Search

Your search keyword '"W. Gajewski"' showing total 253 results
Start Over Author "W. Gajewski"
253 results on '"W. Gajewski"'

20. Analysis of cyclic combustion of solid fuels

Author

W. Gajewski, Agnieszka Kijo-Kleczkowska, and Jacek Leszczynski

Subjects
business.industry, Chemistry, General Chemical Engineering, Organic Chemistry, Energy Engineering and Power Technology, Coal combustion products, Mineralogy, Solid fuel, Combustion, Fuel Technology, Chemical engineering, Coal, Limiting oxygen concentration, sense organs, Char, Fluidized bed combustion, Combustion chamber, skin and connective tissue diseases, business
Abstract

The cyclic nature of coal particles combustion results from the movement of loose material in the flow contour of the circulating fluidized bed (CFB): the combustion chamber, the cyclone, the downcomer. The experimental results proved that the cyclic change of the oxygen concentration around coal particles, led to the vital change of both mechanism and combustion kinetics. The mathematical model of the process of coal combustion has been scientifically described whose original concept is based on the allowance for cyclic changes of concentrations of oxygen around the char particle. It enables the prognosis for change of the surface and the centre temperatures and a mass loss of the char particles during the cyclic combustion. It allows to appoint mass-rate of combustion of a char particle in the above conditions.

Published
2009

22. The Super-Kamiokande detector

Author

Kimihiro Okumura, Makoto Sakuda, B. K. Kim, S. Fukuda, K. Martens, S. Moriyama, Toshio Suzuki, Todd Haines, S. B. Boyd, M. L. Chen, T. Hasegawa, Z. Conner, M. Kitaguchi, K. Nishikawa, K. S. Ganezer, Alec Habig, M. Earl, B. Viren, J. Kameda, M. Koga, H. Okazawa, R. W. Ellsworth, A. Okada, M. Takahashi, J. S. George, K. Ishihara, Atsumu Suzuki, T. Inagaki, Shoichi Yamada, Takaaki Kajita, S. Matsuno, T. Iwashita, K. Fujita, H. G. Berns, M. Ishitsuka, S. Desai, Koji Nakamura, M. Miura, Y. Ichikawa, Mikio Morii, E. Guillian, C. K. Jung, M. Takahata, H. Nishihama, J. Hsu, K. Ito, Toshio Namba, D. Kielczewska, T. Ishii, Kunio Inoue, S. Nakayama, John G. Learned, I. Kato, M. Etoh, I. Nishiyama, T. Futagami, A. L. Stachyra, K. Miyano, C. Saji, Y. Hatakeyama, T. Hayakawa, H. Maesaka, R. A. Doyle, Florian Goebel, M. B. Smy, J. L. Stone, D. W. Liu, David William Casper, E. Ichihara, T. Hashimoto, A. K. Ichikawa, C. Yanagisawa, K. Nishijima, S. Hatakeyama, M. Kohama, Akira Hasegawa, G. W. Sullivan, Henry W. Sobel, K. Nitta, Y. Kobayashi, A. Sakai, M. Takita, M. Ackerman, Frederick Reines, L. R. Price, J. Shirai, W. Wang, T. Horiuchi, H. Takeda, V. J. Stenger, M. Masuzawa, E. Sharkey, Minoru Yoshida, Yoshitaka Itow, D. Turcan, S. Inaba, N. Sakurai, T. Takayama, Y. Kanaya, M. Kirisawa, R. Svoboda, M. Koike, J. Hill, Shuji Yamamoto, A. Kusano, K. Higuchi, Hiroaki Nishimura, Masaya Hasegawa, Y. Watanabe, K. Kaneyuki, T. Kobayashi, R. Sanford, Osamu Sasaki, Magdalena Malek, Y. Kajiyama, A. Kibayashi, L. R. Sulak, W. Doki, S. Tasaka, T. Toshito, W. E. Keig, Y. Nagashima, H. Fujiyasu, J. A. Goodman, J. T. Hong, Y. Takeuchi, F. Tsushima, C. W. Walter, Soo-Bong Kim, S. Kasuga, Y. Fukuda, E. Kearns, Y. Totsuka, M. Koshiba, Hyosun Kim, C. McGrew, Yoshihiro Suzuki, K. Kobayashi, M. Nemoto, D. Kerr, T. Maruyama, Takashi Yamaguchi, M. D. Messier, S. Echigo, T. Kato, C. Mitsuda, P. G. Halverson, R. J. Wilkes, U. Golebiewska, K. K. Young, S. Mine, Y. Obayashi, Y. Gando, E. Blaufuss, Junichi Kanzaki, C. Mauger, J. Yoo, Masato Shiozawa, T. Barszczak, T. Oyabu, A. Suzuki, Tsuyoshi Nakaya, Masayuki Nakahata, Hirokazu Ishino, L. Wai, M. Oketa, J. W. Flanagan, Hiroshi Ogawa, M. R. Vagins, H. Kobayashi, W. Gajewski, Kate Scholberg, W. R. Kropp, Y. Oyama, Y. Hayato, T. Iwamoto, and Yusuke Koshio

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, Cherenkov detector, Solar neutrino, High Energy Physics::Phenomenology, T2K experiment, law.invention, Neutrino detector, law, High Energy Physics::Experiment, Neutrino astronomy, Neutrino, Super-Kamiokande, Neutrino oscillation, Instrumentation
Abstract

Super-Kamiokande is the world's largest water Cherenkov detector, with net mass 50,000 tons. During the period April, 1996 to July, 2001, Super-Kamiokande I collected 1678 live-days of data, observing neutrinos from the Sun, Earth's atmosphere, and the K2K long-baseline neutrino beam with high efficiency. These data provided crucial information for our current understanding of neutrino oscillations, as well as setting stringent limits on nucleon decay. In this paper, we describe the detector in detail, including its site, configuration, data acquisition equipment, online and offline software, and calibration systems which were used during Super-Kamiokande I.

Published
2003

23. 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

24. Evaluation of structure and particle velocity distribution in circulating fluidised beds

Author

Zbigniew Bis, Jacek Leszczynski, and W. Gajewski

Subjects
Chemistry, General Chemical Engineering, Heat transfer, Boiler (power generation), Thermodynamics, Probability density function, Mechanics, Particle velocity, Fluidized bed combustion, Fluidization, Two-phase flow, Combustion chamber
Abstract

This paper deals with the complex problem of how to evaluate the parameters of the structure in circulating fluidised beds. Some aspects of this problem have arisen from the introduction of circulating fluidised bed boilers. The distributions of particle concentration and particle velocity reflect the random behaviour of particles in a combustion chamber. The level of particle velocity—while the boiler is in operation—has an impact on the combustion process, kinetics and heat transfer, and also on the erosion processes on the heat surfaces. A linear combination of double Maxwellian distributions has been assumed to describe a component of the distribution of particle velocity. This assumption allows us to calculate statistical moments in a different way, e.g. the mean particle velocity, granular temperature, etc. Additionally, the local structure of a circulating fluidised bed has been presented.

Published
2002

25. Determination of solar neutrino oscillation parameters using 1496 days of Super-Kamiokande-I data

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Standard solar model, Solar neutrino, High Energy Physics::Phenomenology, Solar neutrino problem, High Energy Physics - Experiment, Nuclear physics, Neutrino detector, High Energy Physics::Experiment, Neutrino, GALLEX, Super-Kamiokande, Neutrino oscillation
Abstract

A number of different fits to solar neutrino mixing and mass square difference were performed using 1496 days of Super-Kamiokande-I's solar neutrino data. These data select two allowed areas at large neutrino mixing when combined with either the solar $^8$B flux prediction of the standard solar model or the SNO interaction rate measurements. A global fit combining SK data with the solar neutrino interaction rates measured by Homestake, SNO, Gallex/GNO and SAGE prefers a single allowed area, the Large Mixing Angle solution, at the 98.9% confidence level. The mass square difference $\Delta m^2$ between the two mass eigenstates ranges from about 3 to $19\times10^{-5}$eV$^2$, while the mixing angle $\theta$ is in the range of $\tan^2\theta\approx$0.25--0.65., Comment: 10 Pages, 4 figures, submitted to Physics Letters B

Published
2002

26. Molecular analysis of inhibin A and activin A subunit gene loci in epithelial ovarian cancer

Author

Ian G. Campbell, Cornelius O. Granai, S. Depasquale, W. Gajewski, Geralyn Lambert-Messerlian, Umadevi Tantravahi, M. R. Quddus, and Margaret M. Steinhoff

Subjects
medicine.medical_specialty, endocrine system, endocrine system diseases, Protein subunit, Molecular Sequence Data, Locus (genetics), Biology, Polymerase Chain Reaction, Sensitivity and Specificity, law.invention, Loss of heterozygosity, chemistry.chemical_compound, Ovarian tumor, law, Culture Techniques, Internal medicine, Biomarkers, Tumor, medicine, Humans, Gene, Inhibin-beta Subunits, Retrospective Studies, Ovarian Neoplasms, Base Sequence, Carcinoma, Obstetrics and Gynecology, DNA, Neoplasm, Prognosis, medicine.disease, Molecular biology, female genital diseases and pregnancy complications, Activins, Gene Expression Regulation, Neoplastic, Endocrinology, chemistry, Oncology, Suppressor, Female, Ovarian cancer, DNA, hormones, hormone substitutes, and hormone antagonists, Microsatellite Repeats
Abstract

Inhibin A (alpha-betaA) and activin A (betaA-betaA) are biochemically similar proteins that generally have opposite biologic functions. For example, while inhibin (alpha subunit) is proposed to be a tumor suppressor in some types of ovarian cancer, activin appears to stimulate tumor development. Previous reports suggest that a loss of alpha inhibin subunit expression and elevated serum activin levels are associated with human epithelial ovarian cancer (EOC). Our objective was to examine the alpha inhibin subunit gene locus on chromosome 2q for evidence of loss of heterozygosity (LOH) in cases of EOC and to correlate these results with serum activin A levels measured in the same patients. Ovarian tumor and matched healthy tissue samples were collected from 22 women with EOC. DNA was extracted and subjected to PCR analysis using 10 primers, seven from chromosome 2q (alpha inhibin subunit locus) and, as a control, three from chromosome 7p (inhibin/activin betaA subunit). In addition, each patient had a preoperative serum activin A measurement using an ELISA assay. One (1/22) case of EOC demonstrated LOH for one microsatellite marker at the alpha inhibin gene locus. Thirty-six percent (8/22) of patients had an activin A level that was increased above the normal range. We conclude that loss of heterozygosity at the inhibin/activin alpha subunit locus is not frequently associated with EOC. More direct molecular analyses of the inhibin and activin genes are warranted to rule out mutations in cases of epithelial ovarian cancer.

Published
2002

27. Detection of accelerator-produced neutrinos at a distance of 250 km

Author

S.H Ahn, S An, S Aoki, H.G Berns, H.C Bhang, S Boyd, D Casper, T Chikamatsu, J.H Choi, S Echigo, M Etoh, K Fujii, S Fukuda, Y Fukuda, W Gajewski, U Golebiewska, T Hara, T Hasegawa, Y Hayato, J Hill, S.J Hong, M Ieiri, T Inada, T Inagaki, T Ishida, H Ishii, T Ishii, H Ishino, M Ishitsuka, Y Itow, T Iwashita, H.I Jang, J.S Jang, E.J Jeon, E.M Jeong, C.K Jung, T Kadowaki, T Kajita, J Kameda, K Kaneyuki, I Kato, Y Kato, E Kearns, S Kenmochi, B.H Khang, A Kibayashi, D Kielczewska, B.J Kim, C.O Kim, H.I Kim, J.H Kim, J.Y Kim, S.B Kim, S Kishi, M Kitamura, K Kobayashi, T Kobayashi, Y Kobayashi, M Kohama, D.G Koo, Y Koshio, W Kropp, G Kume, E Kusano, J.G Learned, H.K Lee, J.W Lee, S.B Lee, I.T Lim, S.H Lim, H Maesaka, K Martens, T Maruyama, S Matsuno, C Mauger, C McGrew, M Minakawa, S Mine, M Miura, S Miyamoto, K Miyano, S Moriyama, S Mukai, M Nakahata, K Nakamura, M Nakamura, I Nakano, T Nakaya, S Nakayama, K Nakayoshi, K Nishijima, K Nishikawa, S Nishiyama, S Noda, H Noumi, Y Obayashi, J.K Oh, A Okada, M Onchi, T Otaki, Y Oyama, M.Y Pac, H Park, S.H Park, S.K Park, A Sakai, M Sakuda, N Sakurai, N Sasao, K Sato, K Scholberg, E Seo, E Sharkey, K Shiino, A Shima, M Shiozawa, H So, H Sobel, A Stachyra, J.L Stone, L.R Sulak, A Suzuki, Y Suzuki, M Takasaki, M Takatsuki, K Takenaka, H Takeuchi, Y Takeuchi, N Tamura, K.H Tanaka, Y Tanaka, K Tashiro, K Tauchi, T Toshito, Y Totsuka, V Tumakov, T Umeda, M Vagins, C.W Walter, R.J Wilkes, S Yamada, T Yamaguchi, Y Yamanoi, C Yanagisawa, H Yokoyama, J Yoo, M Yoshida, and S.Y You

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, Detector, Extrapolation, FOS: Physical sciences, Coincidence, High Energy Physics - Experiment, High Energy Physics - Phenomenology, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Pion, K2K experiment, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Neutrino, Neutrino oscillation, Nuclear Experiment, Beam (structure)
Abstract

The KEK to Kamioka long-baseline neutrino experiment (K2K) has begun its investigation of neutrino oscillations suggested by atmospheric neutrino observations. Twenty-eight neutrino events have been detected in coincidence with the expected arrival time of the beam in the 22.5 kt fiducial volume of Super--Kamiokande, the far detector at 250 km distance. The expectation is 37.8+3.5-3.8, derived using measurements of neutrino interactions in a near detector and extrapolation using a beam simulation validated by a measurement of pion kinematics after production and focusing. The background is of order 10^-3 events., Comment: 6 pages, 3 embedded figures, LaTeX with RevTeX style, submitted to PRL. This version is As Submitted

Published
2001

28. 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

29. 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

30. 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

31. Update of results from the SuperKamiokande detector (June 1999)

Author

W. Gajewski

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, High Energy Physics::Phenomenology, Solar neutrino problem, Atomic and Molecular Physics, and Optics, Cosmic neutrino background, Neutrino detector, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, Neutrino astronomy, Neutrino oscillation
Abstract

The data collected in the SuperKamiokande detector as of June 1999 are presented. This review covers the complete spectrum of neutrino interactions from solar neutrinos, through the entire spectrum of atmospheric neutrinos, and ending with the neutrino beam produced at KEK for a long-baseline experiment. Different interpretations of these data as demonstrations of neutrino oscillations are discussed. The results of a search for nucleon decay are also summarized.

Published
2000

32. Search for Proton Decay throughp→ν¯K+in a Large Water Cherenkov Detector

Author

C. W. Walter, C. Mauger, M. Koshiba, A. Okada, T. Kobayashi, Y. Hatakeyama, K. Nakamura, John G. Learned, T. Futagami, M. R. Vagins, Ko Okumura, J. Hill, V. J. Stenger, S. Kasuga, Y. Fukuda, Yuichi Oyama, G. W. Sullivan, T. Hayakawa, Ken-ichiro Kobayashi, A. T. Suzuki, Masayuki Nakahata, F. Tsushima, Akira Hasegawa, Y. Takeuchi, K. Ishihara, David William Casper, Makoto Sakuda, Kunio Inoue, S. Mine, A. Sakai, Nobuyuki Sakurai, L. R. Price, J. Shirai, Yoshitaka Itow, K. Martens, M. Kirisawa, Hiroshi Ogawa, J. S. George, Y. Kanaya, K. Nishikawa, M. Koike, H. W. Sobel, Yasunari Suzuki, M. Nemoto, J. L. Stone, K. Higuchi, Shigeki Tasaka, E. Sharkey, J. Kameda, S. Hatakeyama, Osamu Sasaki, Takehisa Hasegawa, Y. Watanabe, L. R. Sulak, R. Sanford, S. Inaba, M. B. Smy, Takaaki Kajita, H. Ishino, J. A. Goodman, Kazumasa Miyano, D. Takemori, M. Takahata, Y. Kobayashi, E. Blaufuss, S. Nakayama, K. Kaneyuki, C. Saji, M. Etoh, W. Doki, H. Okazawa, K. S. Ganezer, W. Gajewski, Kate Scholberg, D. Kielczewska, Y. Totsuka, C. McGrew, M. Earl, T. Ishii, Alec Habig, H. Fujiyasu, S. Matsuno, M. Koga, Minoru Yoshida, L. Wai, Tomoyuki Maruyama, T. J. Haines, Y. Obayashi, M. Takita, M. Miura, Takashi Yamaguchi, B. Viren, M. Takahashi, W. R. Kropp, S. Yamada, M. D. Messier, S. Echigo, R. J. Wilkes, K. K. Young, C. Yanagisawa, K. Nishijima, R. W. Ellsworth, A. Kibayashi, Y. Nagashima, H. Takeuchi, B. K. Kim, W. E. Keig, M. L. Chen, M. Goldhaber, Y. Hayato, T. Iwamoto, Yusuke Koshio, S. B. Kim, A. L. Stachyra, M. Kohama, C. K. Jung, Masato Shiozawa, T. Barszczak, E. Kearns, A. Suzuki, R. Svoboda, and Junichi Kanzaki

Subjects
Nuclear physics, Physics, Particle physics, Proton, Proton decay, Cherenkov detector, law, High Energy Physics::Phenomenology, General Physics and Astronomy, High Energy Physics::Experiment, Neutrino, Lower limit, law.invention
Abstract

We present results of a search for proton decays, $p\ensuremath{\rightarrow}\overline{\ensuremath{\nu}}{K}^{+}$, using data from a $33\mathrm{kt}\ifmmode \dot{}\else \.{}\fi{}\mathrm{yr}$ exposure of the Super-Kamiokande detector. Two decay modes of the kaon, ${K}^{+}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\nu}}_{\ensuremath{\mu}}$ and ${K}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}$, were studied. The data were consistent with the background expected from atmospheric neutrinos; therefore a lower limit on the partial lifetime of the proton $\ensuremath{\tau}/B(p\ensuremath{\rightarrow}\overline{\ensuremath{\nu}}{K}^{+})$ was found to be $6.7\ifmmode\times\else\texttimes\fi{}{10}^{32}\mathrm{years}$ at $90%$ confidence level.

Published
1999

33. Measurement of the Flux and Zenith-Angle Distribution of Upward Throughgoing Muons by Super-Kamiokande

Author

L. R. Price, J. Shirai, E. Sharkey, C. K. Jung, S. Mine, M. Takahata, D. Kielczewska, J. W. Flanagan, Y. Kanaya, Hiroshi Ogawa, Takehisa Hasegawa, Y. Hayato, Y. Watanabe, R. Sanford, J. A. Goodman, Kazumasa Miyano, Minoru Yoshida, H. Okazawa, T. Iwamoto, Ken-ichiro Kobayashi, David William Casper, E. Ichihara, C. W. Walter, Yuichi Oyama, F. Tsushima, Todd Haines, W. Doki, S. Hatakeyama, Takaaki Kajita, H. Ishino, A. Sakai, Yusuke Koshio, L. Wai, Michael B. Smy, Nobuyuki Sakurai, W. E. Keig, Mark R. Vagins, Tomoyuki Maruyama, T. Kobayashi, C. Mauger, Makoto Sakuda, Junichi Kanzaki, K. Nakamura, J. Kameda, B. Viren, M. Miura, Frederick Reines, Ko Okumura, Masatoshi Koshiba, T. Hayakawa, S. Matsuno, T. Ishii, M. D. Messier, Soo-Bong Kim, S. Kasuga, Y. Fukuda, M. Goldhaber, S. Echigo, Yasunari Suzuki, K. Martens, V. J. Stenger, A. Suzuki, R. Svoboda, A. Okada, S. Tasaka, W. R. Kropp, Atsumu Suzuki, A. Kibayashi, Masayuki Nakahata, Y. Totsuka, J. L. Stone, C. Yanagisawa, K. Fujita, E. Kearns, M. L. Chen, W. Gajewski, Kate Scholberg, Kunio Inoue, C. McGrew, K. Ishihara, M. Takita, Y. Takeuchi, K. Kaneyuki, C. Saji, M. Earl, E. Blaufuss, Shinya Yamada, M. Etoh, Masato Shiozawa, K. S. Ganezer, A. L. Stachyra, John G. Learned, Yoshitaka Itow, T. Barszczak, Kyoshi Nishijima, Takashi Yamaguchi, R. W. Ellsworth, R. A. Doyle, T. Futagami, R. J. Wilkes, K. K. Young, Y. Kobayashi, G. W. Sullivan, M. Kohama, Alec Habig, J. S. George, M. Nemoto, L. R. Sulak, M. Koga, H. W. Sobel, Osamu Sasaki, D. Takemori, Shoei Nakayama, K. Nishikawa, J. Hill, Y. Nagashima, B. K. Kim, and Akira Hasegawa

Subjects
Physics, Muon, Astrophysics::High Energy Astrophysical Phenomena, General Physics and Astronomy, Flux, High Energy Physics - Experiment, Nuclear physics, Distribution (mathematics), Angular distribution, Muon flux, High Energy Physics::Experiment, Atomic physics, Super-Kamiokande, Zenith, Energy (signal processing)
Abstract

A total of 614 upward through-going muons of minimum energy 1.6 GeV are observed by Super-Kamiokande during 537 detector live days. The measured muon flux is 1.74+/-0.07(stat.)+/-0.02(sys.)x10^{-13}cm^{-2}s^{-1}sr^{-1} compared to an expected flux of 1.97+/-0.44(theo.)x10^{-13}cm^{-2}s^{-1}sr^{-1}. The absolute measured flux is in agreement with the prediction within the errors. However, the zenith angle dependence of the observed upward through-going muon flux does not agree with no-oscillation predictions. The observed distortion in shape is consistent with the \nu_\mu \nu_\tau oscillation hypothesis with \sin^22\theta > 0.4 and 1x10^{-3} < \Delta m^2 < 1x10^{-1} eV^{2} at 90% confidence level., Comment: 8 pages w/ 3 figures new version contains minor fixes, as it appears in PRL

Published
1999

34. Constraints on Neutrino Oscillation Parameters from the Measurement of Day-Night Solar Neutrino Fluxes at Super-Kamiokande

Author

Frederick Reines, K. Ishihara, T. Kobayashi, Kazumasa Miyano, M. Takita, Atsumu Suzuki, Shoei Nakayama, C. W. Walter, Todd Haines, Y. Totsuka, D. Takemori, E. Kearns, John G. Learned, W. Doki, C. K. Jung, M. Takahata, D. Kielczewska, Takaaki Kajita, H. Ishino, Y. Nagashima, T. Hasagawa, Takashi Yamaguchi, A. Suzuki, V. J. Stenger, C. Mauger, K. Nishikawa, T. Futagami, Y. Kanaya, T. Ishii, M. D. Messier, S. Tasaka, J. S. George, J. Hill, G. W. Sullivan, S. Echigo, R. A. Doyle, B. K. Kim, J. Hsu, K. Kaneyuki, P. G. Halverson, Soo-Bong Kim, M. Goldhaber, C. Saji, S. Kasuga, Y. Fukuda, R. Svoboda, M. Earl, M. Kohama, Minoru Yoshida, J. A. Goodman, W. R. Kropp, L. Wai, A. Okada, Y. Watanabe, R. Sanford, Y. Takeuchi, L. R. Sulak, R. J. Wilkes, Tomoyuki Maruyama, Shinya Yamada, Z. Conner, K. Fujita, K. K. Young, J. L. Stone, H. Okazawa, Y. Hayato, E. Blaufuss, K. Nakamura, David William Casper, C. Yanagisawa, Ken-ichiro Kobayashi, E. Ichihara, T. Iwamoto, H. W. Sobel, Michael B. Smy, S. Mine, A. Sakai, Yoshitaka Itow, M. Miura, Nobuyuki Sakurai, J. W. Flanagan, Yuichi Oyama, Hiroshi Ogawa, Masayuki Nakahata, T. Hayakawa, M. Etoh, A. L. Stachyra, Yusuke Koshio, F. Tsushima, W. E. Keig, Mark R. Vagins, B. Viren, K. S. Ganezer, J. Kameda, Y. Kobayashi, Osamu Sasaki, Masato Shiozawa, M. L. Chen, S. Hatakeyama, W. Gajewski, Kate Scholberg, R. W. Ellsworth, Ko Okumura, T. Barszczak, Masatoshi Koshiba, A. Kibayashi, Kunio Inoue, Kyoshi Nishijima, Makoto Sakuda, K. Martens, Junichi Kanzaki, C. McGrew, S. Matsuno, Yasunari Suzuki, Alec Habig, M. Koga, Akira Hasegawa, L. R. Price, J. Shirai, E. Sharkey, and M. Nemoto

Subjects
Physics, Sterile neutrino, Physics::Instrumentation and Detectors, Solar neutrino, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, General Physics and Astronomy, FOS: Physical sciences, Solar neutrino problem, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Neutrino detector, Measurements of neutrino speed, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Neutrino, Neutrino oscillation, Super-Kamiokande
Abstract

A search for day-night variations in the solar neutrino flux resulting from neutrino oscillations has been carried out using the 504 day sample of solar neutrino data obtained at Super-Kamiokande. The absence of a significant day-night variation has set an absolute flux independent exclusion region in the two neutrino oscillation parameter space., Comment: 11 pages, 3 figures, submitted to PRL, single-spacing

Published
1999

35. Measurement of the Solar Neutrino Energy Spectrum Using Neutrino-Electron Scattering

Author

L. R. Price, J. Shirai, D. Takemori, J. Hill, Yuichi Oyama, C. Yanagisawa, C. K. Jung, M. Takahata, M. Takita, D. Kielczewska, Y. Totsuka, E. Sharkey, Y. Nagashima, Takaaki Kajita, H. Ishino, W. E. Keig, Mark R. Vagins, C. W. Walter, R. W. Ellsworth, E. Blaufuss, Masatoshi Koshiba, F. Tsushima, M. Earl, Takashi Yamaguchi, A. Kibayashi, T. Ishii, M. D. Messier, B. K. Kim, M. Goldhaber, B. Viren, Yohei Kobayashi, M. Etoh, J. Hsu, S. Echigo, P. G. Halverson, W. R. Kropp, K. S. Ganezer, Makoto Sakuda, K. Nakamura, David William Casper, A. T. Suzuki, R. J. Wilkes, Y. Kanaya, E. Ichihara, Soo-Bong Kim, Y. Hayato, K. Fujita, C. McGrew, E. Kearns, K. K. Young, S. Kasuga, K. Martens, Y. Watanabe, A. Sakai, R. Sanford, Y. Fukuda, Masayuki Nakahata, T. Iwamoto, Y. Takeuchi, Yusuke Koshio, M. Nemoto, H. Okazawa, S. Hatakeyama, Shinya Yamada, Z. Conner, S. Nakayama, K. Kaneyuki, C. Saji, Michael B. Smy, L. R. Sulak, S. Matsuno, Junichi Kanzaki, R. A. Doyle, Yasunari Suzuki, Todd Haines, S. Mine, N. Sakurai, A. L. Stachyra, C. Mauger, Alec Habig, K. Nishikawa, M. Koga, A. Okada, J. W. Flanagan, Masato Shiozawa, M. Kohama, Hiroshi Ogawa, J. L. Stone, T. Barszczak, J. S. George, J. A. Goodman, V. J. Stenger, Takehisa Hasegawa, A. Suzuki, R. Svoboda, Ko Okumura, Kunio Inoue, T. Kobayashi, W. Gajewski, Kate Scholberg, Frederick Reines, K. Ishihara, L. Wai, Tomoyuki Maruyama, H. W. Sobel, Osamu Sasaki, Kyoshi Nishijima, T. Hayakawa, Minoru Yoshida, G. W. Sullivan, John G. Learned, M. Miura, T. Futagami, Ken-ichiro Kobayashi, Yoshitaka Itow, J. Kameda, M. L. Chen, Kazumasa Miyano, W. Doki, S. Tasaka, and Akira Hasegawa

Subjects
Physics, Particle physics, Scattering, Physics::Instrumentation and Detectors, Solar neutrino, General Physics and Astronomy, Solar neutrino problem, High Energy Physics - Experiment, Nuclear physics, Recoil, Neutrino detector, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, Neutrino oscillation
Abstract

A measurement of the energy spectrum of recoil electrons from solar neutrino scattering in the Super--Kamiokande detector is presented. The results shown here are obtained from 504 days of data taken between the 31st of May, 1996 and the 25th of March, 1998. The shape of the measured spectrum is compared with the expectation for solar B8 neutrinos. The comparison takes into account both kinematic and detector related effects in the measurement process. The spectral shape comparison between the observation and the expectation gives a chi-square of 25.3 with 15 degrees of freedom, corresponding to a 4.6% confidence level., Comment: 12 pages, 3 figures

Published
1999

36. Calibration of Super-Kamiokande using an electron LINAC

Author

S. Matsuno, Ko Okumura, B. Viren, Akira Hasegawa, L. R. Price, J. Shirai, C. W. Walter, Shigeki Tasaka, E. Sharkey, Hiroshi Ogawa, Takehisa Hasegawa, Y. Nagashima, B. K. Kim, W. R. Kropp, J. A. Goodman, David William Casper, E. Ichihara, Kunio Inoue, Makoto Sakuda, Soo-Bong Kim, S. Kasuga, Y. Fukuda, K. Fujita, A. Sakai, Nobuyuki Sakurai, Y. Hayato, Tomoyuki Maruyama, Takaaki Kajita, H. Ishino, Masatoshi Koshiba, A. Kibayashi, Y. Takeuchi, T. Iwamoto, A. Okada, K. Nishikawa, Shinya Yamada, Y. Totsuka, Yuichi Oyama, C. K. Jung, M. Takahata, T. Ishii, J.W Flanagan, H. Kobayashi, V. J. Stenger, S Mine, Michael B. Smy, D. Kielczewska, Y. Kobayashi, Yusuke Koshio, Z. Conner, Masayuki Nakahata, W. Gajewski, Kate Scholberg, John G. Learned, Atsumu Suzuki, F. Tsushima, A. L. Stachyra, D. Takemori, M. Etoh, E. Kearns, T. Futagami, Alec Habig, Yasunari Suzuki, J. Hsu, M. Earl, M. Koga, L. Wai, Minoru Yoshida, M. Nemoto, Frederick Reines, C. Mauger, M. Goldhaber, K. S. Ganezer, G. W. Sullivan, K. Kaneyuki, C. Saji, Mark R. Vagins, H. Okazawa, E. Blaufuss, Masato Shiozawa, J. S. George, L. R. Sulak, R. A. Doyle, C. Yanagisawa, S. Hatakeyama, T. J. Haines, T. Barszczak, Kyoshi Nishijima, M. Miura, K. Martens, R. W. Ellsworth, Ken-ichiro Kobayashi, Y. Kanaya, J. Kameda, K. Ishihara, T. Hayakawa, M. L. Chen, Y. Watanabe, R. Sanford, M. Kohama, M. Takita, C. McGrew, Shoei Nakayama, J. Hill, J. L. Stone, Koji Nakamura, Takashi Yamaguchi, Junichi Kanzaki, H. W. Sobel, Osamu Sasaki, A. Suzuki, R. Svoboda, T. Kobayashi, P. G. Halverson, R. J. Wilkes, K. K. Young, Yoshitaka Itow, M. D. Messier, S. Echigo, Kazumasa Miyano, W. Doki, and W. E. Keig

Subjects
Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Solar neutrino, Detector, Solar neutrino problem, Linear particle accelerator, High Energy Physics - Experiment, Nuclear physics, Neutrino detector, Physics::Accelerator Physics, High Energy Physics::Experiment, Neutrino, Neutrino oscillation, Super-Kamiokande, Instrumentation
Abstract

In order to calibrate the Super-Kamiokande experiment for solar neutrino measurements, a linear accelerator (LINAC) for electrons was installed at the detector. LINAC data were taken at various positions in the detector volume, tracking the detector response in the variables relevant to solar neutrino analysis. In particular, the absolute energy scale is now known with less than 1 percent uncertainty., Comment: 24 pages, 16 figures, Submitted to NIM A

Published
1999

37. Search for Proton Decay viap→e+π0in a Large Water Cherenkov Detector

Author

A. T. Suzuki, Makoto Sakuda, John G. Learned, T. Futagami, K. Martens, T. Ishizuka, M. Ota, T. Hayakawa, G. W. Sullivan, Yuichi Oyama, Frederick Reines, R. W. Ellsworth, F. Tsushima, K. Ishihara, K. Nakamura, W. Gajewski, Kate Scholberg, T. Kobayashi, E. Ichihara, Y. Kobayashi, Ken-ichiro Kobayashi, H. W. Sobel, M. D. Messier, A. Sakai, B. Viren, M. L. Chen, Y. Nagashima, Junichi Kanzaki, Nobuyuki Sakurai, A. Kusano, T. J. Haines, R. A. Doyle, S. Echigo, H. Koga, Osamu Sasaki, Masayuki Nakahata, Y. Takeuchi, E. Kearns, A. Suzuki, J. Kameda, J. W. Flanagan, P. G. Halverson, W. R. Kropp, Minoru Yoshida, Takaaki Kajita, S. Hatakeyama, M. Goldhaber, Hiroshi Ogawa, R. Svoboda, Z. Conner, J. L. Stone, S. Yamada, K. Fujita, Y. Hayato, Takehisa Hasegawa, J. A. Goodman, Masaki Mori, K. K. Young, Y. Totsuka, T. Iwamoto, M. R. Vagins, M. Kohama, C. Yanagisawa, M. Miura, J. Hsu, C. K. Jung, M. Takahata, T. Kinebuchi, M. Earl, Yusuke Koshio, W. E. Keig, Masato Shiozawa, H. Okazawa, Yoshitaka Itow, J. Wilkes, L. R. Sulak, K. Nishijima, T. Barszczak, C. W. Walter, T. Ishii, J. Hill, A. Kibayashi, M. Takita, M. Oketa, Alec Habig, Tomoyuki Maruyama, D. Takemori, S. Matsuno, M. Koga, A. L. Stachyra, S. Kasuga, Y. Fukuda, C. Mauger, Takashi Yamaguchi, A. Okada, J. S. George, K. Nishikawa, Kazumasa Miyano, S. Nakayama, M. Nemoto, M. Etoh, K. S. Ganezer, S. B. Kim, Akira Hasegawa, L. R. Price, W. Doki, Shigeki Tasaka, E. Sharkey, M. Koshiba, Ko Okumura, Hirokazu Ishino, Kunio Inoue, Yasunari Suzuki, L. Wai, E. Blaufuss, K. Kaneyuki, C. Saji, C. McGrew, V. J. Stenger, Y. Kitaguchi, Y. Kanaya, Y. Watanabe, R. Sanford, and D. Kielczewska

Subjects
Physics, Particle decay, Particle physics, Proton, Cherenkov detector, law, Proton decay, General Physics and Astronomy, Neutrino, Lower limit, law.invention
Abstract

We have searched for proton decay via $p\ensuremath{\rightarrow}{e}^{+}{\ensuremath{\pi}}^{0}$ using data from a $25.5\mathrm{kton}\ifmmode \dot{}\else \.{}\fi{}\mathrm{yr}$ exposure of the Super-Kamiokande detector. We find no candidate events with an expected background induced by atmospheric neutrinos of 0.1 events. From these data, we set a lower limit on the partial lifetime of the proton $\ensuremath{\tau}{/B}_{p\ensuremath{\rightarrow}{e}^{+}{\ensuremath{\pi}}^{0}}$ to be $1.6\ifmmode\times\else\texttimes\fi{}{10}^{33}\mathrm{years}$ at a 90% confidence level.

Published
1998

38. Measurements of the Solar Neutrino Flux from Super-Kamiokande's First 300 Days

Author

T. Hayakawa, R. A. Doyle, T. Yamaguchi, J. A. Goodman, C. McGrew, M. Kohama, Y. Hayato, John G. Learned, T. Futagami, T. Ishizuka, A. T. Suzuki, Masayuki Nakahata, T. Iwamoto, M. Ota, S. Hatakeyama, Yusuke Koshio, R. W. Ellsworth, G. W. Sullivan, Minoru Yoshida, W. E. Keig, Mark R. Vagins, Masatoshi Koshiba, H. Okazawa, H. W. Sobel, Ko Okumura, M. Masuzawa, A. Kibayashi, Y. Totsuka, Osamu Sasaki, J. L. Stone, Yohei Kobayashi, M. Miura, Makoto Sakuda, J. T. Hong, H. Koga, Y. Kitaguchi, Yuichi Oyama, T. Kinebuchi, S. B. Kim, N. Sakurai, Y. Takeuchi, Takaaki Kajita, H. Ishino, M. Goldhaber, Kunio Inoue, Masaki Mori, M. Earl, T. Maruyama, Frederick Reines, T. Ishii, W. R. Kropp, Akira Hasegawa, F. Tsushima, J. Hsu, K. Nakamura, Shinya Yamada, Z. Conner, J. S. George, J. W. Flanagan, Hiroshi Ogawa, K. Kobayashi, Kyoshi Nishijima, S. Nakayama, M. D. Messier, S. Echigo, A. Kusano, S. Matsuno, J. Kameda, Yasunari Suzuki, L. Wai, M. L. Chen, Takehisa Hasegawa, K. Nishikawa, K. Ishihara, M. Takita, P. G. Halverson, Todd Haines, L. R. Price, A. L. Stachyra, D. Takemori, M. Etoh, C. W. Walter, K. Martens, J. Hill, K. S. Ganezer, C. Mauger, Y. Kanaya, E. Sharkey, Y. Watanabe, R. Sanford, B. Viren, A. Okada, M. Nemoto, C. K. Jung, M. Takahata, S. Kasuga, T. Kobayashi, D. Kielczewska, Y. Fukuda, M. Oketa, Kazumasa Miyano, L. R. Sulak, W. Doki, E. Ichihara, W. Gajewski, Kate Scholberg, S. Tasaka, A. Sakai, Yoshitaka Itow, K. Fujita, Alec Habig, M. Koga, Y. Nagashima, A. Suzuki, R. Svoboda, E. Blaufuss, V. J. Stenger, Junichi Kanzaki, Masato Shiozawa, T. Barszczak, E. Kearns, J. Wilkes, K. Kaneyuki, C. Saji, K. K. Young, and C. Yanagisawa

Subjects
Physics, Standard solar model, Particle physics, Solar neutrino, General Physics and Astronomy, Flux, Electron, High Energy Physics - Experiment, Nuclear physics, Constant rate, Recoil, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Super-Kamiokande, Energy (signal processing)
Abstract

The first results of the solar neutrino flux measurement from Super-Kamiokande are presented. The results shown here are obtained from data taken between the 31st of May, 1996, and the 23rd of June, 1997. Using our measurement of recoil electrons with energies above 6.5 MeV, we infer the total flux of 8B solar neutrinos to be 2.42+-0.06(stat.)+0.10-0.07(syst.)*10^6/cm^2/s. This result is consistent with the Kamiokande measurement and is 36% of the flux predicted by the BP95 solar model. The flux is also measured in 1.5 month subsets and shown to be consistent with a constant rate., Comment: 7 pages, 3 figures

Published
1998

39. Measurement of a small atmospheric ν/ν ratio

Author

Y. Fukuda, T. Hayakawa, E. Ichihara, K. Inoue, K. Ishihara, H. Ishino, Y. Itow, T. Kajita, J. Kameda, S. Kasuga, K. Kobayashi, Y. Kobayashi, Y. Koshio, K. Martens, M. Miura, M. Nakahata, S. Nakayama, A. Okada, M. Oketa, K. Okumura, M. Ota, N. Sakurai, M. Shiozawa, Y. Suzuki, Y. Takeuchi, Y. Totsuka, S. Yamada, M. Earl, A. Habig, J.T. Hong, E. Kearns, S.B. Kim, M. Masuzawa, M.D. Messier, K. Scholberg, J.L. Stone, L.R. Sulak, C.W. Walter, M. Goldhaber, T. Barszczak, W. Gajewski, P.G. Halverson, J. Hsu, W.R. Kropp, L.R. Price, F. Reines, H.W. Sobel, M.R. Vagins, K.S. Ganezer, W.E. Keig, R.W. Ellsworth, S. Tasaka, J.W. Flanagan, A. Kibayashi, J.G. Learned, S. Matsuno, V. Stenger, D. Takemori, T. Ishii, J. Kanzaki, T. Kobayashi, K. Nakamura, K. Nishikawa, Y. Oyama, A. Sakai, M. Sakuda, O. Sasaki, S. Echigo, M. Kohama, A.T. Suzuki, T.J. Haines, E. Blaufuss, R. Sanford, R. Svoboda, M.L. Chen, Z. Conner, J.A. Goodman, G.W. Sullivan, M. Mori, F. Goebel, J. Hill, C.K. Jung, C. Mauger, C. McGrew, E. Sharkey, B. Viren, C. Yanagisawa, W. Doki, T. Ishizuka, Y. Kitaguchi, H. Koga, K. Miyano, H. Okazawa, C. Saji, M. Takahata, A. Kusano, Y. Nagashima, M. Takita, T. Yamaguchi, M. Yoshida, M. Etoh, K. Fujita, A. Hasegawa, T. Hasegawa, S. Hatakeyama, T. Iwamoto, T. Kinebuchi, M. Koga, T. Maruyama, H. Ogawa, M. Saito, A. Suzuki, F. Tsushima, M. Koshiba, M. Nemoto, K. Nishijima, T. Futagami, Y. Hayato, Y. Kanaya, K. Kaneyuki, Y. Watanabe, D. Kielczewska, R. Doyle, J. George, A. Stachyra, L. Wai, J. Wilkes, and K. Young

Subjects
Momentum, Physics, Nuclear and High Energy Physics, Particle physics, High Energy Physics::Phenomenology, Monte Carlo method, Detector, Theoretical models, High Energy Physics::Experiment, Production (computer science), Atmospheric neutrino, Nuclear Experiment, Visible energy
Abstract

From an exposure of 25.5~kiloton-years of the Super-Kamiokande detector, 900 muon-like and 983 electron-like single-ring atmospheric neutrino interactions were detected with momentum $p_e > 100$ MeV/$c$, $p_\mu > 200$ MeV/$c$, and with visible energy less than 1.33 GeV. Using a detailed Monte Carlo simulation, the ratio $(\mu/e)_{DATA}/(\mu/e)_{MC}$ was measured to be $0.61 \pm 0.03(stat.) \pm 0.05(sys.)$, consistent with previous results from the Kamiokande, IMB and Soudan-2 experiments, and smaller than expected from theoretical models of atmospheric neutrino production.

Published
1998

40. Evidence for Oscillation of Atmospheric Neutrinos

Author

Takaaki Kajita, H. Ishino, T. Ishii, T. Kobayashi, Alec Habig, L. Wai, J. Hsu, Tomoyuki Maruyama, Y. Totsuka, M. Koga, Ken-ichiro Kobayashi, Henry W. Sobel, S. Hatakeyama, D. Takemori, Kyoshi Nishijima, V. J. Stenger, M. Earl, Yoshitaka Itow, D. Casper, B. Viren, K. Nakamura, J. Kameda, Makoto Sakuda, A. L. Stachyra, Y. Kanaya, S. Nakayama, W. R. Kropp, N. Sakurai, Masayuki Nakahata, R. A. Doyle, M. Takita, M. L. Chen, S. Matsuno, P. G. Halverson, Akira Hasegawa, K. Martens, K. Fujita, Y. Watanabe, Frederick Reines, R. Sanford, L. R. Price, J. Shirai, W. Gajewski, Kate Scholberg, Osamu Sasaki, M. Kohama, Todd Haines, E. Sharkey, R. J. Wilkes, M. Goldhaber, Takashi Yamaguchi, C. McGrew, Yoshihiro Suzuki, C. Mauger, K. K. Young, S. Mine, C. K. Jung, M. Takahata, D. Kielczewska, J. S. George, Michael B. Smy, E. Ichihara, J. A. Goodman, A. Okada, J. Hill, J. W. Flanagan, Hiroshi Ogawa, M. Nemoto, E. Blaufuss, Kazumasa Miyano, A. T. Suzuki, A. Sakai, Takehisa Hasegawa, M. Etoh, T. Hayakawa, K. Ishihara, K. S. Ganezer, G. W. Sullivan, John G. Learned, H. Okazawa, W. Doki, T. Futagami, T. Barszczxak, R. W. Ellsworth, M. D. Messier, S. Tasaka, Masatoshi Koshiba, S. Echigo, Yuichi Oyama, F. Tsushima, Minoru Yoshida, C. Yanagisawa, A. Kibayashi, Yohei Kobayashi, Y. Nagashima, M. Miura, Ko Okumura, B. K. Kim, Kunio Inoue, K. Nishikawa, A. Suzuki, R. Svoboda, C. W. Walter, Soo-Bong Kim, S. Kasuga, Y. Fukuda, Y. Takeuchi, Shinya Yamada, Z. Conner, Masato Shiozawa, Lawrence Sulak, Junichi Kanzaki, Y. Hayato, T. Iwamoto, Yusuke Koshio, E. Kearns, K. Kaneyuki, C. Saji, J. L. Stone, W. E. Keig, and Mark R. Vagins

Subjects
Physics, Particle physics, Muon, Bilepton, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, General Physics and Astronomy, Solar neutrino problem, High Energy Physics - Experiment, Nuclear physics, Neutrino detector, K2K experiment, High Energy Physics::Experiment, Neutrino, Neutrino oscillation, Super-Kamiokande
Abstract

We present an analysis of atmospheric neutrino data from a 33.0 kiloton-year (535-day) exposure of the Super-Kamiokande detector. The data exhibit a zenith angle dependent deficit of muon neutrinos which is inconsistent with expectations based on calculations of the atmospheric neutrino flux. Experimental biases and uncertainties in the prediction of neutrino fluxes and cross sections are unable to explain our observation. The data are consistent, however, with two-flavor nu_mu nu_tau oscillations with sin^2(2theta)>0.82 and 5x10^-4 < delta m^2 < 6x10^-3 eV^2 at 90% confidence level., Comment: 9 pages (two-column) with 4 figures. Small corrections to Eqn.4 and Fig.3. Final version to appear in PRL

Published
1998

41. Neutrino measurements with the IMB director

Author

M. Masuzawa, J. L. Stone, J. M. LoSecco, L. R. Price, K. S. Ganezer, L. R. Sulak, W. R. Kropp, H. W. Sobel, Frederick Reines, J. Schultz, J. G. Learned, G. McGrath, Richard Miller, W. Gajewski, Stephen T. Dye, M. Goldhaber, C. McGrew, R. Becker-Szendy, S. Matsuno, Todd Haines, D. Kielczewska, D. Casper, C. B. Bratton, R. Svoboda, and P. G. Halverson

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, Solar neutrino problem, Atomic and Molecular Physics, and Optics, Nuclear physics, Neutrino detector, Measurements of neutrino speed, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Neutrino astronomy, Neutrino, Neutrino oscillation
Abstract

The measure fraction of muon-like, single-track, atmospheric neutrino events over a 7.7 kton-yr exposure of IMB is 0.36±0.02(stat)±0.02(syst) as compared to an expectation of 0.51±0.01(stat)±0.05(syst). No significant dependence of this fraction on zenith angle or momentum is seen. In addition, upward-going muons from higher energy atmospheric neutrino interactions are used to search for vμ oscillations into vτ by comparing the measured rate with the expected rate from a conservative flux calculation. The ratio of upward-going muons which stop in the detector to those which exit is also used to search for deviations from the expected energy spectrum. No evidence for oscillations is found in either analysis. Finally, a search is made for an astrophysical component to the detected neutrino flux from both energetic point sources and gamma-ray bursts and also for a possible seasonal variation of the high energy neutrino flux due to atmospheric density changes. No evidence for any of these effects if found.

Published
1995

42. Calibration of the IMB detector

Author

J. L. Stone, Sally Seidel, P. G. Halverson, D. Sinclair, G. McGrath, R. Svoboda, H. W. Sobel, R. M. Bionta, Todd Haines, Frederick Reines, M. Goldhaber, R. Becker-Szendy, J. Schultz, S. Matsuno, John Matthews, C. B. Bratton, H.-S. Park, W. Gajewski, B. Cortez, Lawrence Sulak, Richard Miller, S. Errede, C. McGrew, R. Claus, M.S. Mudan, John G. Learned, J. C. van der Velde, Craig R. Wuest, John M. LoSecco, K. S. Ganezer, T. W. Jones, D. Casper, G. W. Foster, Stephen T. Dye, W. R. Kropp, G. Thornton, L. R. Price, E. Hazen, and D. Kielczewska

Subjects
Physics, Nuclear and High Energy Physics, Photomultiplier, Hydrogen compounds, Physics::Instrumentation and Detectors, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Electronic equipment, Particle detector, Nuclear physics, Measuring instrument, High Energy Physics::Experiment, National laboratory, Instrumentation, Cherenkov radiation, Remote sensing
Abstract

The IMB detector (named after its founding institutions: University of California, Irvine, the University of Michigan and Brookhaven National Laboratory) collected data on a wide range of phenomena for over eight years. It was the first and the largest of the ring imaging water Cherenkov detectors. The detector consisted of 8000 metric tons of ultra-pure water instrumented with 2048 photomultiplier tubes (PMTs). The PMTs were placed on the roof, floor, and walls of the detector in a lattice of approximately 1 m spacing. It made measurements of contained events that ranged in energy from 15 MeV up to 1.5 GeV. This paper describes the calibration of the IMB detector. This procedure was accurate and stable over a wide range of physical variables. It was used with little change throughout the entire eight-year lifetime of the experiment. The IMB calibration is a model for future large-scale detectors that employ the water Cherenkov technique.

Published
1995

43. Transport Velocity of Coarse Particles in Multi-Solid Fluidized Bed

Author

Kyu Kyu Win, Masanobu Hasatani, Jaroslaw Krzywanski, W. Gajewski, Hitoki Matsuda, Zbigniew Bis, and Wojciech Nowak

Subjects
Imagination, Chemical substance, Chemistry, General Chemical Engineering, media_common.quotation_subject, Mineralogy, General Chemistry, Mechanics, Coarse particle, Solid circulation, law.invention, Magazine, law, Fluidized bed, Fluidization, Magnetosphere particle motion, media_common
Abstract

The transport velocity of a coarse particle in a Multi-Solid Fluidized Bed (MSFB) consisting of particles different in size and density was measured using an acoustic technique. Effects of the solid circulating rate of fine particles on the diameter of coarse particles were studied. The equation for calculating the transport velocity was established considering the collision characteristics between the fine and coarse particles. The transport velocity of coarse particles obtained by solving the related equation demonstrated a good agreement with those obtained from the experimental data. The calculated results for air-fine 50 mm and 100 mm particles coincided with the experimental results within 20% and 34% errors, respectively. Experimental results obtained in a lab-scale MSFB with a diameter of 0.05 m showed that the transport velocity of coarse particles decreased with increasing the solid circulation rate.

Published
1995

44. IMB-3: a large water Cherenkov detector for nucleon decay and neutrino interactions

Author

R. Becker-Szendy, J. M. LoSecco, K. S. Ganezer, John G. Learned, Craig R. Wuest, H.S. Park, D. Casper, E. Hazen, Todd Haines, J. Schultz, D. Kielczewska, B. Cortez, W. Gajewski, C. B. Bratton, M. Goldhaber, Frederick Reines, R.M. Bionta, L. E. Price, J. L. Stone, G. Thornton, M.S. Mudan, H. W. Sobel, C. McGrew, J. C. van der Velde, T. W. Jones, Lawrence Sulak, Richard Miller, G. W. Foster, Stephen T. Dye, G. McGrath, S. Errede, W. R. Kropp, P.G. Halverson, J. Matthews, S. Matsuno, R. Claus, Sally Seidel, D. Sinclair, and R. Svoboda

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Cherenkov detector, High Energy Physics::Phenomenology, Dark matter, Detector, Cosmic ray, Particle detector, law.invention, Nuclear physics, Neutrino detector, law, Neutrino, Neutrino oscillation, Instrumentation
Abstract

The IMB experiment, a large water Cherenkov detector which began data collection in September 1982, has undergone several upgrades to improve light collection, on-line processing power, data throughput and buffering, calibration, and operating efficiency. The current device, known as IMB-3, enjoys a factor of four light collection advantage over its precursor. Since May 1986, it has been used to search for such diverse phenomena as nucleon decay, dark matter, neutrino oscillation, and magnetic monopoles, and to study stellar collapse and cosmic rays. Due to its large size and long exposure time IMB presents unique challenges. The design and operation of the IMB-3 detector are described in detail.

Published
1993

46. Search for muon neutrino oscillations with the Irvine-Michigan-Brookhaven detector

Author

D. Kielczewska, J. Schultz, G. McGrath, C. B. Bratton, S. Matsuno, P. G. Halverson, W. R. Kropp, L. R. Sulak, Richard Miller, J. C. van der Velde, D. Casper, J. G. Learned, M. Goldhaber, H. W. Sobel, J. M. LoSecco, Frederick Reines, L. R. Price, John Matthews, T. J. Haines, W. Gajewski, J. L. Stone, M. S. Mudan, R. Becker-Szendy, D. Sinclair, R. Svoboda, Stephen T. Dye, C. McGrew, and T. Jones

Subjects
Physics, Particle physics, Muon, Physics::Instrumentation and Detectors, General Physics and Astronomy, Elementary particle, Nuclear physics, Massless particle, High Energy Physics::Experiment, Muon neutrino, Neutrino, Neutrino oscillation, Energy (signal processing), Lepton
Abstract

Muon neutrinos produced as a result of cosmic-ray interactions with the atmosphere are used to search for {nu}{sub {mu}} oscillations into {nu}{sub {tau}} by comparing the measured rate of upward-going muons in the Irvine-Michigan-Brookhaven detector with the expected rate. In addition, the ratio of upward-going muons which stop in the detector to those which exist is used to search for deviations from the expected energy spectrum. This latter technique is free of flux and cross-section normalization uncertainties. No evidence for oscillations is found. 90% C.L. limits on {delta}{ital m}{sup 2} are derived in the range (1--2){times}10{sup {minus}4} eV{sup 2} for sin{sup 2}2{theta}{gt}0.5.

Published
1992

47. A search for oscillation of atmospheric neutrinos with the IMB detector

Author

W. Gajewski

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, High Energy Physics::Phenomenology, Solar neutrino problem, Atomic and Molecular Physics, and Optics, Cosmic neutrino background, Nuclear physics, Neutrino detector, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino astronomy, Neutrino, Neutrino oscillation
Abstract

Neutrino oscillations have been studied using a flux of atmospheric neutrinos and the IMB water Cerenkov detector. The study is based on: 1) a sample of 935 events in the detector volume during 7.7 kton-yrs exposure. About 70% of events have a single track which allows identification of the parent neutrino flavor. 2) a sample of 593 up-going muon tracks from neutrino interactions in rock below the detector. These studies are sensitive to δm2 down to 10−4eV2 and sin2(2θ) > 0.4, a region unexplored in previous experiments. Future plans of long baseline neutrino oscillation studies using the IMB detector and neutrinos from artificial sources are described. They include ν e from a power reactor 13 km from the detector and νμ produced by the Main Injector at Fermilab at a distance of 570 km.

Published
1992

48. Measurement of atmospheric neutrino composition with the IMB-3 detector

Author

D. Kielczewska, R. Becker-Szendy, John G. Learned, C. McGrew, H. W. Sobel, J. Schultz, M. S. Mudan, M. Goldhaber, P. G. Halverson, David William Casper, Claus R, Frederick Reines, J. L. Stone, John Matthews, J. M. LoSecco, Todd Haines, W. R. Kropp, T. W. Jones, Stephen T. Dye, W. Gajewski, C. B. Bratton, G. Thornton, L. R. Sulak, L. R. Price, van der Velde Jc, Cady Dr, D. Sinclair, R. Svoboda, and S. Matsuno

Subjects
Physics, Particle physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, General Physics and Astronomy, Flux, Elementary particle, Fermion, Massless particle, Nuclear physics, Neutrino detector, High Energy Physics::Experiment, Production (computer science), Neutrino, Lepton
Abstract

The atmospheric neutrino flux is measured using a 3.4-kt yr exposure of the IMB-3 detector. Single-ring events are classified as showering or nonshowering using the geometry of the \ifmmode \check{C}\else \v{C}\fi{}erenkov pattern. A simulation of neutrino interactions and three models of atmospheric neutrino production are used to predict the composition of the sample. Showering-nonshowering character is strongly correlated with the flavor of the neutrino parent. In the lepton momentum range p1500 MeV/c, we find that nonshowering events comprise [41\ifmmode\pm\else\textpm\fi{}3\ifmmode\pm\else\textpm\fi{}2syst]% of the total. The fraction expected is [51\ifmmode\pm\else\textpm\fi{}5(syst)]%.

Published
1991

49. Lysenkoism in Poland

Author

W. Gajewski

Subjects
Lysenkoism, History, Library science, General Agricultural and Biological Sciences
Published
1990

50. Observation of the Anisotropy of 10 TeV Primary Cosmic Ray Nuclei Flux with the Super-Kamiokande-I Detector

Author

C. W. Walter, M. Ishitsuka, Atsushi Takeda, D. Turcan, Shantanu Desai, Y. Fukuda, K. Ishihara, K. Washburn, C. Yanagisawa, Y. Totsuka, W. Wang, J. L. Stone, T. Nakadaira, G. Mitsuka, S. Hatakeyama, R. Gran, Atsumu Suzuki, A. L. Stachyra, Michael B. Smy, Makoto Sakuda, G. Guillian, H. Okazawa, John Hill, E. Kearns, Masatoshi Koshiba, J. Griskevich, Y. Takeuchi, Shinya Yamada, Alec Habig, A. K. Ichikawa, S. Matsuno, Minoru Yoshida, R. J. Wilkes, K. Nishikawa, T. Kobayashi, M. Goldhaber, J. Shirai, Shigeki Tasaka, E. Sharkey, S. Dazeley, David William Casper, C. Mitsuda, S. Mine, T. Ishizuka, Takehisa Hasegawa, Hirokazu Ishino, J. Hosaka, H. Ogawa, Y. Takenaga, Masaya Hasegawa, M. Miura, E. Blaufuss, Y. Watanabe, J. G. Learned, A. Suzuki, C. McGrew, R. W. Ellsworth, G. W. Sullivan, Yusuke Koshio, K. Nakamura, Y. Hayato, Masashi Yokoyama, Ko Okumura, T. Ishii, K. K. Shiraishi, Katsuhiro Kobayashi, Toshio Namba, R. Svoboda, Masayuki Nakahata, Kunio Inoue, S. B. Kim, H. Maesaka, Shoji Yamamoto, K. Kaneyuki, A. Minamino, Mark R. Vagins, Hiroshi Sato, D. W. Liu, L. R. Sulak, M. Malek, H. Nishino, Yasunari Suzuki, T. Kato, K. S. Ganezer, W. Gajewski, Kate Scholberg, Tsuyoshi Nakaya, Takaaki Kajita, J. Yoo, C. K. Jung, Masato Shiozawa, D. Kielczewska, A. Kibayashi, Y. Gando, I. Kato, J. Kameda, Y. Obayashi, W. R. Kropp, T. Iwashita, I. Higuchi, C. Saji, Todd Haines, M. D. Messier, C. Mauger, A. Okada, H. G. Berns, T. Ishida, H. W. Sobel, K. Nitta, Kyoshi Nishijima, Shigetaka Moriyama, Shoei Nakayama, Yuichi Oyama, W. E. Keig, J. A. Goodman, Yoshitaka Itow, and Kazuoki Munakata

Subjects
Physics, Nuclear and High Energy Physics, Muon, Detector, Astrophysics (astro-ph), Flux, Astronomy, FOS: Physical sciences, Cosmic ray, Astrophysics, High Energy Physics - Phenomenology, Amplitude, High Energy Physics - Phenomenology (hep-ph), Primary (astronomy), High Energy Physics::Experiment, Super-Kamiokande, Anisotropy
Abstract

The relative sidereal variation in the arrival direction of primary cosmic ray nuclei of median energy 10 TeV was measured using downward, through-going muons detected with the Super-Kamiokande-I detector. The projection of the anisotropy map onto the right ascension axis has a first harmonic amplitude of $(6.64 \pm 0.98 {stat.} \pm 0.55 {syst.}) \times 10^{-4}$ and a phase at maximum at $(33.2^\circ \pm 8.2^\circ {stat.} \pm 5.1^\circ {syst.})$ right ascension. A sky map in equatorial coordinates indicates an excess region in the constellation of Taurus and a deficit region toward Virgo. The excess region is centered at $(\alpha_T, \delta_T) = (75^\circ \pm 7^\circ, -5^\circ \pm 9^\circ)$ with a half opening angle $\chi_T = (39 \pm 7)^\circ$; the excess flux is ($0.104 \pm 0.020$)% above the isotropic expectation. The corresponding parameters for the deficit region are $(\alpha_V, \delta_V) = (205^\circ \pm 7^\circ, 5^\circ \pm 10^\circ)$, $\chi_V = (54 \pm 7)^\circ$, and $(-0.094 \pm 0.014)$%. The data do not allow us to rule out a pure dipole form for the anisotropy (allowed at 13% confidence level); they are better described by the excess and deficit cones described above. We explored the implications under the assumption that the true anisotropy is not distorted too much by the analysis filter so that it is well-described by the observed excess and deficit cones., Comment: 18 pages, 11 figures, submitted for publication in Phys. Rev. D

Published
2005

Catalog

Books, media, physical & digital resources
See catalog results