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17 results on '"T. Toshito"'

1. Indications of Neutrino Oscillation in a 250 km Long-Baseline Experiment

Author

David William Casper, C. W. Walter, Makoto Sakuda, C. Yanagisawa, Toshio Namba, M. H. Ahn, K. Martens, W. R. Kropp, Nobuyuki Sakurai, H. W. Sobel, S. Fukuda, Atsumu Suzuki, H. Maesaka, Takehisa Hasegawa, T. Iwashita, Minoru Yoshida, Y. Fukuda, S. H. Lim, S. B. Boyd, K. Nishikawa, S. Mine, J. L. Stone, Y. Takeuchi, K. Kaneyuki, Yuichi Oyama, E. Kearns, T. Inagaki, Shinya Yamada, Y. Totsuka, E. J. Jeon, M. Kohama, Shoei Nakayama, Koji Nakamura, S. Matsuno, H. I. Jang, Kazumasa Miyano, J. Hill, C. K. Jung, Masaya Hasegawa, M. Miura, S. B. Kim, Tomoyuki Maruyama, J. H. Choi, D. Kielczewska, Hwangseo Park, I. Kato, John G. Learned, Itsuo Nakano, L. R. Sulak, T. Ishida, A. Obayashi, E. Sharkey, Susumu Noda, H. C. Bhang, T. Ishii, N. Tamura, M. Y. Pac, Yasunari Suzuki, C. O. Kim, N. Sasao, J. S. Jang, H. Yokoyama, W. Gajewski, Kate Scholberg, Ken-ichiro Kobayashi, A. K. Ichikawa, T. Toshito, R. J. Wilkes, Shigetaka Moriyama, A. Kibayashi, J. Y. Kim, I. T. Lim, T. Hara, Shogo Nishiyama, J. Kameda, C. McGrew, M. Ishitsuka, H. So, Shigeki Aoki, J. Yoo, J. Zalipska, Takashi Kobayashi, A. Ikeda, Y. Hayato, A. L. Stachyra, Mark R. Vagins, Masato Shiozawa, Shoji Yamamoto, Tsuyoshi Nakaya, Y. Suga, F. Nakata, Beom Jun Kim, Yoshitaka Itow, Yusuke Koshio, T. Ooyabu, Masayuki Nakahata, Takaaki Kajita, C. Mauger, and A. Okada

Subjects
Physics, Tamura, Norio, Physics::Instrumentation and Detectors, Oscillation, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, High Energy Physics::Phenomenology, FOS: Physical sciences, General Physics and Astronomy, Solar neutrino problem, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), K2K experiment, Measurements of neutrino speed, High Energy Physics::Experiment, 田村, 詔生, Neutrino, Neutrino oscillation, Charged current
Abstract

The K2K experiment observes indications of neutrino oscillation: a reduction of $\nu_\mu$ flux together with a distortion of the energy spectrum. Fifty-six beam neutrino events are observed in Super-Kamiokande (SK), 250 km from the neutrino production point, with an expectation of $80.1^{+6.2}_{-5.4}$. Twenty-nine one ring $\mu$-like events are used to reconstruct the neutrino energy spectrum, which is better matched to the expected spectrum with neutrino oscillation than without. The probability that the observed flux at SK is explained by statistical fluctuation without neutrino oscillation is less than 1%., Comment: 5 pages, 3 figures embedded, LaTeX with RevTeX style, accepted for publication in PRL on December 13, 2002

Published
2003

2. SolarB8and hep Neutrino Measurements from 1258 Days of Super-Kamiokande Data

Author

Y. Watanabe, J. Hill, M. Morii, T. Toshito, Minoru Yoshida, Y. Nagashima, J. A. Goodman, Y. Oyama, S. Tasaka, W. E. Keig, Y. Hayato, C. W. Walter, Atsumu Suzuki, Yusuke Koshio, B. Lee, K. Kaneyuki, Magdalena Malek, Soo-Bong Kim, M. B. Smy, Y. Fukuda, E. Kearns, Yoshitaka Itow, K. Nishikawa, M. Takita, L. R. Price, J. Shirai, M. Koike, H. Takeuchi, A. Suzuki, B. Viren, C. Saji, E. Sharkey, S. Dazeley, G. Guillian, S. Moriyama, M. Kohama, K. Ishihara, C. Mitsuda, C. McGrew, S. Matsuno, C. K. Jung, Tsuyoshi Nakaya, Heekyong Kim, H. Okazawa, D. Kielczewska, Yoshihiro Suzuki, C. Mauger, J. Yoo, Y. Totsuka, T. Ishii, M. Goldhaber, Kunio Inoue, Masato Shiozawa, Y. Takeuchi, R. J. Wilkes, T. Barszczak, U. Golebiewska, Alec Habig, M. Earl, D. W. Liu, R. Svoboda, J. Kameda, G. W. Sullivan, Takehisa Hasegawa, Masayuki Nakahata, Y. Gando, M. Ishitsuka, Hirokazu Ishino, Y. Hatakeyama, S. Mine, Shantanu Desai, Y. Ichikawa, A. L. Stachyra, K. Miyano, Takashi Kobayashi, W. R. Kropp, Tomoyuki Maruyama, R. W. Ellsworth, J. L. Stone, Henry W. Sobel, K. Nitta, H. Fujiyasu, E. Blaufuss, Kyoshi Nishijima, T. Inagaki, M. R. Vagins, Koji Nakamura, Masatoshi Koshiba, M. Miura, W. Gajewski, Kate Scholberg, A. Kibayashi, L. R. Sulak, T. Shibata, M. D. Messier, Makoto Sakuda, S. C. Boyd, T. Ishizuka, Y. Obayashi, K. Martens, John G. Learned, K. Kobayashi, Y. Kajiyama, Shoichi Yamada, Takaaki Kajita, M. Etoh, K. S. Ganezer, Todd Haines, D. Turcan, C. Yanagisawa, A. Okada, N. Sakurai, S. Nakayama, David William Casper, A. Sakai, and D. Takemori

Subjects
Physics, Sudbury Neutrino Observatory, Particle physics, Recoil, Solar neutrino, General Physics and Astronomy, Flux, Electron, Neutrino, Super-Kamiokande, Energy (signal processing)
Abstract

Solar neutrino measurements from 1258days of data from the Super-Kamiokande detector are presented. The measurements are based on recoil electrons in the energy range 5.0{endash}20.0MeV. The measured solar neutrino flux is 2.32{+-}0.03(stat){sup +0.08}{sub {minus}0.07}(syst){times}10{sup 6} cm{sup {minus}2}s{sup {minus}1} , which is 45.1{+-}0.5(stat ){sup +1.6}{sub {minus}1.4}(syst) % of that predicted by the BP2000 SSM. The day vs night flux asymmetry ({Phi}{sub n}{minus}{Phi}{sub d})/ {Phi}{sub average} is 0.033{+-}0.022(stat){sup +0.013}{sub {minus}0.012}(syst) . The recoil electron energy spectrum is consistent with no spectral distortion. For the hep neutrino flux, we set a 90% C.L.upper limit of 40{times}10{sup 3} cm{sup {minus}2}s{sup {minus}1} , which is 4.3times the BP2000 SSM prediction.

Published
2001

3. Constraints on Neutrino Oscillations Using 1258 Days of Super-Kamiokande Solar Neutrino Data

Author

Hirokazu Ishino, H. Takeuchi, K. Kaneyuki, Makoto Sakuda, M. Ishitsuka, K. Martens, K. Kobayashi, S. Matsuno, T. Shibata, Minoru Yoshida, David William Casper, Shantanu Desai, Y. Ichikawa, A. Sakai, Y. Takeuchi, J. L. Stone, E. Blaufuss, S. Nakayama, John G. Learned, Henry W. Sobel, K. Nitta, D. Turcan, R. W. Ellsworth, Kyoshi Nishijima, A. L. Stachyra, K. Miyano, Y. Watanabe, D. Takemori, M. Etoh, G. Guillian, S. Moriyama, T. Ishii, Kunio Inoue, Tomoyuki Maruyama, C. W. Walter, T. Inagaki, Y. Hatakeyama, M. Goldhaber, B. Viren, J. Hill, M. Morii, S. Tasaka, W. E. Keig, Shoichi Yamada, Takaaki Kajita, Koji Nakamura, T. Toshito, Soo-Bong Kim, M. Takita, L. R. Price, J. Shirai, C. Yanagisawa, D. W. Liu, Yoshitaka Itow, C. K. Jung, Y. Fukuda, E. Kearns, Todd Haines, Atsumu Suzuki, D. Kielczewska, M. Miura, Takehisa Hasegawa, E. Sharkey, G. W. Sullivan, S. Fukuda, M. Koike, S. Dazeley, Masayuki Nakahata, K. Nishikawa, C. McGrew, Magdalena Malek, M. R. Vagins, N. Sakurai, A. Okada, H. Okazawa, K. Ishihara, W. Gajewski, Kate Scholberg, Yoshihiro Suzuki, H. Fujiyasu, Y. Nagashima, Y. Kajiyama, J. Kameda, K. S. Ganezer, K. B. Lee, Alec Habig, Y. Totsuka, C. Saji, J. A. Goodman, M. Earl, Takashi Kobayashi, S. C. Boyd, T. Ishizuka, Masatoshi Koshiba, Y. Obayashi, A. Kibayashi, L. R. Sulak, C. Mitsuda, R. Svoboda, R. J. Wilkes, U. Golebiewska, K. K. Young, S. Mine, M. B. Smy, M. D. Messier, M. Kohama, Heekyong Kim, C. Mauger, J. Yoo, Masato Shiozawa, T. Barszczak, Y. Gando, W. R. Kropp, A. Suzuki, Tsuyoshi Nakaya, Y. Oyama, Y. Hayato, and Yusuke Koshio

Subjects
Physics, Particle physics, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, High Energy Physics::Phenomenology, General Physics and Astronomy, Flux, Solar neutrino problem, High Energy Physics - Experiment, Nuclear physics, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, Super-Kamiokande, Neutrino oscillation, Zenith
Abstract

We report the result of a search for neutrino oscillations using precise measurements of the recoil electron energy spectrum and zenith angle variations of the solar neutrino flux from 1258 days of neutrino-electron scattering data in Super-Kamiokande. The absence of significant zenith angle variation and spectrum distortion places strong constraints on neutrino mixing and mass difference in a flux-independent way. Using the Super-Kamiokande flux measurement in addition, two allowed regions at large mixing are found., Comment: 6 pages, 4 figures, submitted to PRL

Published
2001

4. Tau Neutrinos Favored over Sterile Neutrinos in Atmospheric Muon Neutrino Oscillations

Author

C. Yanagisawa, Y. Takeuchi, S. Nakayama, H. Fujiyasu, Minoru Yoshida, S. Inaba, N. Sakurai, Y. Totsuka, K. S. Ganezer, M. Etoh, H. Takeuchi, C. Mitsuda, K. Kaneyuki, Y. Gando, C. W. Walter, R. J. Wilkes, U. Golebiewska, B. K. Kim, R. W. Ellsworth, Hirokazu Ishino, H. Okazawa, K. Kobayashi, K. K. Young, S. Fukuda, M. L. Chen, R. Svoboda, S. Mine, Todd Haines, M. Earl, T. Maruyama, T. Inagaki, J. Hill, Atsumu Suzuki, Koji Nakamura, Soo-Bong Kim, M. Takita, L. R. Price, J. Shirai, E. Blaufuss, A. Suzuki, M. Miura, Y. Fukuda, E. Kearns, Y. Obayashi, John G. Learned, Masatoshi Koshiba, A. Kibayashi, E. Sharkey, A. Okada, L. R. Sulak, J. L. Stone, G. W. Sullivan, Shoichi Yamada, Takaaki Kajita, C. Mauger, Masato Shiozawa, C. Saji, Henry W. Sobel, K. Nitta, T. Barszczak, J. Kameda, Y. Nagashima, Kyoshi Nishijima, K. Nishikawa, S. C. Boyd, T. Ishizuka, C. McGrew, Y. Watanabe, R. Sanford, M. D. Messier, J. A. Goodman, Yoshihiro Suzuki, M. Morii, K. Ishihara, T. Toshito, M. B. Smy, S. Matsuno, Osamu Sasaki, M. Kohama, Magdalena Malek, Ko Okumura, Takehisa Hasegawa, T. Ishii, Kunio Inoue, Alec Habig, Takashi Kobayashi, M. R. Vagins, W. Gajewski, Kate Scholberg, Masayuki Nakahata, G. Guillian, S. Moriyama, M. Takahashi, M. Goldhaber, M. Ishitsuka, Y. Ichikawa, A. L. Stachyra, K. Miyano, Y. Oyama, Y. Hayato, B. Viren, Yusuke Koshio, C. K. Jung, M. Takahata, D. Kielczewska, W. R. Kropp, Makoto Sakuda, K. Martens, David William Casper, A. Sakai, Yoshitaka Itow, M. Kirisawa, M. Koike, D. Takemori, S. Tasaka, W. E. Keig, and Y. Hatakeyama

Subjects
Physics, Sterile neutrino, Particle physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, High Energy Physics::Phenomenology, General Physics and Astronomy, Solar neutrino problem, High Energy Physics - Experiment, Cosmic neutrino background, Neutrino detector, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, Neutrino astronomy
Abstract

The previously published atmospheric neutrino data did not distinguish whether muon neutrinos were oscillating into tau neutrinos or sterile neutrinos, as both hypotheses fit the data. Using data recorded in 1100 live-days of the Super-Kamiokande detector, we use three complementary data samples to study the difference in zenith angle distribution due to neutral currents and matter effects. We find no evidence favoring sterile neutrinos, and reject the hypothesis at the 99% confidence level. On the other hand, we find that oscillation between muon and tau neutrinos suffices to explain all the results in hand., Comment: 9 pages with 2 figures, submitted to PRL

Published
2000

5. Limits on the Neutrino Magnetic Moment using 1496 Days of Super-Kamiokande-I Solar Neutrino Data

Author

G. Guillian, Atsumu Suzuki, K. Hayashi, C. McGrew, Y. Hayato, K. Nishikawa, T. J. Haines, E. Kearns, Toshio Namba, Y. Watanabe, John G. Learned, Y. Totsuka, S. B. Kim, J. L. Stone, T. Inagaki, Kenzo Nakamura, D. Takemori, Shoji Yamamoto, C. Saji, Yusuke Koshio, H. Maesaka, G. W. Sullivan, T. Toshito, M. Earl, M. Ishitsuka, C. K. Jung, D. Kielczewska, C. W. Walter, Katsuhiro Kobayashi, M. D. Messier, H. W. Sobel, T. Hashimoto, T. Ooyabu, Masayuki Nakahata, Takaaki Kajita, C. Mauger, Shantanu Desai, S. Ueda, Michael B. Smy, H. Seo, T. Maruyama, S. Fukuda, Yoshitaka Kuno, I. Kato, A. Okada, W. Wang, Y. Ashie, H. Okazawa, Kunio Inoue, Minoru Yoshida, M. Takita, J. Y. Kim, Mikio Morii, Takehisa Hasegawa, Yuichi Oyama, Y. Obayashi, K. S. Ganezer, K. Kaneyuki, R. Nishimura, Makoto Sakuda, Magdalena Malek, Y. Fukuda, A. K. Ichikawa, Hyosun Kim, T. Ishizuka, T. Shibata, J. Zalipska, K. Martens, S. Mine, A. Minamino, T. Sasaki, J. Kameda, Y. Takeuchi, Shinya Yamada, S. Matsuno, T. Ishida, Taichi Morita, R. W. Ellsworth, L. R. Sulak, M. Ackermann, T. Kobayashi, Y. Kajiyama, Masatoshi Koshiba, Yoshihiro Suzuki, D. W. Liu, B. Viren, Alec Habig, T. Kato, C. W. Sterner, A. Kibayashi, J. Ishii, J. A. Goodman, J. P. Cravens, E. Blaufuss, W. R. Kropp, W. Gajewski, Kate Scholberg, T. Iwashita, K. Nitta, Kyoshi Nishijima, D. Turcan, Hirokazu Ishino, Y. Nakajima, K. Ishihara, David William Casper, J. Shirai, Shigetaka Moriyama, Y. Nagashima, H. Takeuchi, Masaya Hasegawa, M. Miura, Nobuyuki Sakurai, Shoei Nakayama, K. K. Shiraishi, Shigeki Tasaka, E. Sharkey, S. Dazeley, K. Washburn, S. Hatakeyama, R. Gran, C. Mitsuda, Yoshitaka Itow, R. J. Wilkes, I. T. Lim, C. Yanagisawa, J. Yoo, Kazumasa Miyano, Masato Shiozawa, Y. Choi, T. Barszczak, J. Hill, Y. Gando, T. Ishii, R. Nambu, A. Suzuki, R. Svoboda, Tsuyoshi Nakaya, W. E. Keig, and Mark R. Vagins

Subjects
Physics, Particle physics, Magnetic moment, Physics::Instrumentation and Detectors, Solar neutrino, High Energy Physics::Phenomenology, General Physics and Astronomy, Electron, Solar neutrino problem, High Energy Physics - Experiment, Nuclear physics, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, Super-Kamiokande, Neutrino oscillation
Abstract

A search for a non-zero neutrino magnetic moment has been conducted using 1496 live days of solar neutrino data from {\SK}. Specifically, we searched for distortions to the energy spectrum of recoil electrons arising from magnetic scattering due to a non-zero neutrino magnetic moment. In the absence of clear signal, we found $\mu_{\nu} \leq 3.6 \times 10^{-10}$ $\mu_{B}$ at 90% C.L. by fitting to the Super-Kamiokande day/night spectra. The fitting took into account the effect of neutrino oscillation on the shapes of energy spectra. With additional information from other solar neutrino and KamLAND experiments constraining the oscillation region, a limit of $\mu_{\nu} \leq 1.1 \times 10^{-10}$ $\mu_{B}$ at 90% C.L. was obtained., Comment: 5 pages, 4 figures

Published
2004

6. Evidence for an oscillatory signature in atmospheric neutrino oscillations

Author

Toshio Namba, J. Yoo, J. P. Cravens, Masato Shiozawa, Shantanu Desai, Atsumu Suzuki, W. Gajewski, Kate Scholberg, Y. Totsuka, H. Maesaka, T. Sasaki, E. Kearns, Mark R. Vagins, Y. Takeuchi, Shinya Yamada, E. Blaufuss, Y. Nagashima, Masaki Ishitsuka, A. L. Stachyra, J. Zalipska, C. McGrew, J. Shirai, A. Suzuki, Takaaki Kajita, R. Nishimura, Makoto Sakuda, Y. Hayato, K. Taki, R. Svoboda, G. Guillian, A. Kibayashi, E. Sharkey, S. Dazeley, Y. Watanabe, Hirokazu Ishino, L. R. Sulak, J. Kameda, Ko Okumura, C. Yanagisawa, S. Likhoded, Yoshitaka Itow, W. R. Kropp, Shoji Yamamoto, C. W. Walter, M. Goldhaber, C. Saji, Y. Kuno, M. Takita, Y. Ashie, C. W. Sterner, Tsuyoshi Nakaya, K. Nakamura, T. Toshito, K. Washburn, K. Hayashi, S. Mine, Kunio Inoue, S. Hatakeyama, R. Gran, Y. Gando, H. Okazawa, Tomoyuki Maruyama, T. Ooyabu, A. Minamino, T. Ishida, John G. Learned, H. W. Sobel, W. Wang, Masayuki Nakahata, T. Iwashita, K. Kaneyuki, Y. Fukuda, R. Nambu, A. Sarrat, D. W. Liu, T. Ishizuka, C. K. Jung, Alec Habig, S. Matsuno, S. Ueda, Minoru Yoshida, D. Takemori, D. Kielczewska, Magdalena Malek, Todd Haines, N. Tamura, Yasunari Suzuki, Y. Choi, M. D. Messier, K. Nishikawa, G. W. Sullivan, J. L. Stone, T. Inagaki, Kazumasa Miyano, Taichi Morita, R. W. Ellsworth, T. Kobayashi, C. Mauger, Takehisa Hasegawa, Masatoshi Koshiba, J. S. Jang, T. Ishii, A. Okada, I. Kato, H. G. Berns, Yusuke Koshio, John Hill, Michael B. Smy, Katsuhiro Kobayashi, J. Ishii, Y. Takenaga, H. Seo, Masaya Hasegawa, M. Miura, David William Casper, T. Harada, C. Mitsuda, R. J. Wilkes, Y. Obayashi, J. Hosaka, K. Nitta, S. Tasaka, W. E. Keig, S. B. Kim, Kyoshi Nishijima, J. Y. Kim, D. Turcan, I. T. Lim, Y. Nakajima, K. K. Shiraishi, K. Ishihara, T. Kato, Shigetaka Moriyama, Yuichi Oyama, J. A. Goodman, Shoei Nakayama, A. K. Ichikawa, and K. S. Ganezer

Subjects
Physics, Particle physics, Tamura, Norio, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, General Physics and Astronomy, High Energy Physics - Experiment, Distribution (mathematics), Measurements of neutrino speed, 田村, 詔生, High Energy Physics::Experiment, Muon neutrino, Atmospheric neutrino, Neutrino, Signature (topology), Neutrino oscillation, Energy (signal processing)
Abstract

Muon neutrino disappearance probability as a function of neutrino flight length L over neutrino energy E was studied. A dip in the L/E distribution was observed in the data, as predicted from the sinusoidal flavor transition probability of neutrino oscillation. The observed L/E distribution constrained nu_mu nu_tau neutrino oscillation parameters; 1.9x10^-3 < Delta m^2 < 3.0x10^-3 eV^2 and \sin^2(2theta) > 0.90 at 90% confidence level., Comment: 5 pages, 5 figures, submitted to PRL

Published
2004

7. Search for Supernova Relic Neutrinos at Super-Kamiokande

Author

M. Malek, M. Morii, S. Fukuda, Y. Fukuda, M. Ishitsuka, Y. Itow, T. Kajita, J. Kameda, K. Kaneyuki, K. Kobayashi, Y. Koshio, M. Miura, S. Moriyama, M. Nakahata, S. Nakayama, T. Namba, A. Okada, T. Ooyabu, C. Saji, N. Sakurai, M. Shiozawa, Y. Suzuki, H. Takeuchi, Y. Takeuchi, Y. Totsuka, S. Yamada, S. Desai, M. Earl, E. Kearns, M. D. Messier, J. L. Stone, L. R. Sulak, C. W. Walter, M. Goldhaber, T. Barszczak, D. Casper, W. Gajewski, W. R. Kropp, S. Mine, D. W. Liu, M. B. Smy, H. W. Sobel, M. R. Vagins, A. Gago, K. S. Ganezer, W. E. Keig, R. W. Ellsworth, S. Tasaka, A. Kibayashi, J. G. Learned, S. Matsuno, D. Takemori, Y. Hayato, T. Ishii, T. Kobayashi, T. Maruyama, K. Nakamura, Y. Obayashi, Y. Oyama, M. Sakuda, M. Yoshida, M. Kohama, T. Iwashita, A. T. Suzuki, A. Ichikawa, T. Inagaki, I. Kato, T. Nakaya, K. Nishikawa, T. J. Haines, S. Dazeley, S. Hatakeyama, R. Svoboda, E. Blaufuss, J. A. Goodman, G. Guillian, G. W. Sullivan, D. Turcan, K. Scholberg, A. Habig, M. Ackermann, J. Hill, C. K. Jung, K. Martens, C. Mauger, C. McGrew, E. Sharkey, B. Viren, C. Yanagisawa, T. Toshito, C. Mitsuda, K. Miyano, T. Shibata, Y. Kajiyama, Y. Nagashima, K. Nitta, M. Takita, H. I. Kim, S. B. Kim, J. Yoo, H. Okazawa, T. Ishizuka, M. Etoh, Y. Gando, T. Hasegawa, K. Inoue, K. Ishihara, J. Shirai, A. Suzuki, M. Koshiba, Y. Hatakeyama, Y. Ichikawa, M. Koike, K. Nishijima, H. Ishino, R. Nishimura, Y. Watanabe, D. Kielczewska, H. G. Berns, S. C. Boyd, A. L. Stachyra, and R. J. Wilkes

Subjects
Physics, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, General Physics and Astronomy, Flux, Cosmic ray, Astrophysics, Upper and lower bounds, High Energy Physics - Experiment, Nuclear physics, Supernova, Positron, High Energy Physics::Experiment, Neutrino, Super-Kamiokande, Charged current
Abstract

A search for the relic neutrinos from all past core-collapse supernovae was conducted using 1496 days of data from the Super-Kamiokande detector. This analysis looked for electron-type anti-neutrinos that had produced a positron with an energy greater than 18 MeV. In the absence of a signal, 90% C.L. upper limits on the total flux were set for several theoretical models; these limits ranged from 20 to 130 nu_e bar cm^-2 s^-1. Additionally, an upper bound of 1.2 nu_e bar cm^-2 s^-1 was set for the supernova relic neutrino flux in the energy region E_nu > 19.3 MeV., Comment: 4 pages, 2 figures. Submitted to Physical Review Letters. New version includes corrections to Figure 1. Also, text has been shortened to conform with the space limitations of PRL

Published
2003

8. Search for nu(e) from the sun at Super-Kamiokande-I

Author

M. Ishitsuka, T. J. Haines, A. T. Suzuki, C. W. Walter, Shantanu Desai, Y. Ichikawa, R. Nishimura, Makoto Sakuda, J. Shirai, J. L. Stone, T. Inagaki, Hyosun Kim, Ken-ichiro Kobayashi, Yoshitaka Itow, K. Martens, Shigeki Tasaka, E. Sharkey, S. Dazeley, T. Shibata, A. L. Stachyra, M. Ackermann, E. Blaufuss, J. A. Goodman, M. D. Messier, D. W. Liu, M. Koike, Y. Fukuda, C. Mitsuda, G. Guillian, C. Mauger, D. Turcan, Y. Totsuka, Y. Takeuchi, Y. Kajiyama, K. Nishikawa, K. Nitta, A. Okada, M. L. Chen, H. G. Berns, M. Miura, S. Mine, R. J. Wilkes, Yuichi Oyama, M. Earl, A. K. Ichikawa, M. Goldhaber, L. R. Sulak, T. Ishii, Takehisa Hasegawa, K. Ishihara, M. Koshiba, Y. Nagashima, H. Takeuchi, Kazumasa Miyano, Hirokazu Ishino, S. Fukuda, M. B. Smy, Y. Hatakeyama, A. Gago, H. W. Sobel, John G. Learned, S. Nakayama, H. Okazawa, K. Kaneyuki, S. C. Boyd, T. Ishizuka, D. Takemori, S. Hatakeyama, M. Etoh, Magdalena Malek, K. S. Ganezer, R. W. Ellsworth, Mikio Morii, T. Kobayashi, Michitoshi Yoshida, Tomoyuki Maruyama, Takaaki Kajita, Kunio Inoue, Alec Habig, C. Saji, S. Matsuno, A. Kibayashi, G. W. Sullivan, Yasunari Suzuki, Y. Watanabe, David William Casper, Toshio Namba, C. Yanagisawa, W. Gajewski, Kate Scholberg, Nobuyuki Sakurai, T. Toshito, M. R. Vagins, K. Nishijima, M. Takita, J. Kameda, C. McGrew, M. Kohama, Y. Hayato, K. Nakamura, S. Moriyama, T. Ooyabu, Masayuki Nakahata, Yusuke Koshio, E. Kearns, A. Suzuki, R. Svoboda, Tsuyoshi Nakaya, Y. Gando, S. B. Kim, C. K. Jung, J. Yoo, W. E. Keig, Masato Shiozawa, T. Barszczak, J. Hill, B. Viren, D. Kielczewska, I. Kato, Y. Obayashi, W. R. Kropp, S. Yamada, and T. Iwashita

Subjects
Physics, Standard solar model, Particle physics, Solar neutrino, General Physics and Astronomy, Flux, Cosmic ray, Limit (mathematics), Monochromatic color, Neutrino, Super-Kamiokande
Abstract

We present the results of a search for low energy nu(e) from the Sun using 1496 days of data from Super-Kamiokande-I. We observe no significant excess of events and set an upper limit for the conversion probability to nu(e) of the 8B solar neutrino. This conversion limit is 0.8% (90% C.L.) of the standard solar model's neutrino flux for total energy=8-20 MeV. We also set a flux limit for monochromatic nu(e) for E(nu(e))=10-17 MeV.

Published
2002

9. Solar 8B and hep neutrino measurements from 1258 days of Super-Kamiokande data

Author

S, Fukuda, Y, Fukuda, M, Ishitsuka, Y, Itow, T, Kajita, J, Kameda, K, Kaneyuki, K, Kobayashi, Y, Koshio, M, Miura, S, Moriyama, M, Nakahata, S, Nakayama, A, Okada, N, Sakurai, M, Shiozawa, Y, Suzuki, H, Takeuchi, Y, Takeuchi, T, Toshito, Y, Totsuka, S, Yamada, S, Desai, M, Earl, E, Kearns, M D, Messier, K, Scholberg, J L, Stone, L R, Sulak, C W, Walter, M, Goldhaber, T, Barszczak, D, Casper, W, Gajewski, W R, Kropp, S, Mine, D W, Liu, L R, Price, M B, Smy, H W, Sobel, M R, Vagins, K S, Ganezer, W E, Keig, R W, Ellsworth, S, Tasaka, A, Kibayashi, J G, Learned, S, Matsuno, D, Takemori, Y, Hayato, T, Ishii, T, Kobayashi, K, Nakamura, Y, Obayashi, Y, Oyama, A, Sakai, M, Sakuda, M, Kohama, A T, Suzuki, T, Inagaki, T, Nakaya, K, Nishikawa, T J, Haines, E, Blaufuss, S, Dazeley, K B, Lee, R, Svoboda, J A, Goodman, G, Guillian, G W, Sullivan, D, Turcan, A, Habig, J, Hill, C K, Jung, K, Martens, M, Malek, C, Mauger, C, McGrew, E, Sharkey, B, Viren, C, Yanagisawa, C, Mitsuda, K, Miyano, C, Saji, T, Shibata, Y, Kajiyama, Y, Nagashima, K, Nitta, M, Takita, M, Yoshida, H I, Kim, S B, Kim, J, Yoo, H, Okazawa, T, Ishizuka, M, Etoh, Y, Gando, T, Hasegawa, K, Inoue, K, Ishihara, T, Maruyama, J, Shirai, A, Suzuki, M, Koshiba, Y, Hatakeyama, Y, Ichikawa, M, Koike, K, Nishijima, H, Fujiyasu, H, Ishino, M, Morii, Y, Watanabe, U, Golebiewska, D, Kielczewska, S C, Boyd, A L, Stachyra, R J, Wilkes, and K K, Young

Abstract

Solar neutrino measurements from 1258 days of data from the Super-Kamiokande detector are presented. The measurements are based on recoil electrons in the energy range 5.0-20.0 MeV. The measured solar neutrino flux is 2.32+/-0.03(stat)+0.08-0.07(syst)x10(6) cm(-2) x s(-1), which is 45.1+/-0.5(stat)+1.6-1.4(syst)% of that predicted by the BP2000 SSM. The day vs night flux asymmetry (Phi(n)-Phi(d))/Phi(average) is 0.033+/-0.022(stat)+0.013-0.012(syst). The recoil electron energy spectrum is consistent with no spectral distortion. For the hep neutrino flux, we set a 90% C.L. upper limit of 40x10(3) cm(-2) x s(-1), which is 4.3 times the BP2000 SSM prediction.

Published
2001

10. Evidence for an oscillatory signature in atmospheric neutrino oscillations.

Author

Ashie Y, Hosaka J, Ishihara K, Itow Y, Kameda J, Koshio Y, Minamino A, Mitsuda C, Miura M, Moriyama S, Nakahata M, Namba T, Nambu R, Obayashi Y, Shiozawa M, Suzuki Y, Takeuchi Y, Taki K, Yamada S, Ishitsuka M, Kajita T, Kaneyuki K, Nakayama S, Okada A, Okumura K, Ooyabu T, Saji C, Takenaga Y, Desai S, Kearns E, Likhoded S, Stone JL, Sulak LR, Walter CW, Wang W, Goldhaber M, Casper D, Cravens JP, Gajewski W, Kropp WR, Liu DW, Mine S, Smy MB, Sobel HW, Sterner CW, Vagins MR, Ganezer KS, Hill J, Keig WE, Jang JS, Kim JY, Lim IT, Ellsworth RW, Tasaka S, Guillian G, Kibayashi A, Learned JG, Matsuno S, Takemori D, Messier MD, Hayato Y, Ichikawa AK, Ishida T, Ishii T, Iwashita T, Kobayashi T, Maruyama T, Nakamura K, Nitta K, Oyama Y, Sakuda M, Totsuka Y, Suzuki AT, Hasegawa M, Hayashi K, Inagaki T, Kato I, Maesaka H, Morita T, Nakaya T, Nishikawa K, Sasaki T, Ueda S, Yamamoto S, Haines TJ, Dazeley S, Hatakeyama S, Svoboda R, Blaufuss E, Goodman JA, Sullivan GW, Turcan D, Scholberg K, Habig A, Fukuda Y, Jung CK, Kato T, Kobayashi K, Malek M, Mauger C, McGrew C, Sarrat A, Sharkey E, Yanagisawa C, Toshito T, Miyano K, Tamura N, Ishii J, Kuno Y, Nagashima Y, Takita M, Yoshida M, Kim SB, Yoo J, Okazawa H, Ishizuka T, Choi Y, Seo HK, Gando Y, Hasegawa T, Inoue K, Shirai J, Suzuki A, Koshiba M, Nakajima Y, Nishijima K, Harada T, Ishino H, Nishimura R, Watanabe Y, Kielczewska D, Zalipska J, Berns HG, Gran R, Shiraishi KK, Stachyra A, Washburn K, and Wilkes RJ

Abstract

Muon neutrino disappearance probability as a function of neutrino flight length L over neutrino energy E was studied. A dip in the L/E distribution was observed in the data, as predicted from the sinusoidal flavor transition probability of neutrino oscillation. The observed L/E distribution constrained nu(micro)<-->nu(tau) neutrino oscillation parameters; 1.9x10(-3)0.90 at 90% confidence level.

Published
2004
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11. Limits on the neutrino magnetic moment using 1496 days of Super-Kamiokande-I solar neutrino data.

Author

Liu DW, Ashie Y, Fukuda S, Fukuda Y, Ishihara K, Itow Y, Koshio Y, Minamino A, Miura M, Moriyama S, Nakahata M, Namba T, Nambu R, Obayashi Y, Sakurai N, Shiozawa M, Suzuki Y, Takeuchi H, Takeuchi Y, Yamada S, Ishitsuka M, Kajita T, Kaneyuki K, Nakayama S, Okada A, Ooyabu T, Saji C, Desai S, Earl M, Kearns E, Messier MD, Stone JL, Sulak LR, Walter CW, Wang W, Barszczak T, Casper D, Cravens JP, Gajewski W, Kropp WR, Mine S, Smy MB, Sobel HW, Sterner CW, Vagins MR, Ganezer KS, Hill J, Keig WE, Kim JY, Lim IT, Ellsworth RW, Tasaka S, Kibayashi A, Learned JG, Matsuno S, Takemori D, Hayato Y, Ichikawa AK, Ishida T, Ishii T, Iwashita T, Kameda J, Kobayashi T, Maruyama T, Nakamura K, Nitta K, Oyama Y, Sakuda M, Totsuka Y, Suzuki AT, Hasegawa M, Hayashi K, Inagaki T, Kato I, Maesaka H, Morita T, Nakaya T, Nishikawa K, Sasaki T, Ueda S, Yamamoto S, Haines TJ, Dazeley S, Hatakeyama S, Svoboda R, Blaufuss E, Goodman JA, Guillian G, Sullivan GW, Turcan D, Scholberg K, Habig A, Ackermann M, Jung CK, Kato T, Kobayashi K, Martens K, Malek M, Mauger C, McGrew C, Sharkey E, Viren B, Yanagisawa C, Toshito T, Mitsuda C, Miyano K, Shibata T, Ishii J, Kajiyama Y, Kuno Y, Nagashima Y, Takita M, Yoshida M, Kim HI, Kim SB, Yoo J, Okazawa H, Ishizuka T, Choi Y, Seo HK, Gando Y, Hasegawa T, Inoue K, Shirai J, Suzuki A, Koshiba M, Hashimoto T, Nakajima Y, Nishijima K, Ishino H, Morii M, Nishimura R, Watanabe Y, Kielczewska D, Zalipska J, Gran R, Shiraishi KK, Washburn K, and Wilkes RJ

Abstract

A search for a nonzero neutrino magnetic moment has been conducted using 1496 live days of solar neutrino data from Super-Kamiokande-I. Specifically, we searched for distortions to the energy spectrum of recoil electrons arising from magnetic scattering due to a nonzero neutrino magnetic moment. In the absence of a clear signal, we found micro(nu)

Published
2004
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12. Search for nu(e) from the sun at Super-Kamiokande-I.

Author

Gando Y, Fukuda S, Fukuda Y, Ishitsuka M, Itow Y, Kajita T, Kameda J, Kaneyuki K, Kobayashi K, Koshio Y, Miura M, Moriyama S, Nakahata M, Nakayama S, Namba T, Obayashi Y, Okada A, Ooyabu T, Saji C, Sakurai N, Shiozawa M, Suzuki Y, Takeuchi H, Takeuchi Y, Totsuka Y, Yamada S, Desai S, Earl M, Kearns E, Messier MD, Stone JL, Sulak LR, Walter CW, Goldhaber M, Barszczak T, Casper D, Gajewski W, Kropp WR, Mine S, Liu DW, Smy MB, Sobel HW, Vagins MR, Gago A, Ganezer KS, Hill J, Keig WE, Ellsworth RW, Tasaka S, Kibayashi A, Learned JG, Matsuno S, Takemori D, Hayato Y, Ichikawa AK, Ishii T, Kobayashi T, Maruyama T, Nakamura K, Oyama Y, Sakuda M, Yoshida M, Kohama M, Iwashita T, Suzuki AT, Inagaki T, Kato I, Nakaya T, Nishikawa K, Haines TJ, Dazeley S, Hatakeyama S, Svoboda R, Blaufuss E, Chen ML, Goodman JA, Guillian G, Sullivan GW, Turcan D, Scholberg K, Habig A, Ackermann M, Jung CK, Martens K, Malek M, Mauger C, McGrew C, Sharkey E, Viren B, Yanagisawa C, Toshito T, Mitsuda C, Miyano K, Shibata T, Kajiyama Y, Nagashima Y, Nitta K, Takita M, Kim HI, Kim SB, Yoo J, Okazawa H, Ishizuka T, Etoh M, Hasegawa T, Inoue K, Ishihara K, Shirai J, Suzuki A, Koshiba M, Hatakeyama Y, Ichikawa Y, Koike M, Nishijima K, Ishino H, Morii M, Nishimura R, Watanabe Y, Kielczewska D, Berns HG, Boyd SC, Stachyra AL, and Wilkes RJ

Abstract

We present the results of a search for low energy nu(e) from the Sun using 1496 days of data from Super-Kamiokande-I. We observe no significant excess of events and set an upper limit for the conversion probability to nu(e) of the 8B solar neutrino. This conversion limit is 0.8% (90% C.L.) of the standard solar model's neutrino flux for total energy=8-20 MeV. We also set a flux limit for monochromatic nu(e) for E(nu(e))=10-17 MeV.

Published
2003
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13. Search for supernova relic neutrinos at Super-Kamiokande.

Author

Malek M, Morii M, Fukuda S, Fukuda Y, Ishitsuka M, Itow Y, Kajita T, Kameda J, Kaneyuki K, Kobayashi K, Koshio Y, Miura M, Moriyama S, Nakahata M, Nakayama S, Namba T, Okada A, Ooyabu T, Saji C, Sakurai N, Shiozawa M, Suzuki Y, Takeuchi H, Takeuchi Y, Totsuka Y, Yamada S, Desai S, Earl M, Kearns E, Messier MD, Stone JL, Sulak LR, Walter CW, Goldhaber M, Barszczak T, Casper D, Gajewski W, Kropp WR, Mine S, Liu DW, Smy MB, Sobel HW, Vagins MR, Gago A, Ganezer KS, Keig WE, Ellsworth RW, Tasaka S, Kibayashi A, Learned JG, Matsuno S, Takemori D, Hayato Y, Ishii T, Kobayashi T, Maruyama T, Nakamura K, Obayashi Y, Oyama Y, Sakuda M, Yoshida M, Kohama M, Iwashita T, Suzuki AT, Ichikawa A, Inagaki T, Kato I, Nakaya T, Nishikawa K, Haines TJ, Dazeley S, Hatakeyama S, Svoboda R, Blaufuss E, Goodman JA, Guillian G, Sullivan GW, Turcan D, Scholberg K, Habig A, Ackermann M, Hill J, Jung CK, Martens K, Mauger C, McGrew C, Sharkey E, Viren B, Yanagisawa C, Toshito T, Mitsuda C, Miyano K, Shibata T, Kajiyama Y, Nagashima Y, Nitta K, Takita M, Kim HI, Kim SB, Yoo J, Okazawa H, Ishizuka T, Etoh M, Gando Y, Hasegawa T, Inoue K, Ishihara K, Shirai J, Suzuki A, Koshiba M, Hatakeyama Y, Ichikawa Y, Koike M, Nishijima K, Ishino H, Nishimura R, Watanabe Y, Kielczewska D, Berns HG, Boyd SC, Stachyra AL, and Wilkes RJ

Abstract

A search for the relic neutrinos from all past core-collapse supernovae was conducted using 1496 days of data from the Super-Kamiokande detector. This analysis looked for electron-type antineutrinos that had produced a positron with an energy greater than 18 MeV. In the absence of a signal, 90% C.L. upper limits on the total flux were set for several theoretical models; these limits ranged from 20 to 130 macro nu(e) cm(-2) s(-1). Additionally, an upper bound of 1.2 macro nu(e) cm(-2) s(-1) was set for the supernova relic neutrino flux in the energy region E(nu)>19.3 MeV.

Published
2003
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14. Indications of neutrino oscillation in a 250 km long-baseline experiment.

Author

Ahn MH, Aoki S, Bhang H, Boyd S, Casper D, Choi JH, Fukuda S, Fukuda Y, Gajewski W, Hara T, Hasegawa M, Hasegawa T, Hayato Y, Hill J, Ichikawa AK, Ikeda A, Inagaki T, Ishida T, Ishii T, Ishitsuka M, Itow Y, Iwashita T, Jang HI, Jang JS, Jeon EJ, Jung CK, Kajita T, Kameda J, Kaneyuki K, Kato I, Kearns E, Kibayashi A, Kielczewska D, Kobayashi K, Kim BJ, Kim CO, Kim JY, Kim SB, Kobayashi T, Kohama M, Koshio Y, Kropp WR, Learned JG, Lim SH, Lim IT, Maesaka H, Martens K, Maruyama T, Matsuno S, Mauger C, McGrew C, Mine S, Miura M, Miyano K, Moriyama S, Nakahata M, Nakamura K, Nakano I, Nakata F, Nakaya T, Nakayama S, Namba T, Nishikawa K, Nishiyama S, Noda S, Obayashi A, Okada A, Ooyabu T, Oyama Y, Pac MY, Park H, Sakuda M, Sakurai N, Sasao N, Scholberg K, Sharkey E, Shiozawa M, So H, Sobel HW, Stachyra A, Stone JL, Suga Y, Sulak LR, Suzuki A, Suzuki Y, Takeuchi Y, Tamura N, Toshito T, Totsuka Y, Vagins MR, Walter CW, Wilkes RJ, Yamada S, Yamamoto S, Yanagisawa C, Yokoyama H, Yoo J, Yoshida M, and Zalipska J

Abstract

The K2K experiment observes indications of neutrino oscillation: a reduction of nu(mu) flux together with a distortion of the energy spectrum. Fifty-six beam neutrino events are observed in Super-Kamiokande (SK), 250 km from the neutrino production point, with an expectation of 80.1(+6.2)(-5.4). Twenty-nine one ring mu-like events are used to reconstruct the neutrino energy spectrum, which is better matched to the expected spectrum with neutrino oscillation than without. The probability that the observed flux at SK is explained by statistical fluctuation without neutrino oscillation is less than 1%.

Published
2003
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15. Solar 8B and hep neutrino measurements from 1258 days of Super-Kamiokande data.

Author

Fukuda S, Fukuda Y, Ishitsuka M, Itow Y, Kajita T, Kameda J, Kaneyuki K, Kobayashi K, Koshio Y, Miura M, Moriyama S, Nakahata M, Nakayama S, Okada A, Sakurai N, Shiozawa M, Suzuki Y, Takeuchi H, Takeuchi Y, Toshito T, Totsuka Y, Yamada S, Desai S, Earl M, Kearns E, Messier MD, Scholberg K, Stone JL, Sulak LR, Walter CW, Goldhaber M, Barszczak T, Casper D, Gajewski W, Kropp WR, Mine S, Liu DW, Price LR, Smy MB, Sobel HW, Vagins MR, Ganezer KS, Keig WE, Ellsworth RW, Tasaka S, Kibayashi A, Learned JG, Matsuno S, Takemori D, Hayato Y, Ishii T, Kobayashi T, Nakamura K, Obayashi Y, Oyama Y, Sakai A, Sakuda M, Kohama M, Suzuki AT, Inagaki T, Nakaya T, Nishikawa K, Haines TJ, Blaufuss E, Dazeley S, Lee KB, Svoboda R, Goodman JA, Guillian G, Sullivan GW, Turcan D, Habig A, Hill J, Jung CK, Martens K, Malek M, Mauger C, McGrew C, Sharkey E, Viren B, Yanagisawa C, Mitsuda C, Miyano K, Saji C, Shibata T, Kajiyama Y, Nagashima Y, Nitta K, Takita M, Yoshida M, Kim HI, Kim SB, Yoo J, Okazawa H, Ishizuka T, Etoh M, Gando Y, Hasegawa T, Inoue K, Ishihara K, Maruyama T, Shirai J, Suzuki A, Koshiba M, Hatakeyama Y, Ichikawa Y, Koike M, Nishijima K, Fujiyasu H, Ishino H, Morii M, Watanabe Y, Golebiewska U, Kielczewska D, Boyd SC, Stachyra AL, Wilkes RJ, and Young KK

Abstract

Solar neutrino measurements from 1258 days of data from the Super-Kamiokande detector are presented. The measurements are based on recoil electrons in the energy range 5.0-20.0 MeV. The measured solar neutrino flux is 2.32+/-0.03(stat)+0.08-0.07(syst)x10(6) cm(-2) x s(-1), which is 45.1+/-0.5(stat)+1.6-1.4(syst)% of that predicted by the BP2000 SSM. The day vs night flux asymmetry (Phi(n)-Phi(d))/Phi(average) is 0.033+/-0.022(stat)+0.013-0.012(syst). The recoil electron energy spectrum is consistent with no spectral distortion. For the hep neutrino flux, we set a 90% C.L. upper limit of 40x10(3) cm(-2) x s(-1), which is 4.3 times the BP2000 SSM prediction.

Published
2001
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16. Constraints on neutrino oscillations using 1258 days of Super-Kamiokande solar neutrino data.

Author

Fukuda S, Fukuda Y, Ishitsuka M, Itow Y, Kajita T, Kameda J, Kaneyuki K, Kobayashi K, Koshio Y, Miura M, Moriyama S, Nakahata M, Nakayama S, Okada A, Sakurai N, Shiozawa M, Suzuki Y, Takeuchi H, Takeuchi Y, Toshito T, Totsuka Y, Yamada S, Desai S, Earl M, Kearns E, Messier MD, Scholberg K, Stone JL, Sulak LR, Walter CW, Goldhaber M, Barszczak T, Casper D, Gajewski W, Kropp WR, Mine S, Liu DW, Price LR, Smy MB, Sobel HW, Vagins MR, Ganezer KS, Keig WE, Ellsworth RW, Tasaka S, Kibayashi A, Learned JG, Matsuno S, Takemori D, Hayato Y, Ishii T, Kobayashi T, Nakamura K, Obayashi Y, Oyama Y, Sakai A, Sakuda M, Kohama M, Suzuki AT, Inagaki T, Nakaya T, Nishikawa K, Haines TJ, Blaufuss E, Dazeley S, Lee KB, Svoboda R, Goodman JA, Guillian G, Sullivan GW, Turcan D, Habig A, Hill J, Jung CK, Martens K, Malek M, Mauger C, McGrew C, Sharkey E, Viren B, Yanagisawa C, Mitsuda C, Miyano K, Saji C, Shibata T, Kajiyama Y, Nagashima Y, Nitta K, Takita M, Yoshida M, Kim HI, Kim SB, Yoo J, Okazawa H, Ishizuka T, Etoh M, Gando Y, Hasegawa T, Inoue K, Ishihara K, Maruyama T, Shirai J, Suzuki A, Koshiba M, Hatakeyama Y, Ichikawa Y, Koike M, Nishijima K, Fujiyasu H, Ishino H, Morii M, Watanabe Y, Golebiewska U, Kielczewska D, Boyd SC, Stachyra AL, Wilkes RJ, and Young KK

Abstract

We report the result of a search for neutrino oscillations using precise measurements of the recoil electron energy spectrum and zenith angle variations of the solar neutrino flux from 1258 days of neutrino-electron scattering data in Super-Kamiokande. The absence of significant zenith angle variation and spectrum distortion places strong constraints on neutrino mixing and mass difference in a flux-independent way. Using the Super-Kamiokande flux measurement in addition, two allowed regions at large mixing are found.

Published
2001
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17. Tau neutrinos favored over sterile neutrinos in atmospheric muon neutrino oscillations.

Author

Fukuda S, Fukuda Y, Ishitsuka M, Kajita T, Kameda J, Kaneyuki K, Kobayashi K, Koshio Y, Miura M, Moriyama S, Nakahata M, Nakayama S, Obayashi Y, Okada A, Okumura K, Sakurai N, Shiozawa M, Suzuki Y, Takeuchi H, Takeuchi Y, Toshito T, Totsuka Y, Yamada S, Earl M, Habig A, Kearns E, Messier MD, Scholberg K, Stone JL, Sulak LR, Walter CW, Goldhaber M, Barszczak T, Casper D, Gajewski W, Kropp WR, Mine S, Price LR, Smy M, Sobel HW, Vagins MR, Ganezer KS, Keig WE, Ellsworth RW, Tasaka S, Kibayashi A, Learned JG, Matsuno S, and Takemori D

Abstract

The previously published atmospheric neutrino data did not distinguish whether muon neutrinos were oscillating into tau neutrinos or sterile neutrinos, as both hypotheses fit the data. Using data recorded in 1100 live days of the Super-Kamiokande detector, we use three complementary data samples to study the difference in zenith angle distribution due to neutral currents and matter effects. We find no evidence favoring sterile neutrinos, and reject the hypothesis at the 99% confidence level. On the other hand, we find that oscillation between muon and tau neutrinos suffices to explain all the results in hand.

Published
2000
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