0042\ifmmode\pm\else\textpm\fi{}0.0049(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.0009(\mathrm{syst})$, and the...
Three beam lines for secondary charged particles are constructed in the hadron experimental hall of J-PARC. The K1.8 line, which incorporates two separators, delivers clean beams kaons up to 2 GeV/c. K1.8BR line is a branch K1.8, low-momentum 1.2 K1.1BR shorter designed kaons. Details these designs, as well commissioning results, described.
The static and the dynamic character of hyperfine field in weak itinerant helimagnet MnSi has been probed by using positive muon spins. Knight shift measured transverse-field spin rotation method, which revealed a large negative at interstitial sites, even larger compared with other ferromagnetic metals. coupling constant A hf determined to be -4.8 kOe/µ B . divergence spin-lattice relaxation rate near magnetic ordering observed for first time longitudinal-field method. temperature...
The energy spectra of photons following negative muon absorption in $^{12}\mathrm{C}$, $^{16}\mathrm{O}$, $^{27}\mathrm{Al}$, $^{40}\mathrm{Ca}$, $^{\mathrm{nat}}\mathrm{Fe}$, $^{165}\mathrm{Ho}$, and $^{209}\mathrm{Bi}$ have been measured with two NaI spectrometers. branching ratios for the emission high give information on induced pseudoscalar coupling constant ${g}_{P}$ nuclear matter. data light nuclei are agreement theoretical calculations using nucleonic value...
At the 12-GeV proton synchrotron of KEK, an experiment (KEK-PS-E246) was performed to measure transverse muon polarization (${P}_{T}$) in ${K}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\mu}}^{+}\ensuremath{\nu}$ decays as a direct search violation time reversal invariance ($T$-violation). ${P}_{T}$ is very sensitive probe $CP$ beyond standard model. A stopped positive kaon beam used. An elaborate high-acceptance detector, conjunction with 12-sector superconducting...
A search for T-violating transverse muon polarization (P(T)) in the K+-->pi(0)mu(+)nu decay was performed using kaon decays at rest. new improved value P(T)=-0.0017+/-0.0023(stat)+/-0.0011(syst) obtained giving an upper limit |P(T)|<0.0050. The T-violation parameter determined to be Imxi=-0.0053+/-0.0071(stat)+/-0.0036(syst) |Imxi|<0.016.
The Knight shift of negative muon (${\ensuremath{\mu}}^{\ensuremath{-}}\mathrm{Pd}$) in Pd metal has been determined to be - (9.0 \ifmmode\pm\else\textpm\fi{} 0.7)% at $T=11$ K, revealing an unusually large hyperfine anomaly between ${\ensuremath{\mu}}^{\ensuremath{-}}\mathrm{Pd}$ and its equivalent isotope $\mathrm{Rh}\mathrm{Pd}$; $\frac{{H}_{\mathrm{hf}}({\ensuremath{\mu}}^{\ensuremath{-}}\mathrm{Pd})}{{H}_{\mathrm{hf}}(\mathrm{Rh}Pd)}=0.64\ifmmode\pm\else\textpm\fi{}0.05$, or...