Abstract
"Neutrino physics is largely an art of learning a great deal by observing nothing" (Haim Harari, 1988) was our general understanding of the field for the ~25 years previous. A new neutrino era was abruptly brought from outer space by a burst of SN1987A neutrinos. The detection of neutrinos from SN1987A gave a new impetus to neutrino research. As we know, new discoveries of neutrinos have since been made. Neutrinos were no longer mysterious, but attained particle citizenship.Giant liquid argon charge imaging experiments have the prospect of opening the door to the second new era in neutrino physics. The coming era would provoke not evolution, but revolution in particle physics. However, paving the way for the new era requires not evolutionary, but revolutionary detector developments. I hope this workshop will be conducive to reaping a rich harvest from its activities.In 1993, Professor Carlo Rubbia presented "The Renaissance of Experimental Neutrino Physics" in which he discussed various possibilities of shooting neutrino beams from CERN towards Gran Sasso, Super-Kamiokande at Kamioka and DUMAND in Hawaii. Now KEK hopes to shoot neutrino beams from J-PARC to Kamioka, Okinoshima, Korea and Gran Sasso. Atsuto Suzuki Director General, KEK J-PARC has moved into a new phase of operation. The commissioning of the accelerator complex and experiment facilities has begun, and it is urgent to attain initial design performance as soon as possible. For the immediate future, KEK has a 5 year plan. The plan includes the upgrade of the J-PARC accelerator to a multi-Mega-Watt facility, and detector R&Ds to form the basis for a next step in the neutrino experiment. One of the main issues of the future neutrino experiment will be the search for CP violation in neutrino oscillation, which demands much more precision than studying neutrino oscillation or non-zero theta13. This naturally requires a very massive detector with higher precision than presently available technologies. In addition, such a detector will also be an excellent detector for the further search for proton decay.The sensitivity of the various methods of extracting CP violation should be carefully evaluated. At the 4th International Workshop on Nuclear and Particle Phyics at J-PARC (NP08) in March 2008, the J-PARC MR power upgrade and the future neutrino experiment were discussed.At the workshop, a comparison of first and second maximum in electron neutrino appearance in muon neutrino beam was discussed. This method is free from systematic errors due to ambiguities of neutrino and anti-neutrino cross sections. On the other hand, this method requires a very massive detector with energy reconstruction capability for a wide range of neutrino energy. Beside the statistical precision, which requires a high power proton accelerator, there are many strict requirements on the detector. Most of the requirements are common to a detector for neutrino physics and to the search for proton decay.We need new ways of looking for new phenomena at a level far beyond on-going experiments. Future experiments should be designed based on new detector technology, improved accelerator technology and the results of present on-going experiments.We are looking forward seeing the outcome. Koichiro Nishikawa Director, IPNS KEK
Published Version
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