Faculty Profiles - KOSHIO Yusuke

Papers - KOSHIO Yusuke

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Study of neutron background in the atmospheric neutrino sample in Kamiokande Reviewed

Y Fukuda, T Hayakawa, K Inoue, K Ishihara, H Ishino, S Joukou, T Kajita, S Kasuga, Y Koshio, T Kumita, K Matsumoto, M Nakahata, K Nakamura, K Okumura, A Sakai, M Shiozawa, J Suzuki, Y Suzuki, T Tomoeda, Y Totsuka, KS Hirata, K Kihara, Y Oyama, M Koshiba, T Horiuchi, K Nishijima, K Fujita, S Hatakeyama, M Koga, T Maruyama, A Suzuki, M Mori, T Suda, AT Suzuki, T Ishizuka, K Miyano, H Okazawa, T Hara, Y Nagashima, M Takita, T Yamaguchi, Y Hayato, K Kaneyuki, T Suzuki, Y Takeuchi, T Tanimori, S Tasaka, E Ichihara, S Miyamoto, K Nishikawa

PHYSICS LETTERS B 388 ( 2 ) 397 - 401 1996.11

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

Neutron background in the atmospheric neutrino sample was studied based on the vertex position distribution of the fully contained pi(0) events. No evidence for the background contamination was observed. The neutron contamination in the sub-GeV e-like sample was less than 1.2% at 90% C.L.

DOI： 10.1016/S0370-2693(96)01264-6

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Solar neutrino data covering solar cycle 22 Reviewed

Y Fukuda, T Hayakawa, K Inoue, K Ishihara, H Ishino, S Joukou, T Kajita, S Kasuga, Y Koshio, T Kumita, K Matsumoto, M Nakahata, K Nakamura, K Okumura, A Sakai, M Shiozawa, J Suzuki, Y Suzuki, T Tomoeda, Y Totsuka, KS Hirata, K Kihara, Y Oyama, M Koshiba, K Nishijima, T Horiuchi, K Fujita, S Hatakeyama, M Koga, T Maruyama, A Suzuki, M Mori, T Kajimura, T Suda, AT Suzuki, T Ishizuka, K Miyano, H Okazawa, T Hara, Y Nagashima, M Takita, T Yamaguchi, Y Hayato, K Kaneyuki, T Suzuki, Y Takeuchi, T Tanimori, S Tasaka, E Ichihara, S Miyamoto, K Nishikawa

PHYSICAL REVIEW LETTERS 77 ( 9 ) 1683 - 1686 1996.8

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

Results from 1036 days of solar neutrino data accumulated in the upgraded Kamiokande detector (Kamiokande III) are presented. The B-8 solar neutrino flux observed in Kamiokande III is 2.82(-0.24)(+0.25)(stat) +/- 0.27(syst) x 10(6) cm(-2) s(-1); the combined flux from Kamiokande II and III (2079 days in total) is 2.80 +/- 0.19 (stat) +/- 0.33 (syst) x 10(6) cm(-2) s(-1), which is 49% to 64% of the standard solar models. These combined data from January 1987 to February 1995, covering an entire period of solar cycle 22, enabled us to study a correlation between the neutrino flux and the solar activity in detail: no strong correlation of the solar neutrino flux with the sunspot numbers was found within experimental errors. The result on a search for the daytime and nighttime flux difference is also reported.

DOI： 10.1103/PhysRevLett.77.1683

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A study on the e/mu identification capability of a water Cerenkov detector and the atmospheric neutrino problem Reviewed

S Kasuga, T Hayakawa, S Joukou, T Kajita, Y Koshio, T Kumita, K Matsumoto, M Nakahata, A Sakai, M Shiozawa, Y Suzuki, Y Totsuka, KS Hirata, K Kihara, Y Oyama, O Sasaki, AT Suzuki, T Ishizuka, K Miyano, H Okazawa, K Nishikawa, K Fujita, M Koga, A Suzuki

PHYSICS LETTERS B 374 ( 1-3 ) 238 - 242 1996.5

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

We carried out an experimental test of various characteristics of a water Cerenkov detector, especially the particle identification capability, using the 12-GeV proton synchrotron at KEK, Japan. The detector characteristics so far studied are well reproduced by the Monte Carlo simulation. Especially it is able to identify electrons and muons with mis-identification probabilities less than a few percent in the momentum range of 250-1000 MeV/c except the particle positions in the extreme edge of the detector volume. Based on the present results, the deficiency of mu-neutrinos in the atmospheric neutrinos is not an artifact caused by some peculiar detector characteristics.

DOI： 10.1016/0370-2693(96)00138-4

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SEARCH FOR LOW-ENERGY NEUTRINOS FROM GALACTIC GAMMA-RAY SOURCES

Y FUKUDA, T HAYAKAWA, K INOUE, T ISHIDA, T KAJITA, Y KOSHIO, M NAKAHATA, K NAKAMURA, A SAKAI, M SHIOZAWA, J SUZUKI, Y SUZUKI, Y TOTSUKA, M MORI, KS HIRATA, K KIHARA, Y OYAMA, A SUZUKI, M YAMADA, M KOSHIBA, K NISHIJIMA, T KAJIMURA, T SUDA, AT SUZUKI, H TAKEI, K KOGA, K MIYANO, H MIYATA, T HARA, N KISHI, Y NAGASHIMA, M TAKITA, A YOSHIMOTO, K KANEYUKI, Y TAKEUCHI, T TANIMORI, S TASAKA, K NISHIKAWA, EW BEIER, ED FRANK, W FRATI, SB KIM, AK MANN, FM NEWCOMER, R VANBERG, W ZHANG

ASTROPHYSICAL JOURNAL 435 ( 1 ) 225 - 229 1994.11

Language：English Publishing type：Research paper (scientific journal) Publisher：IOP PUBLISHING LTD

Data from the Kamiokande detector are used to set upper limits on fluxes of low-energy neutrinos from possible nearby sources within or near our Galaxy. The search was conducted for 1557 live detector days from 1987 January to 1993 February.

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ATMOSPHERIC NU(MU) NU(E) RATIO IN THE MULTI-GEV ENERGY-RANGE Reviewed

Y FUKUDA, T HAYAKAWA, K INOUE, T ISHIDA, S JOUKOU, T KAJITA, S KASUGA, Y KOSHIO, T KUMITA, K MATSUMOTO, M NAKAHATA, K NAKAMURA, A SAKAI, M SHIOZAWA, J SUZUKI, Y SUZUKI, Y TOTSUKA, KS HIRATA, K KIHARA, M MORI, Y OYAMA, A SUZUKI, M YAMADA, M KOSHIBA, K NISHIJIMA, T KAJIMURA, T SUDA, AT SUZUKI, T ISHIZUKA, M KOGA, K MIYANO, H MIYATA, H OKAZAWA, H TAKEI, T HARA, N KISHI, Y NAGASHIMA, M TAKITA, A YOSHIMOTO, Y HAYATO, K KANEYUKI, Y TAKEUCHI, T TANIMORI, S TASAKA, K NISHIKAWA, EW BEIER, ED FRANK, W FRATI, SB KIM, AK MANN, FM NEWCOMER, R VANBERG, W ZHANG

PHYSICS LETTERS B 335 ( 2 ) 237 - 245 1994.9

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

Data from the Kamiokande detector were used to study the atmospheric (nu(mu) + nu(mu)BAR)/(nu(e) + nu(e)BAR) ratio in the multi-GeV energy range. The observed ratio of mu-like to e-like events relative to the calculated ratio, (mu/e)data/(mu/e)MC = 0.57(+0.08/-0.07) +/- 0.07, suggests that the atmospheric (nu(mu) + nu(mu)BAR)/(nu(e) + nu(e)BAR) ratio is smaller than expected for these neutrino energies. Also studied was the zenith-angle dependence of the above ratio. Results of an analysis of neutrino oscillations are presented.

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SEARCH FOR NEUTRALINO DARK-MATTER HEAVIER THAN THE W-BOSON AT KAMIOKANDE

M MORI, MM NOJIRI, KS HIRATA, K KIHARA, Y OYAMA, A SUZUKI, K TAKAHASHI, M YAMADA, H TAKEI, M KOGA, K MIYANO, H MIYATA, Y FUKUDA, T HAYAKAWA, K INOUE, T ISHIDA, T KAJITA, Y KOSHIO, M NAKAHATA, K NAKAMURA, A SAKAI, N SATO, M SHIOZAWA, J SUZUKI, Y SUZUKI, Y TOTSUKA, M KOSHIBA, K NISHIJIMA, T KAJIMURA, T SUDA, AT SUZUKI, T HARA, Y NAGASHIMA, M TAKITA, H YOKOYAMA, A YOSHIMOTO, K KANEYUKI, Y TAKEUCHI, T TANIMORI, S TASAKA, K NISHIKAWA

PHYSICAL REVIEW D 48 ( 12 ) 5505 - 5518 1993.12

Language：English Publishing type：Research paper (scientific journal) Publisher：AMERICAN PHYSICAL SOC

We have searched for possible high-energy neutrino signals which are expected from massive dark matter captured by the Earth and the Sun by making use of upward-going muon samples collected during 7 years of operation of the Kamiokande detector. No excess of events was found from the Earth or the Sun, thus giving an excluded range of parameters for the neutralino dark matter which is hypothesized to constitute the halo of the Galaxy. The upper bounds extend to a mass range of up to similar to 1 TeV, which was never analyzed in previous indirect searches.

DOI： 10.1103/PhysRevD.48.5505

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