M Aoki

Publications (2)0 Total impact

• Source

  Available from: Fumihiko Suekane

  Article: On-site underground background measurements for the KASKA reactor-neutrino experiment

  H Furuta, K Sakuma, M Aoki, Y Fukuda, Y. Funaki, T Hara, T. Haruna, N Ishihara, M Katsumata, T Kawasaki, [......], T Nakagawa, N Nakajima, K Nitta, K Sakai, Y Sakamoto, F Suekane, T. Sumiyoshi, H Tabata, N Tamura, Y Tsuchiya
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  ABSTRACT: On-site underground background measurements were performed for the planned reactor-neutrino oscillation experiment KASKA at Kashiwazaki-Kariwa nuclear power station in Niigata, Japan. A small-diameter boring hole was excavated down to 70m underground level, and a detector unit for $\gamma$-ray and cosmic-muon measurements was placed at various depths to take data. The data were analyzed to obtain abundance of natural radioactive elements in the surrounding soil and rates of cosmic muons that penetrate the overburden. The results will be reflected in the design of the KASKA experiment.
  08/2006;
• Source

  Available from: Fumihiko Suekane

  Article: Letter of Intent for KASKA: High Accuracy Neutrino Oscillation Measurements with anti-nu_es from Kashiwazaki-Kariwa Nuclear Power Station

  M Aoki, K Akiyama, Y Fukuda, A Fukui, Y. Funaki, H Furuta, T Hara, T. Haruna, N Ishihara, T. Iwabuchi, [......], M Sasaki, F Suekane, H Sugiyama, T. Sumiyoshi, H Tabata, N Tamura, M Tanimoto, Y Tsuchiya, R Watanabe, O. Yasuda
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  ABSTRACT: One of the current most-demanded experiments in neutrino physics is to measure the last mixing angle theta_13. KASKA is an experiment to detect new type of reactor neutrino oscillation and to measure sin^2 2theta_13 accurately using the world's most powerful nuclear reactor complex; Kashiwazaki-Kariwa nuclear power station. KASKA utilizes near and far detectors of identical structure at nearly optimized baselines and underground depths to cancel most of the systematics and reduce backgrounds. The expected sensitivity is sin^2 2theta_13~0.015, which is 10 times better sensitivity than the current upper limit measured by CHOOZ reactor experiment. Extension of KASKA project has potential to accurately measure other anti-nu_e oscillation parameters. Intense and precisely known neutrino flux measured by the KASKA-theta_13 phase can be used to pin down sin^2 2theta_12 at a baseline ~50km and to measure Dm^2_13 for the first time at a baseline ~5km. This Letter of Intent describes physics motivation, detector system and expected performance of the KASKA experiment.
  08/2006;