Shizuoka University of Welfare

www.suw.ac.jp
Yaizu, Japan

Shizuoka University of Welfare is a private university in Yaizu city, Shizuoka Prefecture, Japan, established in 2004.The university specializes in social welfare programmes, and current has five departments:Department of Psychology in Social WelfareDepartment of Medicine in Social WelfareDepartment of Health in Social WelfareDepartment of Informatics in Social WelfareDepartment of Care and Welfare Wikipedia.


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PubMed | Gifu University, Chiba University, Tsinghua University, State University of New York at Stony Brook and 24 more.
Type: Journal Article | Journal: Physical review letters | Year: 2014

We present the results of searches for nucleon decay via n[over ]0 and p[over ]+ using data from a combined 172.8ktyr exposure of Super-Kamiokande-I,-II, and-III. We set lower limits on the partial lifetime for each of these modes: n[over ]0>1.110(33) years and p[over ]+>3.910(32) years at a 90% confidence level.


PubMed | Gifu University, University of Regina, Fukuoka Institute of Technology, Tsinghua University and 27 more.
Type: Journal Article | Journal: Physical review letters | Year: 2015

Search results for nucleon decays pe^{+}X, p^{+}X, n (where X is an invisible, massless particle) as well as dinucleon decays npe^{+}, np^{+}, and np^{+} in the Super-Kamiokande experiment are presented. Using single-ring data from an exposure of 273.4ktonyr, a search for these decays yields a result consistent with no signal. Accordingly, lower limits on the partial lifetimes of _{pe^{+}X}>7.910^{32} yr, _{p^{+}X}>4.110^{32} yr, _{n}>5.510^{32} yr, _{npe^{+}}>2.610^{32}yr, _{np^{+}}>2.210^{32} yr, and _{np^{+}}>2.910^{31} yr at a 90% confidence level are obtained. Some of these searches are novel.


PubMed | Gifu University, Chiba University, University of Regina, Fukuoka Institute of Technology and 29 more.
Type: Journal Article | Journal: Physical review letters | Year: 2014

The trilepton nucleon decay modes pe+ and p+ violate |(B-L)| by two units. Using data from a 273.4 ktyr exposure of Super-Kamiokande a search for these decays yields a fit consistent with no signal. Accordingly, lower limits on the partial lifetimes of pe+>1.710(32) years and p+>2.210(32) years at a 90% confidence level are obtained. These limits can constrain Grand Unified Theories which allow for such processes.


PubMed | Gifu University, University of Regina, Fukuoka Institute of Technology, Tsinghua University and 27 more.
Type: Journal Article | Journal: Physical review letters | Year: 2015

Super-Kamiokande (SK) can search for weakly interacting massive particles (WIMPs) by detecting neutrinos produced from WIMP annihilations occurring inside the Sun. In this analysis, we include neutrino events with interaction vertices in the detector in addition to upward-going muons produced in the surrounding rock. Compared to the previous result, which used the upward-going muons only, the signal acceptances for light (few-GeV/c^{2}-200-GeV/c^{2}) WIMPs are significantly increased. We fit 3903 days of SK data to search for the contribution of neutrinos from WIMP annihilation in the Sun. We found no significant excess over expected atmospheric-neutrino background and the result is interpreted in terms of upper limits on WIMP-nucleon elastic scattering cross sections under different assumptions about the annihilation channel. We set the current best limits on the spin-dependent WIMP-proton cross section for WIMP masses below 200GeV/c^{2} (at 10GeV/c^{2}, 1.4910^{-39}cm^{2} for bb[over ] and 1.3110^{-40}cm^{2} for ^{+}^{-} annihilation channels), also ruling out some fraction of WIMP candidates with spin-independent coupling in the few-GeV/c^{2} mass range.


PubMed | Gifu University, Tsinghua University, State University of New York at Stony Brook, Tokai University and 24 more.
Type: Journal Article | Journal: Physical review letters | Year: 2014

A search for the dinucleon decay pp K+ K+ has been performed using 91.6ktonyr data from Super-Kamiokande-I. This decay provides a sensitive probe of the R-parity-violating parameter 112. A boosted decision tree analysis found no signal candidates in the data. The expected background was 0.280.19 atmospheric neutrino induced events and the estimated signal detection efficiency was 12.6%3.2%. A lower limit of 1.710(32)years has been placed on the partial lifetime of the decay O16 C14K+ K+ at 90% C.L. A corresponding upper limit of 7.810(-9) has been placed on the parameter 112.

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