Computer Science – Performance
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..haw.da001s&link_type=abstract
American Physical Society, First Joint Meeting of the Nuclear Physicists of the American and Japanese Physical Societies October
Computer Science
Performance
Scientific paper
Super-Kmaiokande (SK) is a 50,000 ton cylindrical water Cherenkov detector located 1000m underground in Gifu prefecture in Japan. The experiment has started in 1996 aiming to study atmospheric, solar and supernova neutrinos and to search for proton decay in order to test grand unified theories. The purpose of the solar neutrino study in SK is to find a definitive evidence of solar neutrino oscillations. More than four years of the data acquisition time, SK has provided very precise measurement of the flux and the spectrum. The spectrum is consistent with no distortion and the night flux is slightly higher than the day flux, but it is not significant. However those precise determination of the flux has provided important information on the neutrino mixing angles. The MSW small mixing angle solutions (SMA) and Vacuum Oscillation (Just-So) solutions require the spectrum to be distorted. Therefore the non-observation of the distortion places a strong constraint on those solutions. At about 95% C.L. the SMA and Just-So solutions are disfavored by the spectrum shape and the day-night flux differences without any additional information of the absolute flux of solar neutrinos. The flux independent (or solar model independent) measurement of SK alone strongly indicates large mixings. In conjunction with the SNO CC data, the solar neutrino oscillations are clearly demonstrated independent of the solar model calculations, and it is now necessary to know the true oscillation parameters, especially for the mass difference. If the MSW large mixing angle solutions (LMA) is the correct solution, we expect a small, but positive day/night asymmetry. Therefore we are now improving a detector performance to reduce systematics and improve the sensitivities. If LOW or Quasi-Vacuum is the correct solution, the smoking gun evidence can be obtained by the information from pp and 7Be neutrinos. There are several such efforts. Some of those experiments can also be applicable to search for dark matter and neutrino-less double beta decay.
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