Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2009-02-23
Physics
High Energy Physics
High Energy Physics - Experiment
8 pages, 5 figures
Scientific paper
Large liquid scintillation detectors have been generally dedicated to low energy neutrino measurements, in the MeV energy region (as for example, KamLAND and Borexino). Herein we describe the potential employment of large detectors (>1 kiloton) for studies of higher energy neutrinos interactions, from the cosmic rays and as a long baseline neutrino detector. Generally when people have considered large new instruments such as Hanohano and LENA, they have abandoned the possibility of doing useful measurements with higher energy neutrino interactions since these produce enough light to illuminate every photomultiplier tube, and the scintillation light is isotropic. Here we take into account Fermat's principle, which tells us that indeed the first light to reach the PMTs will be on or near the lightcone, the "Fermat surface", and that directional track information is available. Moreover we have realized that particle type distinction is possible (quasi-elastic muons from electrons). In fact the resolution from a detector of comparable size to SuperKamiokande, may be better in both angle, energy and possibly particle type. This realization opens the doors to a number of applications. Moreover, this capability can be demonstrated with the use of (future) KamLAND detected events in the new long baseline neutrino beam from the Jaeri accelerator in Japan, due to start operations this year. Some of the most attractive possibilities for the future may be in using Hanohano as a movable long baseline detector in this same beam, the employment of LENA in Europe in future long baseline neutrino beams from CERN, and in the DUSEL underground laboratory at Homestake.
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