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Study of the atmospheric neutrino flux in the multi-GeV energy range

  • 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, E. Kearns, S. B. Kim, 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, Z. Conner, J. A. Goodman, G. W. Sullivan, M. Mori, 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, 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, K. Young
  • The University of Tokyo
  • Louisiana State University
  • Boston University
  • Seoul National University
  • Brookhaven National Laboratory
  • University of California at Irvine
  • National Aeronautics and Space Administration
  • California State University Dominguez Hills
  • George Mason University
  • Gifu University
  • University of Hawai'i at Mānoa
  • High Energy Accelerator Research Organization, Tsukuba
  • High Energy Accelerator Research Organization, Institute of Particle and Nuclear Physics
  • Stony Brook University
  • Kobe University
  • Los Alamos National Laboratory
  • University of Maryland, College Park
  • The University of Chicago
  • Miyagi University of Education
  • Niigata University
  • Shizuoka University
  • The University of Osaka
  • Tohoku University
  • Tokai University
  • Institute of Science Tokyo
  • University of Warsaw
  • University of Washington

Research output: Contribution to journalArticlepeer-review

397 Scopus citations

Abstract

The flavor ratio of the atmospheric neutrino flux and its zenith angle dependence have been studied in the multi-GeV energy range using an exposure of 25.5 kiloton-years of the Super-Kamiokande detector. By comparing the data to a detailed Monte Carlo simulation, the ratio (μ/e)DATA/(μ/e)MC was measured to be 0.66 ± 0.06(stat.) ± 0.08(sys.). In addition, a strong distortion in the shape of the μ-like event zenith angle distribution was observed. The ratio of the number of upward to downward μ-like events was found to be 0.52+0.070.06(stat.) ± 0.01(sys.), with an expected value of 0.98 ± 0.03(stat.) ± 0.02(sys.), while the same ratio for the e-like events was consistent with unity.

Original languageEnglish
Pages (from-to)33-41
Number of pages9
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume436
Issue number1-2
DOIs
StatePublished - Sep 17 1998

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