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Theta 13 Determination with Nuclear Reactors F. Dalnoki-Veress for the Double-Chooz Project

Recently there has been a lot of interest around the world in the use of nuclear reactors to measure θ13 , the last undetermined angle in the 3-neutrino mixing scenario. In this paper the motivations for θ13 measurement using short baseline nuclear reactor experiments are discussed. The features of such an experiment are described in the context of Double Chooz, which is a new project planned to start data-taking in 2008, and to reach a sensitivity of sin 2 (2θ13) <0.03. The past few decades have seen much progress in the field of neutrino physics. We now believe that active neutrinos mix in three flavours as quarks do in the quark sector, and that as a consequence the neutrinos must have mass. However, neutrinos mix with very different mixing angles from the quark sector since we know two of the mixing angles are large, whereas the mixing angle in the quark sector is exceedingly small. In the three neutrino mixing a scenario the mixing between the mass (ν i where i=1,2,3) and flavour eigenstates (ν α where alpha represents the 3 active lepton flavours) can be parameterized in terms of a unitary matrix often called the U P M N S mixing matrix (M is the Majorana phase matrix). Nevertheless, the underlying symmetry behind the structure of this matrix and its relation to the CKM matrix is entirely unknown: