23 research outputs found
Search for Lorentz and CPT violation using sidereal time dependence of neutrino flavor transitions over a short baseline
A class of extensions of the Standard Model allows Lorentz and CPT violations, which can be identified
by the observation of sidereal modulations in the neutrino interaction rate. A search for such modulations
was performed using the T2K on-axis near detector. Two complementary methods were used in this study,
both of which resulted in no evidence of a signal. Limits on associated Lorentz and CPT-violating terms
from the Standard Model extension have been derived by taking into account their correlations in this
model for the first time. These results imply such symmetry violations are suppressed by a factor of more
than 10 20 at the GeV scale
Search for nucleon decay into charged antilepton plus meson in 0.316 megaton . years exposure of the Super-Kamiokande water Cherenkov detector
We have searched for proton decays into a charged antilepton (e+, ÎŒ+) plus a meson (η, Ï0, Ï) and for neutron decays into a charged antilepton (e+, ÎŒ+) plus a meson (Ïâ, Ïâ) using Super-Kamiokande I-IV data, corresponding to 0.316ââmegatonâ
years of exposure. This measurement updates the previous published result by using 2.26 times more data and improved analysis methods. No significant evidence for nucleon decay is observed and lower limits on the partial lifetime of the nucleon are obtained. The limits range from 3Ă1031 to 1Ă1034ââyears at 90% confidence level, depending on the decay mode
Search for Boosted Dark Matter Interacting with Electrons in Super-Kamiokande
A search for boosted dark matter using 161.9 kt yr of Super-Kamiokande IV data is presented. We search
for an excess of elastically scattered electrons above the atmospheric neutrino background, with a visible
energy between 100 MeV and 1 TeV, pointing back to the Galactic center or the Sun. No such excess is
observed. Limits on boosted dark matter event rates in multiple angular cones around the Galactic center
and Sun are calculated. Limits are also calculated for a baseline model of boosted dark matter produced
from cold dark matter annihilation or decay. This is the first experimental search for boosted dark matter
from the Galactic center or the Sun interacting in a terrestrial detector
Aging of Polyurethane Foam Insulation in Simulated Refrigerator PanelsâThree-Year Results with Third-Generation Blowing Agents
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Numerical analysis of heat transfer by conduction and natural convection in loose-fill fiberglass insulation--effects of convection on thermal performance
A two-dimensional code for solving equations of convective heat transfer in porous media is used to analyze heat transfer by conduction and convection in the attic insulation configuration. The particular cases treated correspond to loose-fill fiberglass insulation, which is characterized by high porosity and air permeability. The effects of natural convection on the thermal performance of the insulation are analyzed for various densities, permeabilities, and thicknesses of insulation. With convection increasing the total heat transfer through the insulation, the thermal resistance was found to decrease as the temperature difference across the insulating material increases. The predicted results for the thermal resistance are compared with data obtained in the large-scale climate simulator at the Roof Research Center using the attic test module, where the same phenomenon has already been observed. The way the wood joists within the insulation influence the start of convection is studied for differing thermophysical and dynamic properties of the insulating material. The presence of wood joists induces convection at a lower temperature difference