A new near detector for the K2K long baseline neutrino experiment, the SciBar, was constructed and started data taking to study neutrino interactions. In K2K, neutrino oscillation is studied by comparing the number of neutrino interactions and energy spectrum between near and far detectors. In order to study neutrino oscillations more precisely, it is necessary to improve the measurement of neutrino spectrum and interactions below 1 GeV, where the latest K2K results suggest maximum oscillation. For that purpose, SciBar is designed to be fully active with fine segmentation. We present the design and basic performance. All detector components have been working as expected. Also presented are the measurements of charged current interactions which are used in the latest K2K oscillation analysis.
Bibliographical noteFunding Information:
Manuscript received October 20, 2004; revised August 18, 2005. This work was supported by the Ministry of Education, Culture, Sports, Science and Technology, Government of Japan, by the Japan Society for Promotion of Science, and by the Korea Research Foundation. S. Yamamoto, M. Hasegawa, K. Hayashi, K. Hiraide, J. Kubota, H. Maesaka, T. Morita, T. Nakaya, K. Nishikawa, T. Sasaki, S. Ueda, and M. Yokoyama are with the Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan. S. Andringa, X. Espinal, G. Jover-Mañas, F. Nova, A. Rodriguez, and F. Sanchez are with the Universitat Autónoma de Barcelona Institut de Fisica d’Altes Energies Edifici Cn, E-08193, Barcelona, Spain. S. Aoki and A. Suzuki are with Kobe University, Kobe, Hyogo 657-8501, Japan. S. Choi, E. J. Jeon, K. K. Joo, S. B. Kim, and E. J. Rhee are with the Department of Physics, Seoul National University, Seoul 151-742, Korea. U. Dore, P. F. Loverre, L. Ludovici, and C. Mariani are with the Universita’ di Roma “La Sapienza” and INFN, Roma I-000185, Italy. J. J. Gomez-Cadenas and A. Tornero-Lopez are with the Instituto de Fisica Corpuscular Apartadode Correos 22085 E-46071, Valencia, Spain. R. Gran, K. K. Shiraishi, and R. J. Wilkes are with the Department of Physics, University of Washington, Seattle, WA 98195-1560 USA. K. Hayashi, M. Iinuma, A. Kohara, Y. Nakanishi, S. Nawang, and T. Taka-hashi are with the Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima 739-8530, Japan. Y. Hayato, A. K. Ichikawa, T. Murakami, K. Nitta, and M. Tanaka are with the Institute of Particle and Nuclear Studies, KEK, Tsukuba, Ibaraki 305-0801, Japan. J. S. Jang, J. Y. Kim, M. J. Lee, and I. T. Lim are with the Department of Physics, Chonnam National University, Kwngju 500-757, Korea. C. K. Jung, D. Kerr, K. Kobayashi, E. Lessac-Chenin, C. McGrew, R. Terri, and L. Whitehead are with the Department of Physics and Astronomy, State University of New York, Stony Brook, NY 11794-3800 USA. I. Kato is with TRIUMF, Vancouver V6T 2A3, Canada. Yu. Kudenko and O. Mineev are with the Institute for Nuclear Research RAS, 117312 Moscow, Russia. Y. Kuno, Y. Takubo, and M. Yoshida are with the Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan. M. Y. Pac is with the Department of Physics, Dongshin University, Naju 520-714, Korea. Digital Object Identifier 10.1109/TNS.2005.862906
- Scintillation detectors