Observation of the east-west anisotropy of the atmospheric neutrino flux

T. Futagami, Y. Fukuda, T. Hayakawa, K. Inoue, K. Ishihara, Hirokazu Ishino, Y. Itow, T. Kajita, J. Kameda, S. Kasuga, K. Kobayashi, Y. Kobayashi, Yusuke Koshio, M. Miura, M. Nakahata, S. Nakayama, Y. Obayashi, A. Okada, K. Okumura, N. Sakurai & 102 others M. Shiozawa, Y. Suzuki, H. Takeuchi, Y. Takeuchi, Y. Totsuka, S. Yamada, M. Earl, A. Habig, 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, L. R. Price, M. 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, V. J. Stenger, D. Takemori, T. Ishii, J. Kanzaki, T. Kobayashi, K. Nakamura, K. Nishikawa, Y. Oyama, A. Sakai, Makoto Sakuda, O. Sasaki, S. Echigo, M. Kohama, A. T. Suzuki, T. J. Haines, E. Blaufuss, B. K. Kim, R. Sanford, R. Svoboda, M. L. Chen, J. A. Goodman, G. W. Sullivan, J. Hill, C. K. Jung, K. Martens, C. Mauger, C. McGrew, E. Sharkey, B. Viren, C. Yanagisawa, W. Doki, M. Kirisawa, S. Inaba, K. Miyano, H. Okazawa, C. Saji, M. Takahashi, M. Takahata, K. Higuchi, Y. Nagashima, M. Takita, T. Yamaguchi, M. Yoshida, S. B. Kim, M. Etoh, A. Hasegawa, T. Hasegawa, S. Hatakeyama, T. Iwamoto, M. Koga, T. Maruyama, H. Ogawa, J. Shirai, A. Suzuki, F. Tsushima, M. Koshiba, Y. Hatakeyama, M. Koike, M. Nemoto, K. Nishijima, H. Fujiyasu, Y. Hayato, Y. Kanaya, K. Kaneyuki, Y. Watanabe, D. Kielczewska, J. S. George, A. L. Stachyra, L. L. Wai, R. J. Wilkes, K. K. Young

Research output: Contribution to journalArticle

82 Citations (Scopus)

Abstract

The east-west anisotropy, caused by the deflection of primary cosmic rays in the Earth's magnetic field, is observed for the first time in the flux of atmospheric neutrinos. Using a 45 kt yr exposure of the Super-Kamiokande detector, 552 e-like and 633 μ-like horizontally going events are selected in the momentum range between 400 and 3000 MeV/c. The azimuthal distributions of e-like and μ-like events agree with the expectation from atmospheric neutrino flux calculations, verifying that the flux of atmospheric neutrinos in the GeV energy range is reasonably well modeled by calculations that account for the geomagnetic field.

Original languageEnglish
Pages (from-to)5194-5197
Number of pages4
JournalPhysical Review Letters
Volume82
Issue number26 I
Publication statusPublished - Jun 28 1999
Externally publishedYes

Fingerprint

neutrinos
anisotropy
primary cosmic rays
geomagnetism
deflection
momentum
detectors
magnetic fields
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Futagami, T., Fukuda, Y., Hayakawa, T., Inoue, K., Ishihara, K., Ishino, H., ... Young, K. K. (1999). Observation of the east-west anisotropy of the atmospheric neutrino flux. Physical Review Letters, 82(26 I), 5194-5197.

Observation of the east-west anisotropy of the atmospheric neutrino flux. / Futagami, T.; Fukuda, Y.; Hayakawa, T.; Inoue, K.; Ishihara, K.; Ishino, Hirokazu; Itow, Y.; Kajita, T.; Kameda, J.; Kasuga, S.; Kobayashi, K.; Kobayashi, Y.; Koshio, Yusuke; Miura, M.; Nakahata, M.; Nakayama, S.; Obayashi, Y.; Okada, A.; Okumura, K.; Sakurai, N.; Shiozawa, M.; Suzuki, Y.; Takeuchi, H.; Takeuchi, Y.; Totsuka, Y.; Yamada, S.; Earl, M.; Habig, A.; Kearns, E.; Messier, M. D.; Scholberg, K.; Stone, J. L.; Sulak, L. R.; Walter, C. W.; Goldhaber, M.; Barszczak, T.; Casper, D.; Gajewski, W.; Kropp, W. R.; Mine, S.; Price, L. R.; Smy, M.; Sobel, H. W.; Vagins, M. R.; Ganezer, K. S.; Keig, W. E.; Ellsworth, R. W.; Tasaka, S.; Kibayashi, A.; Learned, J. G.; Matsuno, S.; Stenger, V. J.; Takemori, D.; Ishii, T.; Kanzaki, J.; Kobayashi, T.; Nakamura, K.; Nishikawa, K.; Oyama, Y.; Sakai, A.; Sakuda, Makoto; Sasaki, O.; Echigo, S.; Kohama, M.; Suzuki, A. T.; Haines, T. J.; Blaufuss, E.; Kim, B. K.; Sanford, R.; Svoboda, R.; Chen, M. L.; Goodman, J. A.; Sullivan, G. W.; Hill, J.; Jung, C. K.; Martens, K.; Mauger, C.; McGrew, C.; Sharkey, E.; Viren, B.; Yanagisawa, C.; Doki, W.; Kirisawa, M.; Inaba, S.; Miyano, K.; Okazawa, H.; Saji, C.; Takahashi, M.; Takahata, M.; Higuchi, K.; Nagashima, Y.; Takita, M.; Yamaguchi, T.; Yoshida, M.; Kim, S. B.; Etoh, M.; Hasegawa, A.; Hasegawa, T.; Hatakeyama, S.; Iwamoto, T.; Koga, M.; Maruyama, T.; Ogawa, H.; Shirai, J.; Suzuki, A.; Tsushima, F.; Koshiba, M.; Hatakeyama, Y.; Koike, M.; Nemoto, M.; Nishijima, K.; Fujiyasu, H.; Hayato, Y.; Kanaya, Y.; Kaneyuki, K.; Watanabe, Y.; Kielczewska, D.; George, J. S.; Stachyra, A. L.; Wai, L. L.; Wilkes, R. J.; Young, K. K.

In: Physical Review Letters, Vol. 82, No. 26 I, 28.06.1999, p. 5194-5197.

Research output: Contribution to journalArticle

Futagami, T, Fukuda, Y, Hayakawa, T, Inoue, K, Ishihara, K, Ishino, H, Itow, Y, Kajita, T, Kameda, J, Kasuga, S, Kobayashi, K, Kobayashi, Y, Koshio, Y, Miura, M, Nakahata, M, Nakayama, S, Obayashi, Y, Okada, A, Okumura, K, Sakurai, N, Shiozawa, M, Suzuki, Y, Takeuchi, H, Takeuchi, Y, 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, Stenger, VJ, Takemori, D, Ishii, T, Kanzaki, J, Kobayashi, T, Nakamura, K, Nishikawa, K, Oyama, Y, Sakai, A, Sakuda, M, Sasaki, O, Echigo, S, Kohama, M, Suzuki, AT, Haines, TJ, Blaufuss, E, Kim, BK, Sanford, R, Svoboda, R, Chen, ML, Goodman, JA, Sullivan, GW, Hill, J, Jung, CK, Martens, K, Mauger, C, McGrew, C, Sharkey, E, Viren, B, Yanagisawa, C, Doki, W, Kirisawa, M, Inaba, S, Miyano, K, Okazawa, H, Saji, C, Takahashi, M, Takahata, M, Higuchi, K, Nagashima, Y, Takita, M, Yamaguchi, T, Yoshida, M, Kim, SB, Etoh, M, Hasegawa, A, Hasegawa, T, Hatakeyama, S, Iwamoto, T, Koga, M, Maruyama, T, Ogawa, H, Shirai, J, Suzuki, A, Tsushima, F, Koshiba, M, Hatakeyama, Y, Koike, M, Nemoto, M, Nishijima, K, Fujiyasu, H, Hayato, Y, Kanaya, Y, Kaneyuki, K, Watanabe, Y, Kielczewska, D, George, JS, Stachyra, AL, Wai, LL, Wilkes, RJ & Young, KK 1999, 'Observation of the east-west anisotropy of the atmospheric neutrino flux', Physical Review Letters, vol. 82, no. 26 I, pp. 5194-5197.
Futagami T, Fukuda Y, Hayakawa T, Inoue K, Ishihara K, Ishino H et al. Observation of the east-west anisotropy of the atmospheric neutrino flux. Physical Review Letters. 1999 Jun 28;82(26 I):5194-5197.
Futagami, T. ; Fukuda, Y. ; Hayakawa, T. ; Inoue, K. ; Ishihara, K. ; Ishino, Hirokazu ; Itow, Y. ; Kajita, T. ; Kameda, J. ; Kasuga, S. ; Kobayashi, K. ; Kobayashi, Y. ; Koshio, Yusuke ; Miura, M. ; Nakahata, M. ; Nakayama, S. ; Obayashi, Y. ; Okada, A. ; Okumura, K. ; Sakurai, N. ; Shiozawa, M. ; Suzuki, Y. ; Takeuchi, H. ; Takeuchi, Y. ; Totsuka, Y. ; Yamada, S. ; Earl, M. ; Habig, A. ; Kearns, E. ; Messier, M. D. ; Scholberg, K. ; Stone, J. L. ; Sulak, L. R. ; Walter, C. W. ; Goldhaber, M. ; Barszczak, T. ; Casper, D. ; Gajewski, W. ; Kropp, W. R. ; Mine, S. ; Price, L. R. ; Smy, M. ; Sobel, H. W. ; Vagins, M. R. ; Ganezer, K. S. ; Keig, W. E. ; Ellsworth, R. W. ; Tasaka, S. ; Kibayashi, A. ; Learned, J. G. ; Matsuno, S. ; Stenger, V. J. ; Takemori, D. ; Ishii, T. ; Kanzaki, J. ; Kobayashi, T. ; Nakamura, K. ; Nishikawa, K. ; Oyama, Y. ; Sakai, A. ; Sakuda, Makoto ; Sasaki, O. ; Echigo, S. ; Kohama, M. ; Suzuki, A. T. ; Haines, T. J. ; Blaufuss, E. ; Kim, B. K. ; Sanford, R. ; Svoboda, R. ; Chen, M. L. ; Goodman, J. A. ; Sullivan, G. W. ; Hill, J. ; Jung, C. K. ; Martens, K. ; Mauger, C. ; McGrew, C. ; Sharkey, E. ; Viren, B. ; Yanagisawa, C. ; Doki, W. ; Kirisawa, M. ; Inaba, S. ; Miyano, K. ; Okazawa, H. ; Saji, C. ; Takahashi, M. ; Takahata, M. ; Higuchi, K. ; Nagashima, Y. ; Takita, M. ; Yamaguchi, T. ; Yoshida, M. ; Kim, S. B. ; Etoh, M. ; Hasegawa, A. ; Hasegawa, T. ; Hatakeyama, S. ; Iwamoto, T. ; Koga, M. ; Maruyama, T. ; Ogawa, H. ; Shirai, J. ; Suzuki, A. ; Tsushima, F. ; Koshiba, M. ; Hatakeyama, Y. ; Koike, M. ; Nemoto, M. ; Nishijima, K. ; Fujiyasu, H. ; Hayato, Y. ; Kanaya, Y. ; Kaneyuki, K. ; Watanabe, Y. ; Kielczewska, D. ; George, J. S. ; Stachyra, A. L. ; Wai, L. L. ; Wilkes, R. J. ; Young, K. K. / Observation of the east-west anisotropy of the atmospheric neutrino flux. In: Physical Review Letters. 1999 ; Vol. 82, No. 26 I. pp. 5194-5197.
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T1 - Observation of the east-west anisotropy of the atmospheric neutrino flux

AU - Futagami, T.

AU - Fukuda, Y.

AU - Hayakawa, T.

AU - Inoue, K.

AU - Ishihara, K.

AU - Ishino, Hirokazu

AU - Itow, Y.

AU - Kajita, T.

AU - Kameda, J.

AU - Kasuga, S.

AU - Kobayashi, K.

AU - Kobayashi, Y.

AU - Koshio, Yusuke

AU - Miura, M.

AU - Nakahata, M.

AU - Nakayama, S.

AU - Obayashi, Y.

AU - Okada, A.

AU - Okumura, K.

AU - Sakurai, N.

AU - Shiozawa, M.

AU - Suzuki, Y.

AU - Takeuchi, H.

AU - Takeuchi, Y.

AU - Totsuka, Y.

AU - Yamada, S.

AU - Earl, M.

AU - Habig, A.

AU - Kearns, E.

AU - Messier, M. D.

AU - Scholberg, K.

AU - Stone, J. L.

AU - Sulak, L. R.

AU - Walter, C. W.

AU - Goldhaber, M.

AU - Barszczak, T.

AU - Casper, D.

AU - Gajewski, W.

AU - Kropp, W. R.

AU - Mine, S.

AU - Price, L. R.

AU - Smy, M.

AU - Sobel, H. W.

AU - Vagins, M. R.

AU - Ganezer, K. S.

AU - Keig, W. E.

AU - Ellsworth, R. W.

AU - Tasaka, S.

AU - Kibayashi, A.

AU - Learned, J. G.

AU - Matsuno, S.

AU - Stenger, V. J.

AU - Takemori, D.

AU - Ishii, T.

AU - Kanzaki, J.

AU - Kobayashi, T.

AU - Nakamura, K.

AU - Nishikawa, K.

AU - Oyama, Y.

AU - Sakai, A.

AU - Sakuda, Makoto

AU - Sasaki, O.

AU - Echigo, S.

AU - Kohama, M.

AU - Suzuki, A. T.

AU - Haines, T. J.

AU - Blaufuss, E.

AU - Kim, B. K.

AU - Sanford, R.

AU - Svoboda, R.

AU - Chen, M. L.

AU - Goodman, J. A.

AU - Sullivan, G. W.

AU - Hill, J.

AU - Jung, C. K.

AU - Martens, K.

AU - Mauger, C.

AU - McGrew, C.

AU - Sharkey, E.

AU - Viren, B.

AU - Yanagisawa, C.

AU - Doki, W.

AU - Kirisawa, M.

AU - Inaba, S.

AU - Miyano, K.

AU - Okazawa, H.

AU - Saji, C.

AU - Takahashi, M.

AU - Takahata, M.

AU - Higuchi, K.

AU - Nagashima, Y.

AU - Takita, M.

AU - Yamaguchi, T.

AU - Yoshida, M.

AU - Kim, S. B.

AU - Etoh, M.

AU - Hasegawa, A.

AU - Hasegawa, T.

AU - Hatakeyama, S.

AU - Iwamoto, T.

AU - Koga, M.

AU - Maruyama, T.

AU - Ogawa, H.

AU - Shirai, J.

AU - Suzuki, A.

AU - Tsushima, F.

AU - Koshiba, M.

AU - Hatakeyama, Y.

AU - Koike, M.

AU - Nemoto, M.

AU - Nishijima, K.

AU - Fujiyasu, H.

AU - Hayato, Y.

AU - Kanaya, Y.

AU - Kaneyuki, K.

AU - Watanabe, Y.

AU - Kielczewska, D.

AU - George, J. S.

AU - Stachyra, A. L.

AU - Wai, L. L.

AU - Wilkes, R. J.

AU - Young, K. K.

PY - 1999/6/28

Y1 - 1999/6/28

N2 - The east-west anisotropy, caused by the deflection of primary cosmic rays in the Earth's magnetic field, is observed for the first time in the flux of atmospheric neutrinos. Using a 45 kt yr exposure of the Super-Kamiokande detector, 552 e-like and 633 μ-like horizontally going events are selected in the momentum range between 400 and 3000 MeV/c. The azimuthal distributions of e-like and μ-like events agree with the expectation from atmospheric neutrino flux calculations, verifying that the flux of atmospheric neutrinos in the GeV energy range is reasonably well modeled by calculations that account for the geomagnetic field.

AB - The east-west anisotropy, caused by the deflection of primary cosmic rays in the Earth's magnetic field, is observed for the first time in the flux of atmospheric neutrinos. Using a 45 kt yr exposure of the Super-Kamiokande detector, 552 e-like and 633 μ-like horizontally going events are selected in the momentum range between 400 and 3000 MeV/c. The azimuthal distributions of e-like and μ-like events agree with the expectation from atmospheric neutrino flux calculations, verifying that the flux of atmospheric neutrinos in the GeV energy range is reasonably well modeled by calculations that account for the geomagnetic field.

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VL - 82

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JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

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