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View article: European Strategy for Particle Physics Update -- PIONEER: a next generation rare pion decay experiment
European Strategy for Particle Physics Update -- PIONEER: a next generation rare pion decay experiment Open
PIONEER is a rapidly developing effort aimed to perform a pristine test of lepton flavour universality (LFU) and of the unitarity of the first row of the CKM matrix by significantly improving the measurements of rare decays of the charged …
View article: OPTICAL SPECTROSCOPIC MONITORING OF THE BE/WHITE DWARF BINARY CANDIDATES: γ CASSIOPEIA AND π AQUARII
OPTICAL SPECTROSCOPIC MONITORING OF THE BE/WHITE DWARF BINARY CANDIDATES: γ CASSIOPEIA AND π AQUARII Open
γ Cas and π Aqr are classical Be stars and Be/white dwarf binary candidates. We conducted low-dispersion spectroscopic monitoring observations of these two objects. As a result, we detected signs of long-period variations in the Balmer dec…
View article: REPORT ON WELDING PROPERTIES OF DIAGONAL THICK SECTION IN TRUSS FRAME USING TMCP440
REPORT ON WELDING PROPERTIES OF DIAGONAL THICK SECTION IN TRUSS FRAME USING TMCP440 Open
In recent years, with the development of high-strength steel materials and improvements in welding technology, high-strength steel has been widely used in steel structure. In the Nagoya Zokei University of Art & Design project, 40m trusses…
View article: Standardized models for cracking due to restraint of imposed strains—The state of the art
Standardized models for cracking due to restraint of imposed strains—The state of the art Open
Crack control throughout the service life of a structure has always been a challenging task for engineers and asset owners, particularly those who are involved with the design and construction of structures with increased durability requir…
View article: Development of ultra-pure gadolinium sulfate for the Super-Kamiokande gadolinium project
Development of ultra-pure gadolinium sulfate for the Super-Kamiokande gadolinium project Open
This paper reports the development and detailed properties of about 13 metric tons of gadolinium sulfate octahydrate, $\rm Gd_2(\rm SO_4)_3\cdot \rm 8H_2O$, which has been dissolved into Super-Kamiokande (SK) in the summer of 2020. We eval…
View article: Upper limits on branching ratios of the lepton-flavor-violating decays $\tau \to \ell \gamma\gamma$ and $\tau \to \ell X$.
Upper limits on branching ratios of the lepton-flavor-violating decays $\tau \to \ell \gamma\gamma$ and $\tau \to \ell X$. Open
From analysis of data produced by the BABAR experiment, the first upper bounds (90% C.L.) were obtained on the branching ratios $Br(\tau \to e \gamma\gamma)<2.5 \times 10^{-4}$ and $Br(\tau \to \mu \gamma\gamma)<5.8 \times 10^{-4}$. In add…
View article: Search for neutrinos associated with solar flare
Search for neutrinos associated with solar flare Open
Importance of search for neutrinos generated during solar flares has been discussed for last 60~years, however, neutrinos associated with solar flares~(solar flare neutrinos) have not been obserbed yet. Since neutrinos are not affected by …
View article: Upper Limits on Branching Ratios of Decays $\tau \to \ell \gamma\gamma$ and $\tau \to \ell X$
Upper Limits on Branching Ratios of Decays $\tau \to \ell \gamma\gamma$ and $\tau \to \ell X$ Open
From analysis of data produced by the BABAR experiment, the first upper bounds (90% C.L.) were obtained on the branching ratios $Br(\tau \to e \gamma\gamma)<2.5 \times 10^{-4}$ and $Br(\tau \to \mu \gamma\gamma)<5.8 \times 10^{-4}$. In add…
View article: Search for Heavy Neutrinos in \(\pi ^{ + } \to \mu ^{ + }\nu \) Decay and Status of Lepton Universality Test in the PIENU Experiment
Search for Heavy Neutrinos in \(\pi ^{ + } \to \mu ^{ + }\nu \) Decay and Status of Lepton Universality Test in the PIENU Experiment Open
In the present work of the PIENU experiment, heavy neutrinos were sought in pion decays \\(\\pi ^{ + } \\to \\mu ^{ + }\\nu \\). No evidence for extra peak was found in the muon kinetic energy spectrum and 90% confidence level upper limits…
View article: Improved method for measuring low-concentration radium and its application to the Super-Kamiokande Gadolinium project
Improved method for measuring low-concentration radium and its application to the Super-Kamiokande Gadolinium project Open
Chemical extraction using a molecular recognition resin named “Empore Radium Rad Disk” was developed to improve sensitivity for the low concentration of radium (Ra). Compared with the previous method, the extraction process speed was impro…
View article: Improved method for measuring low concentration radium and its\n application to the Super-Kamiokande Gadolinium project
Improved method for measuring low concentration radium and its\n application to the Super-Kamiokande Gadolinium project Open
Chemical extraction using a molecular recognition resin named "Empore Radium\nRad Disk" was developed to improve sensitivity for the low concentration of\nradium (Ra). Compared with the previous method, the extraction process speed\nwas im…
View article: Search for the rare decays $\\pi^+ \\to \\mu^+\\nu_\\mu\\nu\\bar\\nu$ and $\\pi^+ \\to e^+\\nu_e\\nu\\bar\\nu$
Search for the rare decays $\\pi^+ \\to \\mu^+\\nu_\\mu\\nu\\bar\\nu$ and $\\pi^+ \\to e^+\\nu_e\\nu\\bar\\nu$ Open
The rare pion decays ${\\pi}^+{\\rightarrow}{\\mu}^+{\\nu}_{\\mu}{\\nu}\\bar{\\nu}$ and ${\\pi}^+{\\rightarrow}e^+{\\nu}_{e}{\\nu}\\bar{\\nu}$ are allowed in the Standard Model but highly suppressed. These decays were searched for using da…
View article: Evaluation of gadolinium’s action on water Cherenkov detector systems with EGADS
Evaluation of gadolinium’s action on water Cherenkov detector systems with EGADS Open
Artículo escrito por un elevado número de autores, sólo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiera, y los autores pertenecientes a la UAM
View article: Evaluation of Gadolinium's Action on Water Cherenkov Detector Systems with EGADS
Evaluation of Gadolinium's Action on Water Cherenkov Detector Systems with EGADS Open
Used for both proton decay searches and neutrino physics, large water Cherenkov (WC) detectors have been very successful tools in particle physics. They are notable for their large masses and charged particle detection capabilities. While …
View article: Thermal surface neutralization of Fr ions with metal foils for magneto-optical trapping of radioisotopes
Thermal surface neutralization of Fr ions with metal foils for magneto-optical trapping of radioisotopes Open
We investigate neutralization processes (especially thermal surface neutralization), which are required for the magneto-optical trapping of radioactive atoms. A variety of neutralization methods are first summarized: neutral beam injection…
View article: Development of a method for measuring rare earth elements in the environment for future experiments with gadolinium-loaded detectors
Development of a method for measuring rare earth elements in the environment for future experiments with gadolinium-loaded detectors Open
Demand to use gadolinium (Gd) in detectors is increasing in the field of elementary particle physics, especially in neutrino measurements and dark matter searches. Large amounts of Gd are used in these experiments. To assess the impact of …
View article: Emission characteristics of a lean-premixed ammonia/natural-gas gas-turbine combustor and effect of secondary ammonia injection
Emission characteristics of a lean-premixed ammonia/natural-gas gas-turbine combustor and effect of secondary ammonia injection Open
To develop an NH3/natural gas-fired gas-turbine combustor with minimal modifications to a natural gas-fired combustor, the effect of co-firing NH3 with natural gas on emission characteristics and combustion efficiency is investigated exper…
View article: Current status and future prospect of Super-Kamiokande
Current status and future prospect of Super-Kamiokande Open
Super-Kamiokande (SK) is water Cherenkov detector with a mass of 50 kton to search for proton decays and measure neutrinos from various sources. The SK experiment has been started since 1996, and accumulated data over twenty years. Now we …
View article: Improved Search for Heavy Neutrinos and a Test of Lepton Universality in the Decay $π^+ \rightarrow \mbox{e}^+ ν$
Improved Search for Heavy Neutrinos and a Test of Lepton Universality in the Decay $π^+ \rightarrow \mbox{e}^+ ν$ Open
Two results from the PIENU Experiment are presented reporting a test of lepton universality in pion decay and improved limits on heavy neutrinos coupling to positrons. The status of the full analysis for the $π^+ \rightarrow \mbox{e}^+ ν$ …
View article: Development of the measurement of radium using a germanium detector with molecular recognition resin
Development of the measurement of radium using a germanium detector with molecular recognition resin Open
High-purity germanium (HPGe) detectors are widely used for the measurement of the low concentrated radioactivities. For the Super-Kamiokande-Gadolinium project, the concentration of radium in Gd$_2$(SO$_4$)$_3{\cdot}$8H$_2$O is determined …
View article: Determination of trace level thorium and uranium in high purity gadolinium sulfate using ICP-MS with solid-phase chromatographic extraction resins
Determination of trace level thorium and uranium in high purity gadolinium sulfate using ICP-MS with solid-phase chromatographic extraction resins Open
The Super Kamiokand-Gadolinium (SK-Gd) project is the upgrade of the Super-Kamiokande (SK) detector in order to discover Supernova Relic Neutrinos (SRNs) by loading 0.2% of Gd2(SO4)3 into a 50 kton of the SK water tank. In order to continu…
View article: Precision Measurement of the $\pi$$^+$$\rightarrow$$e^+$$\nu$$_e$ Branching Ratio in the PIENU Experiment
Precision Measurement of the $\pi$$^+$$\rightarrow$$e^+$$\nu$$_e$ Branching Ratio in the PIENU Experiment Open
The PIENU experiment at TRIUMF aims to measure the branching ratio of the pion decay modes Rπ=[π+→e+νe(γ)]/[π+→μ+νμ(γ)] with precision of <0.1%. Precise measurement of Rπ provides a stringent test of electron-muon universality in weak inte…
View article: Status of RI background reduction for SK-Gd
Status of RI background reduction for SK-Gd Open
The Super Kamiokande-Gadolinium (SK-Gd) project is the upgrade of the Super-Kamiokande (SK) detector in order to discover Supernova Relic Neutrinos (SRNs) by loading 0.2% of Gd$_2$(SO$_4$)$_3$ into a 50 kton of the SK water tank. In order …
View article: Initial results from the PIENU experiment
Initial results from the PIENU experiment Open
The pion branching ratio, $R_{\\pi} = \\frac{\\Gamma ( \\pi^+ \\to e^+ \\nu_e + \\pi^+ \\to e^+ \\nu_e \\gamma)}{\\Gamma (\\pi^+ \\to \\mu^+ \\nu_{\\mu} + \\pi^+ \\to \\mu^+ \\nu_{\\mu} \\gamma)}$ , provides a sensitive test of lepton univ…
View article: Status of the PIENU experiment at TRIUMF
Status of the PIENU experiment at TRIUMF Open
The PIENU experiment at TRIUMF aims to measure the branching ratio of pion decays R = Γ(π(+) → e(+)ν(e) + π(+) → e(+) ν(e)γ)/Γ(π(+)→μ(+)ν(μ) + π(+) → μ(+)ν(μ)γ) with precision <0.1%, providing a stringent test of the Standard Model hypothe…