ar X iv : h ep - e x / 03 03 04 5 v 1 2 9 M ar 2 00 3 Neutrino properties studied with a triton source using large TPC detectors
نویسندگان
چکیده
The purpose of the present paper is to study the neutrino properties as they may appear in the low energy neutrinos emitted in triton decay: 3 1 H → 3 2 He + e − + ˜ νe with maximum neutrino energy of 18.6 KeV. The technical challenges to this end can be summarized as building a very large TPC capable of detecting low energy recoils, down to a few 100 eV, within the required low background constraints. More specifically We propose the development of a spherical gaseous TPC of about 10-m in radius and a 200 Mcurie triton source in the center of curvature. One can list a number of exciting studies, concerning fundamental physics issues, that could be made using a large volume TPC and low energy antineutrinos: 1) The oscillation length involving the small angle δ = sin 2θ13 in the νe disappearance experiment is comparable to the length of the detector. Measuring the counting rate of neutrino-electron elastic scattering as function of the distance of the source will give a precise and unambiguous measurement of the oscillation parameters free of systematic errors. In fact first estimations show that a sensitivity of a few percent for the measurement of the above angle. 2) The low energy detection threshold offers a unique sensitivity for the neutrino magnetic moment which is about two orders of magnitude beyond the current experimental limit of 10 −10 µB. 3) Scattering at such low neutrino energies has never been studied and any departure from the expected behavior may be an indication of new physics beyond the standard model. We present a summary of various theoretical studies and possible measurements.
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