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1. Search for Dinucleon Decay into Kaons in Super-Kamiokande

Author

T. Tsukamoto, A. T. Suzuki, T. Nakadaira, Makoto Sakuda, Masato Shiozawa, Y. Choi, Minoru Yoshida, B. S. Yang, T. Ishida, M. Ikeda, Haoxiong Zhang, S. Hazama, R. Terri, T. Hasegawa, T. Ishizuka, K. Sakashita, Y. Takenaga, C. McGrew, Yoshihiro Suzuki, M. Miura, N. Tamura, Takaaki Mori, Y. Totsuka, T. Wongjirad, J. L. Stone, Ken-ichiro Kobayashi, Koji Nakamura, Henry W. Sobel, K. Iyogi, Y. Takeuchi, B. Henning, M. Goldhaber, J. P. Cravens, Shigeki Tasaka, E. Thrane, N. Tanimoto, K. Ueshima, T. Kajita, A. Kibayashi, Shigetaka Moriyama, Yoshitaka Itow, T. Ishii, H. Kaji, J. S. Jang, Tsutomu Yokozawa, T. McLachlan, Hiroshi Watanabe, M. B. Smy, K. Connolly, Zishuo Yang, Kate Scholberg, Michael Litos, Atsushi Takeda, C. W. Walter, John Hill, Justin Albert, H. Okazawa, Y. Kuno, T. Kobayashi, G. Mitsuka, S. B. Kim, J. Y. Kim, R. J. Wilkes, S. Mino, Hirokazu Ishino, I. T. Lim, W. E. Keig, Masashi Yokoyama, David William Casper, M. Vagins, K. Kaneyuki, H. Nishino, H. Ogawa, Y. Shimizu, J. G. Learned, Yuichi Oyama, M. Dziomba, K. Nishijima, K. Nishikawa, Y. Kozuma, K. Abe, C. Ishihara, Masayuki Nakahata, S. Mine, Tsuyoshi Nakaya, M. Koshiba, S. Matsuno, Tetsuya S. Tanaka, Ko Okumura, Y. Hayato, L. R. Sulak, K. S. Ganezer, G. Lopez, Yusuke Koshio, Koh Ueno, A. Minamino, C. Yanagisawa, S. Nakayama, R. A. Wendell, J. Kameda, P. Mijakowski, E. Kearns, T. Sekiguchi, K. Bays, Hiroyuki Sekiya, Y. Fukuda, Y. Heng, Frédéric Dufour, Song Chen, T. Iida, H. Toyota, C. Regis, C. K. Jung, J. L. Raaf, D. Kielczewska, Y. Watanabe, Y. Yokosawa, Y. Obayashi, W. R. Kropp, and S. Yamada

Subjects
Physics, Particle physics, Bound state, General Physics and Astronomy, Atmospheric neutrino, Super-Kamiokande, Lower limit
Abstract

A search for the dinucleon decay $pp\ensuremath{\rightarrow}{K}^{+}{K}^{+}$ has been performed using $91.6\text{ }\text{ }\mathrm{kton}\ifmmode\cdot\else\textperiodcentered\fi{}\text{yr}$ data from Super-Kamiokande-I. This decay provides a sensitive probe of the $R$-parity-violating parameter ${{\ensuremath{\lambda}}_{112}}^{\ensuremath{'}\ensuremath{'}}$. A boosted decision tree analysis found no signal candidates in the data. The expected background was $0.28\ifmmode\pm\else\textpm\fi{}0.19$ atmospheric neutrino induced events and the estimated signal detection efficiency was $12.6%\ifmmode\pm\else\textpm\fi{}3.2%$. A lower limit of $1.7\ifmmode\times\else\texttimes\fi{}{10}^{32}\text{ }\text{ }\text{years}$ has been placed on the partial lifetime of the decay $^{16}\mathrm{O}\ensuremath{\rightarrow}^{14}\mathrm{C}{K}^{+}{K}^{+}$ at 90% C.L. A corresponding upper limit of $7.8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}9}$ has been placed on the parameter ${{\ensuremath{\lambda}}_{112}}^{\ensuremath{'}\ensuremath{'}}$.

Published
2014

2. Development of low cost production technologies for polycrystalline silicon solar cells

Author

T. Tomita, T. Machida, Y. Yokosawa, M. Murakami, H. Kumada, H. Nakaya, T. Nunoi, A. Miyazawa, and S. Tanaka

Subjects
Materials science, Renewable Energy, Sustainability and the Environment, business.industry, Substrate (electronics), engineering.material, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Grinding, Monocrystalline silicon, Atmospheric pressure chemical vapor deposition, Polycrystalline silicon, Coating, Electrode, engineering, Optoelectronics, business, Groove (music)
Abstract

To develop a technology of forming grooves for low cost cell production, a multi-blade wheel grinding method was investigated. The process time of groove formation on the surface of 10 × 10 cm 2 polycrystalline silicon substrate was reduced to 30 s by a newly developed high-speed groove formation machine. Simultaneous formation of junction and anti-reflection coating by atmospheric pressure chemical vapor deposition (APCVD) technique was also investigated. For electrodes formation process, single firing method for both side electrodes made possible to simplify the firing process and to speed up from a conventional speed of 400 mm/min to 5000 mm/min.

Published
1997

3. Search for nucleon decay into charged antilepton plus meson in Super-Kamiokande I and II

Author

Atsushi Takeda, A. T. Suzuki, Y. Totsuka, T. Nakadaira, T. Tsukamoto, H. W. Sobel, Makoto Sakuda, C. W. Walter, Takaaki Kajita, G. D. Lopez, C. Yanagisawa, J. Liu, Yoshitaka Itow, B. S. Yang, Y. Idehara, J. G. Learned, T. Ishida, G. Mitsuka, Y. Furuse, N. Tanimoto, Shigeki Tasaka, Frédéric Dufour, K. Nishikawa, K. Nishijima, C. McGrew, N. Tamura, K. Ueshima, K. Sakashita, Hiroyuki Sekiya, Y. Hayato, John Hill, J. P. Cravens, Y. Fukuda, J. L. Stone, W. E. Keig, K. Kaneyuki, Shaomin Chen, Minoru Yoshida, S. Moriyama, R. J. Wilkes, M. Koshiba, T. Sekiguchi, Yuichi Oyama, M. Goldhaber, L. R. Sulak, Tetsuya S. Tanaka, Ko Okumura, Y. Takeuchi, K. Bays, Masayuki Nakahata, H. Nishino, E. Kearns, Y. Takenaga, M. Miura, Masashi Yokoyama, M. B. Smy, Yasunari Suzuki, K. Abe, H. Kaji, M. R. Vagins, J. S. Jang, Koh Ueno, Hiroshi Watanabe, Michael Litos, H. Okazawa, S. Mine, K. Connolly, T. Ishizuka, M. Ikeda, Yusuke Koshio, T. Ishii, T. Kobayashi, Tsuyoshi Nakaya, I. T. Lim, A. Minamino, C. K. Jung, Masato Shiozawa, Y. Choi, Takehisa Hasegawa, C. Ishihara, Haoxiong Zhang, S. Hazama, S. B. Kim, S. Matsuno, E. Thrane, J. Y. Kim, Justin Albert, Y. Kuno, Zishuo Yang, Kate Scholberg, C. Regis, J. L. Raaf, D. Kielczewska, Y. Watanabe, Y. Yokosawa, Y. Obayashi, W. R. Kropp, K. Nakamura, S. Yamada, I. Higuchi, Y. Heng, H. Seo, T. Iida, J. Kameda, S. Nakayama, R. A. Wendell, and K. S. Ganezer

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, FOS: Physical sciences, 01 natural sciences, 7. Clean energy, Omega, High Energy Physics - Experiment, 3. Good health, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, High Energy Physics::Experiment, Atmospheric neutrino, 010306 general physics, Nucleon, Super-Kamiokande
Abstract

Searches for a nucleon decay into a charged anti-lepton (e^+ or {\mu}^+) plus a light meson ({\pi}^0, {\pi}^-, {\eta}, {\rho}^0, {\rho}^-, {\omega}) were performed using the Super-Kamiokande I and II data. Twelve nucleon decay modes were searched for. The total exposure is 140.9 kiloton \cdot years, which includes a 91.7 kiloton \cdot year exposure (1489.2 live days) of Super-Kamiokande-I and a 49.2 kiloton \cdot year exposure (798.6 live days) of Super-Kamiokande-II. The number of candidate events in the data was consistent with the atmospheric neutrino background expectation. No significant evidence for a nucleon decay was observed in the data. Thus, lower limits on the nucleon partial lifetime at 90% confidence level were obtained. The limits range from 3.6 \times 10^31 to 8.2 \times 10^33 years, depending on the decay modes., Comment: 25 pages, 18 figures

Published
2012

4. Study of Non-Standard Neutrino Interactions with Atmospheric Neutrino Data in Super-Kamiokande I and II

Author

Y. Takeuchi, T. Ishii, H. W. Sobel, H. Okazawa, M. Koshiba, E. Kearns, S. Matsuno, Hiroshi Watanabe, Tetsuya S. Tanaka, Ko Okumura, Y. Idehara, Shigeki Tasaka, Atsushi Takeda, Masashi Yokoyama, C. Yanagisawa, N. Tamura, Y. Totsuka, A. T. Suzuki, W. R. Kropp, E. Thrane, C. W. Walter, J. L. Stone, T. Nakadaira, K. Nakamura, H. Seo, Makoto Sakuda, T. Ishizuka, S. Yamada, K. Nishijima, I. Higuchi, K. S. Ganezer, Michael Litos, Tsuyoshi Nakaya, Hiroyuki Sekiya, A. Minamino, Y. Fukuda, Zishuo Yang, C. Regis, J. Liu, Kate Scholberg, Yoshitaka Itow, C. K. Jung, J. L. Raaf, K. Sakashita, Masato Shiozawa, Y. Choi, R. J. Wilkes, D. Kielczewska, Y. Heng, Y. Watanabe, Haoxiong Zhang, S. Hazama, M. Goldhaber, K. Nishikawa, John Hill, Y. Yokosawa, Y. Obayashi, S. B. Kim, G. Mitsuka, J. Y. Kim, T. Tsukamoto, Yuichi Oyama, W. E. Keig, Takaaki Kajita, G. D. Lopez, Frédéric Dufour, K. Abe, B. S. Yang, S. Mine, Takehisa Hasegawa, J. Kameda, Yusuke Koshio, T. Ishida, Y. Furuse, S. Nakayama, R. A. Wendell, Justin Albert, Y. Kuno, J. P. Cravens, N. Tanimoto, Minoru Yoshida, H. Nishino, K. Ueshima, M. R. Vagins, Y. Takenaga, I. T. Lim, M. Miura, J. G. Learned, J. S. Jang, C. McGrew, Y. Hayato, K. Connolly, S. Moriyama, M. Ikeda, Masayuki Nakahata, K. Kaneyuki, T. Sekiguchi, H. Kaji, K. Bays, Song Chen, Yasunari Suzuki, T. Iida, T. Kobayashi, L. R. Sulak, M. B. Smy, Koh Ueno, and C. Ishihara

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Neutral current, Physics beyond the Standard Model, High Energy Physics::Phenomenology, FOS: Physical sciences, Coupling (probability), High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Coupling parameter, High Energy Physics::Experiment, Neutrino, Super-Kamiokande, Neutrino oscillation, Lepton
Abstract

In this paper we study non-standard neutrino interactions as an example of physics beyond the standard model using atmospheric neutrino data collected during the Super-Kamiokande I(1996-2001) and II(2003-2005) periods. We focus on flavor-changing-neutral-currents (FCNC), which allow neutrino flavor transitions via neutral current interactions, and effects which violate lepton non-universality (NU) and give rise to different neutral-current interaction-amplitudes for different neutrino flavors. We obtain a limit on the FCNC coupling parameter, varepsilon_{mu tau}, |varepsilon_{mu tau}, 12 Pages, 14 figures. To be submitted to Phys. Rev. D

Published
2011

5. Solar neutrino results in Super-Kamiokande-III

Author

C. K. Jung, J. L. Raaf, Y. Takeuchi, D. Kielczewska, Y. Watanabe, G. Mitsuka, J. S. Jang, Y. Yokosawa, N. Tanimoto, Y. Obayashi, K. S. Ganezer, Song Chen, Hiroshi Watanabe, John G. Learned, K. Connolly, W. R. Kropp, H. Nishino, S. Yamada, M. Dziomba, Minoru Yoshida, C. W. Walter, C. McGrew, Masato Shiozawa, Y. Choi, T. Iida, T. Tsukamoto, J. Kameda, H. Toyota, Y. Hayato, B. S. Yang, Ken-ichiro Kobayashi, P. Mijakowski, M. Koshiba, T. Ishida, Y. Takenaga, M. Goldhaber, Yuichi Oyama, K. Ueshima, R. J. Wilkes, John Hill, T. Tanaka, S. Moriyama, Haoxiong Zhang, S. Hazama, M. Miura, R. Terri, Masayuki Nakahata, Ko Okumura, A. Kibayashi, Michael Litos, W. Wang, A. T. Suzuki, Hiroyuki Sekiya, Y. Fukuda, S. B. Kim, H. W. Sobel, J. Y. Kim, N. Tamura, S. Nakayama, Y. Heng, Takaaki Mori, Frédéric Dufour, Atsushi Takeda, L. M. Magro, K. Abe, S. Tasaka, J. L. Stone, R. A. Wendell, M. Ikeda, M. R. Vagins, T. Nakadaira, W. E. Keig, K. Nishikawa, H. Kaji, K. Kaneyuki, Koji Nakamura, Ken Sakashita, L. Labarga, T. Sekiguchi, K. Bays, T. Ishii, T. Kobayashi, Makoto Sakuda, C. Yanagisawa, Yasunari Suzuki, Justin Albert, A. Minamino, I. T. Lim, Y. Shimizu, Y. Kuno, Yoshitaka Itow, K. Nishijima, Takaaki Kajita, G. D. Lopez, S. Mino, A. L. Renshaw, E. Kearns, Masashi Yokoyama, Yusuke Koshio, T. Ishizuka, T. McLachlan, Tsuyoshi Nakaya, H. Okazawa, S. Matsuno, K. Iyogi, J. P. Cravens, T. Yokozawa, David William Casper, H. Ogawa, C. Ishihara, L. R. Sulak, M. B. Smy, Koh Ueno, Hirokazu Ishino, Y. Totsuka, T. Wongjirad, Y. Kozuma, E. Thrane, Zishuo Yang, Kate Scholberg, S. Mine, Takehisa Hasegawa, C. Regis, and UAM. Departamento de Física Teórica

Subjects
Physics, Systematic error, Nuclear and High Energy Physics, Particle physics, Solar neutrino, Física, FOS: Physical sciences, Elementary particle, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Content (measure theory), Neutrino, Super-Kamiokande, Analysis method, Lepton
Abstract

Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAM, The results of the third phase of the Super-Kamiokande solar neutrino measurement are presented and compared to the first and second phase results. With improved detector calibrations, a full detector simulation, and improved analysis methods, the systematic uncertainty on the total neutrino flux is estimated to be ± 2.1%, which is about two thirds of the systematic uncertainty for the first phase of Super-Kamiokande. The observed 8B solar flux in the 5.0 to 20 MeV total electron energy region is 2.32 ± 0.04 (stat.) ± 0.05 (sys.) x 10^6 cm^-2sec^-1, under the assumption of pure electron-flavor content, in agreement with previous measurements. A combined oscillation analysis is carried out using SK-I, II, and III data, and the results are also combined with the results of other solar neutrino experiments. The best-fit oscillation parameters are obtained to be sin^2 {\theta}12 = 0.30+0.02-0.01(tan^2 {\theta}12 = 0.42+0.04 -0.02) and {\Delta}m2_21 = 6.2+1.1-1.9 *10^-5eV^2. Combined with KamLAND results, the best-fit oscillation parameters are found to be sin^2 {\theta}12 = 0.31±0.01 (tan^2 {\theta}12 = 0.44±0.03) and {\Delta}m2_21 = 7.6 ± 0.2 x 10^-5 eV^2. The 8B neutrino flux obtained from global solar neutrino experiments is 5.3 ± 0.2 (stat + sys) x 10^6cm^-2s^-1, while the 8B flux becomes 5.1 ± 0.1 (stat +sys ) x 10^6cm^-2s^-1 by adding KamLAND result. In a three-flavor analysis combining all solar neutrino experiments, the upper limit of sin^2 {\theta}13 is 0.060 at 95% C.L.. After combination with KamLAND results, the upper limit of sin^2 {\theta}13 is found to be 0.059 at 95% C.L., The authors gratefully acknowledge the cooperation of the Kamioka Mining and Smelting Company. Super-K has been built and operated from funds provided by the Japanese Ministry of Education, Culture, Sports, Science and Technology, the U.S. Department of Energy, and the U.S. National Science Foundation. This work was partially supported by the Research Foundation of Korea (BK21 and KNRC), the Korean Ministry of Science and Technology, the National Science Foundation of China, and the Spanish Ministry of Science and Innovation (Grants No. FPA2009- 13697-C04-02 and No. Consolider-Ingenio-2010/CPAN)

Published
2011

6. Atmospheric neutrino oscillation analysis with sub-leading effects in Super-Kamiokande I, II, and III

Author

Masato Shiozawa, Y. Choi, S. Hazama, Masashi Yokoyama, Tsuyoshi Nakaya, C. Regis, K. Nishikawa, C. K. Jung, Hirokazu Ishino, N. Tanimoto, Shoei Nakayama, Atsumu Suzuki, N. Tamura, D. Kielczewska, Y. Takeuchi, David William Casper, Y. Watanabe, J. S. Jang, K. Sakashita, R. J. Wilkes, E. Kearns, I. T. Lim, Yuichi Oyama, Takaaki Kajita, G. D. Lopez, H. Nishino, Y. Yokosawa, Yasuhiro Shimizu, Masatoshi Koshiba, J. L. Stone, Y. Totsuka, T. Nakadaira, Y. Obayashi, H. Ogawa, C. Yanagisawa, Hiroshi Watanabe, Song Chen, Makoto Sakuda, M. Goldhaber, K. Abe, W. R. Kropp, K. S. Ganezer, C. W. Walter, K. Nakamura, Yoshitaka Itow, S. Yamada, S. B. Kim, Y. Kozuma, T. Iida, J. Y. Kim, Kyoshi Nishijima, Michael Litos, Huaqiao Zhang, E. Thrane, Ko Okumura, H. Toyota, K. Connolly, A. Kibayashi, Hiroyuki Sekiya, Mark R. Vagins, Y. Fukuda, Atsushi Takeda, H. Okazawa, Masayuki Nakahata, T. McLachlan, C. Ishihara, K. Ueshima, G. Mitsuka, Shigetaka Moriyama, S. Mine, Zishuo Yang, Kate Scholberg, W. Wang, John Hill, H. Kaji, A. Minamino, T. Tsukamoto, M. Fechner, H. W. Sobel, K. Kaneyuki, T. Sekiguchi, M. Ikeda, J. G. Learned, S. Tasaka, B. S. Yang, K. Bays, W. E. Keig, M. Dziomba, Toshiyuki Tanaka, Y. Heng, T. Ishida, Tsutomu Yokozawa, Yasunari Suzuki, Takehisa Hasegawa, Minoru Yoshida, Ken-ichiro Kobayashi, Frédéric Dufour, T. Kobayashi, J. Kameda, L. R. Sulak, T. Ishizuka, Y. Takenaga, M. Miura, J. L. Raaf, Koh Ueno, Yusuke Koshio, Michael B. Smy, C. McGrew, Y. Hayato, P. Mijakowski, S. Matsuno, T. Ishii, Justin Albert, Y. Kuno, S. Mino, R. A. Wendell, K. Iyogi, J. P. Cravens, and T. Mori

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Oscillation, FOS: Physical sciences, Fermion, High Energy Physics - Experiment, Massless particle, High Energy Physics - Experiment (hep-ex), Neutrino, Atmospheric neutrino, Neutrino oscillation, Super-Kamiokande, Lepton
Abstract

We present a search for non-zero theta_{13} and deviations of sin^2 theta_{23} from 0.5 in the oscillations of atmospheric neutrino data from Super-Kamiokande -I, -II, and -III. No distortions of the neutrino flux consistent with non-zero theta_{13} are found and both neutrino mass hierarchy hypotheses are in agreement with the data. The data are best fit at Delta m^2 = 2.1 x 10^-3 eV^2, sin^2 theta_{13} = 0.0, and sin^2 theta_{23} =0.5. In the normal (inverted) hierarchy theta_{13} and Delta m^2 are constrained at the one-dimensional 90% C.L. to sin^2 theta_{13} < 0.04 (0.09) and 1.9 (1.7) x 10^-3 < Delta m^2 < 2.6 (2.7) x 10^-3 eV^2. The atmospheric mixing angle is within 0.407, 17 Pages, 14 figures. To be submitted to Phys. Rev. D Minor update to text after referee comments. Figures modified for better grayscale printing.

Published
2010

7. Kinematic reconstruction of atmospheric neutrino events in a large water Cherenkov detector with proton identification

Author

K. Kaneyuki, K. Ueshima, T. Nakadaira, T. Sekiguchi, Takaaki Tanaka, W. Wang, Lawrence Sulak, Robert Svoboda, J. S. Jang, K. Abe, C. McGrew, Y. Takeuchi, H. Nishino, R. J. Wilkes, A. Minamino, T. Tsukamoto, R. A. Wendell, Ken-ichiro Kobayashi, G. Mitsuka, Kimihiro Okumura, David William Casper, Masatoshi Koshiba, Y. Obayashi, Yusuke Koshio, S. Matsuno, T. Ishii, E. Thrane, Michael Litos, H. Ogawa, Frédéric Dufour, I. T. Lim, Y. Fukuda, K. Sakashita, Huaqiao Zhang, N. Tanimoto, J. Kameda, B. S. Yang, I. Higuchi, Masayuki Nakahata, Y. Idehara, Takashi Kobayashi, Song Chen, K. Bayes, Shigeki Tasaka, S. Moriyama, T. Iida, T. Hasegawa, S. Mine, C. Ishihara, E. Kearns, Yuichi Oyama, Makoto Sakuda, A. Suzuki, Masashi Yokoyama, T. Ishida, M. B. Smy, Yoshihiro Suzuki, Hiroshi Watanabe, M. Goldhaber, Y. Furuse, M. Vagins, J. L. Stone, C. Regis, K. S. Ganezer, C. K. Jung, M. Fechner, Yoshinari Hayato, H. Okazawa, Y. Totsuka, D. Kielczewska, C. W. Walter, J. G. Learned, Y. Kuno, N. Tamura, Y. Watanabe, Zishuo Yang, C. Yanagisawa, Kate Scholberg, S. Nakayama, J. Y. Kim, Tsuyoshi Nakaya, Takaaki Kajita, S. Dazeley, Koji Nakamura, G. D. Lopez, Y. Yokosawa, J. P. Cravens, K. Ueno, Atsushi Takeda, T. Ishizuka, Hiroyuki Sekiya, Soo-Bong Kim, M. Miura, J. L. Raaf, R. Terri, Minoru Yoshida, M. Ikeda, Masato Shiozawa, Y. Choi, H. Seo, S. Hazama, Y. Takenaga, W. R. Kropp, Y. Heng, K. Nishikawa, Henry W. Sobel, Kyoshi Nishijima, Yoshitaka Itow, S. Yamada, John Hill, and W. E. Keig

Subjects
Physics, Nuclear and High Energy Physics, Sterile neutrino, Particle physics, Neutral current, Proton, Physics::Instrumentation and Detectors, Cherenkov detector, High Energy Physics::Phenomenology, High Energy Physics - Experiment, law.invention, Nuclear physics, law, High Energy Physics::Experiment, Neutrino, Neutrino oscillation, Cherenkov radiation, Lepton
Abstract

We report the development of a proton identification method for the Super-Kamiokande detector. This new tool is applied to the search for events with a single proton track, a high purity neutral current sample of interest for sterile neutrino searches. After selection using a neural network, we observe 38 events in the combined SK-I and SK-II data corresponding to 2285.1 days of exposure, with an estimated signal to background ratio of 1.6 to 1. Proton identification was also applied to a direct search for charged-current quasi-elastic (CCQE) events, obtaining a high precision sample of fully kinematically reconstructed atmospheric neutrinos, which has not been previously reported in water Cherenkov detectors. The CCQE fraction of this sample is 55%, and its neutrino (as opposed to anti-neutrino) fraction is 91.7+/-3%. We selected 78 mu-like and 47 e-like events in the SK-I and SK-II data set. With this data, a clear zenith angle distortion of the neutrino direction itself is reported in a sub-GeV sample of muon neutrinos where the lepton angular correlation to the incoming neutrino is weak. Our fit to nu_mu->nu_tau oscillations using the neutrino L/E distribution of the CCQE sample alone yields a wide acceptance region compatible with our previous results and excludes the no-oscillation hypothesis at 3 sigma., Comment: 23 pages, 22 figures. Corrected typos, replaced some figures. Version accepted for publication in Phys. Rev. D

Published
2009

8. Search for Proton Decay viap→e+π0andp→μ+π0in a Large Water Cherenkov Detector

Author

N. Tamura, Song Chen, David William Casper, T. Ishizuka, Y. Heng, J. L. Stone, H. Ogawa, A. T. Suzuki, Yuichi Oyama, N. Tanimoto, J. P. Cravens, T. Iida, K. Ueshima, C. W. Walter, T. Nakadaira, R. Terri, W. R. Kropp, K. Nakamura, T. Tanaka, K. Kaneyuki, Makoto Sakuda, Atsushi Takeda, C. Ishihara, C. K. Jung, K. Abe, S. Yamada, I. Higuchi, T. Sekiguchi, K. Bays, H. Okazawa, M. Fechner, W. Wang, A. Minamino, H. Nishino, T. Tsukamoto, Yasunari Suzuki, Hiroyuki Sekiya, Masato Shiozawa, Y. Choi, Y. Fukuda, S. Moriyama, L. R. Sulak, Masayuki Nakahata, S. Mine, Y. Takeuchi, M. B. Smy, B. S. Yang, T. Kobayashi, H. Seo, S. Hazama, T. Kajita, Koh Ueno, Michael Litos, S. Matsuno, K. Sakashita, H. W. Sobel, T. Ishida, R. J. Wilkes, G. Mitsuka, C. McGrew, S. Clark, Hiroshi Watanabe, Y. Furuse, C. Yanagisawa, M. Goldhaber, Y. Hayato, C. Regis, Takehisa Hasegawa, J. L. Raaf, K. Nishikawa, D. Kielczewska, Frédéric Dufour, K. Nishijima, Minoru Yoshida, Y. Watanabe, G. D. Lopez, S. Dazeley, Robert Svoboda, Y. Idehara, Y. Yokosawa, Shigeki Tasaka, E. Kearns, Y. Obayashi, Y. Kuno, M. Koshiba, Masashi Yokoyama, M. Ikeda, Ko Okumura, Tsuyoshi Nakaya, Ken-ichiro Kobayashi, Y. Takenaga, M. Miura, E. Thrane, J. G. Learned, Yusuke Koshio, J. S. Jang, S. B. Kim, J. Y. Kim, Zishuo Yang, Kate Scholberg, M. R. Vagins, John Hill, W. E. Keig, I. T. Lim, Yoshitaka Itow, Y. Totsuka, T. Ishii, H. Zhang, J. Kameda, S. Nakayama, R. A. Wendell, and K. S. Ganezer

Subjects
Nuclear physics, Physics, Antiparticle, Particle decay, Muon, Pair production, Meson, Proton, Proton decay, Analytical chemistry, General Physics and Astronomy, Nucleon
Abstract

We have searched for proton decays via p-->e;{+}pi;{0} and p-->micro;{+}pi;{0} using data from a 91.7 kt.yr exposure of Super-Kamiokande-I and a 49.2 kt.yr exposure of Super-Kamiokande-II. No candidate events were observed with expected backgrounds induced by atmospheric neutrinos of 0.3 events for each decay mode. From these results, we set lower limits on the partial lifetime of 8.2 x 10;{33} and 6.6 x 10;{33} years at 90% confidence level for p-->e;{+}pi;{0} and p-->micro;{+}pi;{0} modes, respectively.

Published
2009

9. Search for Neutrinos from GRB 080319B at Super-Kamiokande

Author

E. Thrane, K. Abe, Y. Hayato, T. Iida, M. Ikeda, J. Kameda, K. Kobayashi, Y. Koshio, M. Miura, S. Moriyama, M. Nakahata, S. Nakayama, Y. Obayashi, H. Ogawa, H. Sekiya, M. Shiozawa, Y. Suzuki, A. Takeda, Y. Takenaga, Y. Takeuchi, K. Ueno, K. Ueshima, H. Watanabe, S. Yamada, M. R. Vagins, S. Hazama, I. Higuchi, C. Ishihara, T. Kajita, K. Kaneyuki, G. Mitsuka, H. Nishino, K. Okumura, N. Tanimoto, F. Dufour, E. Kearns, M. Litos, J. L. Raaf, J. L. Stone, L. R. Sulak, M. Goldhaber, K. Bays, D. Casper, J. P. Cravens, W. R. Kropp, S. Mine, C. Regis, M. B. Smy, H. W. Sobel, K. S. Ganezer, J. Hill, W. E. Keig, J. S. Jang, I. S. Jeong, J. Y. Kim, I. T. Lim, M. Fechner, K. Scholberg, C. W. Walter, R. Wendell, S. Tasaka, J. G. Learned, S. Matsuno, Y. Watanabe, T. Hasegawa, T. Ishida, T. Ishii, T. Kobayashi, T. Nakadaira, K. Nakamura, K. Nishikawa, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, A. T. Suzuki, A. K. Ichikawa, A. Minamino, T. Nakaya, M. Yokoyama, S. Dazeley, R. Svoboda, A. Habig, Y. Fukuda, Y. Itow, T. Tanaka, C. K. Jung, G. Lopez, C. McGrew, C. Yanagisawa, N. Tamura, Y. Idehara, H. Ishino, A. Kibayashi, M. Sakuda, Y. Kuno, M. Yoshida, S. B. Kim, B. S. Yang, T. Ishizuka, H. Okazawa, Y. Choi, H. K. Seo, Y. Furuse, K. Nishijima, Y. Yokosawa, M. Koshiba, Y. Totsuka, S. Chen, G. Gong, Y. Heng, T. Xue, Z. Yang, H. Zhang, D. Kielczewska, P. Mijakowski, H. G. Berns, K. Connolly, M. Dziomba, and R. J. Wilkes

Subjects
Physics, Muon, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Astronomy and Astrophysics, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Fluence, Space and Planetary Science, Coincident, High Energy Physics::Experiment, Limit (mathematics), Neutrino, Super-Kamiokande, Gamma-ray burst, Astrophysics - High Energy Astrophysical Phenomena
Abstract

We perform a search for neutrinos coincident with GRB 080319B, the brightest GRB observed to date, in a +/- 1,000 s window. No statistically significant coincidences were observed and we thereby obtain an upper limit on the fluence of neutrino-induced muons from this source. From this we apply reasonable assumptions to derive a limit on neutrino fluence from the GRB., Comment: Accepted for publication in ApJ, May 2009 issue. 10 pages, 1 figure, 3 tables

Published
2009

10. Search for proton decay via p--e+pi0 and p--micro+pi0 in a large water Cherenkov detector

Author

H, Nishino, S, Clark, K, Abe, Y, Hayato, T, Iida, M, Ikeda, J, Kameda, K, Kobayashi, Y, Koshio, M, Miura, S, Moriyama, M, Nakahata, S, Nakayama, Y, Obayashi, H, Ogawa, H, Sekiya, M, Shiozawa, Y, Suzuki, A, Takeda, Y, Takenaga, Y, Takeuchi, K, Ueno, K, Ueshima, H, Watanabe, S, Yamada, S, Hazama, I, Higuchi, C, Ishihara, T, Kajita, K, Kaneyuki, G, Mitsuka, K, Okumura, N, Tanimoto, M R, Vagins, F, Dufour, E, Kearns, M, Litos, J L, Raaf, J L, Stone, L R, Sulak, W, Wang, M, Goldhaber, S, Dazeley, R, Svoboda, K, Bays, D, Casper, J P, Cravens, W R, Kropp, S, Mine, C, Regis, M B, Smy, H W, Sobel, K S, Ganezer, J, Hill, W E, Keig, J S, Jang, J Y, Kim, I T, Lim, M, Fechner, K, Scholberg, C W, Walter, R, Wendell, S, Tasaka, J G, Learned, S, Matsuno, Y, Watanabe, T, Hasegawa, T, Ishida, T, Ishii, T, Kobayashi, T, Nakadaira, K, Nakamura, K, Nishikawa, Y, Oyama, K, Sakashita, T, Sekiguchi, T, Tsukamoto, A T, Suzuki, A, Minamino, T, Nakaya, M, Yokoyama, Y, Fukuda, Y, Itow, T, Tanaka, C K, Jung, G, Lopez, C, McGrew, R, Terri, C, Yanagisawa, N, Tamura, Y, Idehara, M, Sakuda, Y, Kuno, M, Yoshida, S B, Kim, B S, Yang, T, Ishizuka, H, Okazawa, Y, Choi, H K, Seo, Y, Furuse, K, Nishijima, Y, Yokosawa, M, Koshiba, Y, Totsuka, S, Chen, Y, Heng, Z, Yang, H, Zhang, D, Kielczewska, E, Thrane, and R J, Wilkes

Abstract

We have searched for proton decays via p--e;{+}pi;{0} and p--micro;{+}pi;{0} using data from a 91.7 kt.yr exposure of Super-Kamiokande-I and a 49.2 kt.yr exposure of Super-Kamiokande-II. No candidate events were observed with expected backgrounds induced by atmospheric neutrinos of 0.3 events for each decay mode. From these results, we set lower limits on the partial lifetime of 8.2 x 10;{33} and 6.6 x 10;{33} years at 90% confidence level for p--e;{+}pi;{0} and p--micro;{+}pi;{0} modes, respectively.

Published
2009

11. First Study of Neutron Tagging with a Water Cherenkov Detector

Author

Minoru Yoshida, Shoei Nakayama, Y. Totsuka, T. Tsukamoto, T. Ishii, Michael Litos, K. Ueshima, Zhi Deng, W. R. Kropp, Y. Takenaga, Yuichi Oyama, C. McGrew, S. Clark, B. S. Yang, T. Ishida, M. Miura, Y. Idehara, Y. Hayato, R. Wendel, Y. Furuse, S. Yamada, W. Wang, Y. Takeuchi, N. Tanimoto, J. Y. Kim, Shigeki Tasaka, S. Dazeley, T. Nakadaira, T. Iida, I. Higuchi, K. Abe, H. W. Sobel, K. Sakashita, T. Xue, S. Mine, Lawrence Sulak, G. Guillian, Makoto Sakuda, R. J. Wilkes, Haruki Watanabe, C. Regis, C. K. Jung, D. Kielczewska, I. T. Lim, H. Nishino, M. Fechner, M. Goldhaber, Y. Watanabe, G. Gong, A. Sarrat, I. S. Jeong, Atsumu Suzuki, C. Yanagisawa, N. Tamura, Masato Shiozawa, Y. Choi, Todd Haines, C. W. Walter, M. D. Messier, Shaomin Chen, T. Kobayashi, Y. Yokosawa, Kyoshi Nishijima, E. Kearns, Y. Obayashi, J. L. Stone, Yusuke Koshio, S. Hazama, David William Casper, R. Gran, J. S. Jang, Koji Nakamura, Shigetaka Moriyama, H. Ogawa, Hiroyuki Sekiya, Atsushi Takeda, H. G. Berns, M. Ikeda, Soo-Bong Kim, Y. Fukuda, Masashi Yokoyama, R. Svoboda, Shantanu Desai, J. Griskevich, Masayuki Nakahata, Takehisa Hasegawa, J. G. Learned, Michael B. Smy, Alec Habig, Yueh-Feng Liu, Tsuyoshi Nakaya, H. Seo, Ken-ichiro Kobayashi, Yoshitaka Itow, J. Kameda, K. K. Shiraishi, G. Mitsuka, Mark R. Vagins, Hirokazu Ishino, C. Ishihara, Frédéric Dufour, John Hill, W. E. Keig, R. Terri, A. Minamino, K. S. Ganezer, D. W. Liu, E. Thrane, H. Okazawa, Kate Scholberg, K. Ueno, A. K. Ichikawa, K. Kaneyuki, T. Sekiguchi, K. Bays, Takaaki Tanaka, Yasunari Suzuki, J. Dunmore, K. Nishikawa, Ko Okumura, A. Kibayashi, J. P. Cravens, S. Likhoded, Y. Kuno, S. Matsuno, Takaaki Kajita, Masatoshi Koshiba, Huaqiao Zhang, T. Ishizuka, and J. L. Raaf

Subjects
Physics, Cherenkov detector, Physics::Instrumentation and Detectors, Detector, FOS: Physical sciences, Astronomy and Astrophysics, Photon energy, Coincidence, Neutron temperature, law.invention, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), law, Neutron, High Energy Physics::Experiment, Cherenkov radiation
Abstract

A first study of neutron tagging is conducted in Super--Kamiokande, a 50,000-ton water Cherenkov detector. The tagging efficiencies of thermal neutrons are evaluated in a 0.2 % GdCl$_{3}$-water solution and pure water. They are determined to be, respectively, 66.7 % for events above 3 MeV and 20 % with corresponding background probabilities of 2 $\times$ 10$^{-4}$ and 3 $\times$ 10$^{-2}$. This newly developed technique may enable water Cherenkov detectors to identify $\bar \nu_{e}$'s geological or astrophysical sources as well as those produced by commercial reactors via the delayed coincidence scheme., Comment: 17 pages, 11 figures

Published
2008
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12. AN INDIRECT SEARCH FOR WEAKLY INTERACTING MASSIVE PARTICLES IN THE SUN USING 3109.6 DAYS OF UPWARD-GOING MUONS IN SUPER-KAMIOKANDE

Author

H. W. Sobel, J. S. Jang, Michael Litos, Atsushi Takeda, K. Connolly, Yoshitaka Itow, C. Regis, S. B. Kim, J. Y. Kim, Y. Totsuka, J. L. Raaf, Y. Takeuchi, T. McLachlan, Hirokazu Ishino, T. Kajita, T. Wongjirad, A. T. Suzuki, J. G. Learned, D. Kielczewska, J. P. Cravens, C. McGrew, M. Dziomba, Yuichi Oyama, T. Nakadaira, Shigeki Tasaka, John Hill, Y. Hayato, Makoto Sakuda, G. D. Lopez, W. E. Keig, E. Kearns, K. Nishikawa, Y. Yokosawa, T. Sekiguchi, S. Moriyama, Masashi Yokoyama, Y. Obayashi, M. R. Vagins, Y. Heng, K. Bays, Masayuki Nakahata, T. Ishii, K. Sakashita, H. Okazawa, T. Ishizuka, Yasunari Suzuki, H. Zhang, Y. Takenaga, M. Miura, Tsuyoshi Nakaya, C. K. Jung, M. Ikeda, C. W. Walter, G. Mitsuka, Masato Shiozawa, Y. Choi, Yusuke Koshio, I. T. Lim, K. Kaneyuki, S. Matsuno, M. Koshiba, S. Hazama, Y. Shimizu, S. N. Smith, A. Kibayashi, K. Nishijima, N. Tanimoto, Ko Okumura, Hiroyuki Sekiya, Y. Fukuda, K. Ueshima, Michitoshi Yoshida, Ke. Abe, N. Tamura, H. Nishino, Zishuo Yang, Kate Scholberg, T. Tanaka, R. J. Wilkes, H. Kaji, J. L. Stone, A. Minamino, Koji Nakamura, K. Martens, S. Mine, Takehisa Hasegawa, Justin Albert, Y. Kuno, Y. Watanabe, Eric Thrane, F. Dufour, Song Chen, T. Iida, L. Labarga, T. Kobayashi, T. Tsukamoto, B. S. Yang, T. Ishida, S. Nakayama, R. A. Wendell, Y. Kouzuma, L. R. Sulak, M. B. Smy, Koh Ueno, J. Kameda, P. Mijakowski, C. Ishihara, K. S. Ganezer, C. Yanagisawa, T. Yokozawa, W. R. Kropp, S. Yamada, and UAM. Departamento de Física Teórica

Subjects
Physics, High energy, Particle physics, Annihilation, Muon, Physics::Instrumentation and Detectors, Scattering, Astrophysics::High Energy Astrophysical Phenomena, Física, Astronomy and Astrophysics, WIMP, Space and Planetary Science, Dark matter, High Energy Physics::Experiment, Neutrinos, Neutrino, Atmospheric neutrino, Super-Kamiokande
Abstract

The Astrophysical Journal 742.2 (2011): 78, reproduced by permission of the AAS, We present the result of an indirect search for high energy neutrinos from Weakly Interacting Massive Particle (WIMP) annihilation in the Sun using upward-going muon (upmu) events at Super-Kamiokande. Data sets from SKI-SKIII (3109.6days) were used for the analysis. We looked for an excess of neutrino signal from the Sun as compared with the expected atmospheric neutrino background in three upmu categories: stopping, non-showering, and showering. No significant excess was observed. The 90% C.L. upper limits of upmu flux induced by WIMPs of 100GeV c-2 were 6.4 × 10-15cm -2s-1 and 4.0 × 10-15cm -2s-1 for the soft and hard annihilation channels, respectively. These limits correspond to upper limits of 4.5 × 10 -39cm-2 and 2.7 × 10-40cm-2 for spin-dependent WIMP-nucleon scattering cross sections in the soft and hard annihilation channels, respectively.

Published
2011

13. [A case of eosinophilic peritonitis with giardiasis]

Author

M, Nishino, M, Ishihara, Y, Nagayama, M, Hirano, K, Imura, S, Kazusa, Y, Yokosawa, R, Furuya, K, Mori, and H, Takahashi

Subjects
Giardiasis, Gastritis, Eosinophilia, Humans, Female, Middle Aged, Peritonitis
Published
1992

14. [A case of small cell carcinoma of the esophagus with SIADH]

Author

Y, Naruki, M, Nishino, Y, Yokosawa, H, Shimura, K, Iida, M, Suzuki, K, Mizuochi, K, Inoue, S, Otsuka, and M, Noguchi

Subjects
Inappropriate ADH Syndrome, Male, Esophageal Neoplasms, Humans, Carcinoma, Small Cell, Aged
Published
1986

18. Search for dinucleon decay into kaons in Super-Kamiokande.

Author

Litos M, Abe K, Hayato Y, Iida T, Ikeda M, Iyogi K, Kameda J, Kobayashi K, Koshio Y, Kozuma Y, Miura M, Moriyama S, Nakahata M, Nakayama S, Obayashi Y, Ogawa H, Sekiya H, Shiozawa M, Suzuki Y, Takeda A, Takenaga Y, Takeuchi Y, Ueno K, Ueshima K, Watanabe H, Yamada S, Yokozawa T, Hazama S, Ishihara C, Kaji H, Kajita T, Kaneyuki K, McLachlan T, Okumura K, Shimizu Y, Tanimoto N, Vagins MR, Kearns E, Stone JL, Sulak LR, Dufour F, Raaf JL, Henning B, Goldhaber M, Bays K, Casper D, Cravens JP, Kropp WR, Mine S, Regis C, Smy MB, Sobel HW, Ganezer KS, Hill J, Keig WE, Jang JS, Kim JY, Lim IT, Albert JB, Wongjirad T, Wendell R, Scholberg K, Walter CW, Tasaka S, Learned JG, Matsuno S, Watanabe Y, Hasegawa T, Ishida T, Ishii T, Kobayashi T, Nakadaira T, Nakamura K, Nishikawa K, Nishino H, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Suzuki AT, Minamino A, Nakaya T, Fukuda Y, Itow Y, Mitsuka G, Tanaka T, Jung CK, Lopez G, McGrew C, Terri R, Yanagisawa C, Tamura N, Ishino H, Kibayashi A, Mino S, Mori T, Sakuda M, Toyota H, Kuno Y, Yoshida M, Kim SB, Yang BS, Ishizuka T, Okazawa H, Choi Y, Nishijima K, Yokosawa Y, Koshiba M, Yokoyama M, Totsuka Y, Chen S, Heng Y, Yang Z, Zhang H, Kielczewska D, Mijakowski P, Connolly K, Dziomba M, Thrane E, and Wilkes RJ

Abstract

A search for the dinucleon decay pp → K+ K+ has been performed using 91.6  kton·yr data from Super-Kamiokande-I. This decay provides a sensitive probe of the R-parity-violating parameter λ112''. A boosted decision tree analysis found no signal candidates in the data. The expected background was 0.28±0.19 atmospheric neutrino induced events and the estimated signal detection efficiency was 12.6%±3.2%. A lower limit of 1.7×10(32)  years has been placed on the partial lifetime of the decay O16 → C14K+ K+ at 90% C.L. A corresponding upper limit of 7.8×10(-9) has been placed on the parameter λ112''.

Published
2014
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19. Coordinative interactions between porphyrins and C60, La@C82, and La2@C80.

Author

Tsuchiya T, Rudolf M, Wolfrum S, Radhakrishnan SG, Aoyama R, Yokosawa Y, Oshima A, Akasaka T, Nagase S, and Guldi DM

Subjects
Electron Transport, Models, Molecular, Molecular Conformation, Fullerenes chemistry, Lanthanum chemistry, Organometallic Compounds chemistry, Porphyrins chemistry
Abstract

For the first time, a C(60) derivative (1) and two different lanthanum metallofullerene derivatives, La@C(82)Py(2) and La(2)@C(80)Py (3), that feature a pyridyl group as a coordination site for transition-metal ions have been synthesized and integrated as electron acceptors into coordinative electron-donor/electron-acceptor hybrids. Zinc tetraphenylporphyrin (ZnP) served as an excited-state electron donor in this respect. Our investigations, by means of steady-state and time-resolved photophysical techniques found that electron transfer governs the excited-state deactivation in all of these systems, namely 1/ZnP, 2/ZnP, and 3/ZnP, whereas, in the ground state, notable electronic interactions are lacking. Variation of the electron-accepting fullerene or metallofullerene moieties provides the incentive for fine-tuning the binding constants, the charge-separation kinetics, and the charge-recombination kinetics. To this end, the binding constants, which ranged from log K(assoc) =3.94-4.38, are dominated by axial coordination, with minor contributions from the orbital overlap of the curved and planar π systems. The charge-separation and charge-recombination kinetics, which are in the order of 10(10) and 10(8) s(-1) , relate to the reduction potential of the fullerene and metallofullerenes, respectively., (Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)

Published
2013
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20. Search for proton decay via p-->e+pi0 and p-->micro+pi0 in a large water Cherenkov detector.

Author

Nishino H, Clark S, Abe K, Hayato Y, Iida T, Ikeda M, Kameda J, Kobayashi K, Koshio Y, Miura M, Moriyama S, Nakahata M, Nakayama S, Obayashi Y, Ogawa H, Sekiya H, Shiozawa M, Suzuki Y, Takeda A, Takenaga Y, Takeuchi Y, Ueno K, Ueshima K, Watanabe H, Yamada S, Hazama S, Higuchi I, Ishihara C, Kajita T, Kaneyuki K, Mitsuka G, Okumura K, Tanimoto N, Vagins MR, Dufour F, Kearns E, Litos M, Raaf JL, Stone JL, Sulak LR, Wang W, Goldhaber M, Dazeley S, Svoboda R, Bays K, Casper D, Cravens JP, Kropp WR, Mine S, Regis C, Smy MB, Sobel HW, Ganezer KS, Hill J, Keig WE, Jang JS, Kim JY, Lim IT, Fechner M, Scholberg K, Walter CW, Wendell R, Tasaka S, Learned JG, Matsuno S, Watanabe Y, Hasegawa T, Ishida T, Ishii T, Kobayashi T, Nakadaira T, Nakamura K, Nishikawa K, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Suzuki AT, Minamino A, Nakaya T, Yokoyama M, Fukuda Y, Itow Y, Tanaka T, Jung CK, Lopez G, McGrew C, Terri R, Yanagisawa C, Tamura N, Idehara Y, Sakuda M, Kuno Y, Yoshida M, Kim SB, Yang BS, Ishizuka T, Okazawa H, Choi Y, Seo HK, Furuse Y, Nishijima K, Yokosawa Y, Koshiba M, Totsuka Y, Chen S, Heng Y, Yang Z, Zhang H, Kielczewska D, Thrane E, and Wilkes RJ

Abstract

We have searched for proton decays via p-->e;{+}pi;{0} and p-->micro;{+}pi;{0} using data from a 91.7 kt.yr exposure of Super-Kamiokande-I and a 49.2 kt.yr exposure of Super-Kamiokande-II. No candidate events were observed with expected backgrounds induced by atmospheric neutrinos of 0.3 events for each decay mode. From these results, we set lower limits on the partial lifetime of 8.2 x 10;{33} and 6.6 x 10;{33} years at 90% confidence level for p-->e;{+}pi;{0} and p-->micro;{+}pi;{0} modes, respectively.

Published
2009
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21. [A case of eosinophilic peritonitis with giardiasis].

Author

Nishino M, Ishihara M, Nagayama Y, Hirano M, Imura K, Kazusa S, Yokosawa Y, Furuya R, Mori K, and Takahashi H

Subjects
Female, Gastritis complications, Humans, Middle Aged, Eosinophilia complications, Giardiasis complications, Peritonitis complications
Published
1992

22. [A case of ulcerative colitis associated with pyoderma gangrenosum].

Author

Sakai T, Nishino M, Abe Y, Kai S, Ozaki M, Imura K, Ohya T, Kazusa S, Yokosawa Y, and Suzuki M

Subjects
Adult, Colitis, Ulcerative immunology, Colitis, Ulcerative pathology, Gangrene, Humans, Male, Pyoderma immunology, Pyoderma pathology, Colitis, Ulcerative complications, Pyoderma complications
Published
1987

24. [A case of small cell carcinoma of the esophagus with SIADH].

Author

Naruki Y, Nishino M, Yokosawa Y, Shimura H, Iida K, Suzuki M, Mizuochi K, Inoue K, Otsuka S, and Noguchi M

Subjects
Aged, Humans, Male, Carcinoma, Small Cell chemically induced, Esophageal Neoplasms complications, Inappropriate ADH Syndrome etiology
Published
1986

25. [A case of multiple hormone producing tumor of the pancreas presenting WDHA syndrome].

Author

Hirano M, Kazusa S, Iida K, Yokosawa Y, Nishino M, Ohmura K, Naruki Y, Matsuo K, Mizuochi K, and Otsuka S

Subjects
Achlorhydria etiology, Adenoma, Islet Cell metabolism, Female, Humans, Hypokalemia etiology, Middle Aged, Pancreatic Neoplasms metabolism, Syndrome, Adenoma, Islet Cell complications, Diarrhea etiology, Hormones, Ectopic biosynthesis, Pancreatic Neoplasms complications, Vasoactive Intestinal Peptide biosynthesis
Published
1986

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