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Letter of Intent for Double-CHOOZ: a Search for the Mixing Angle Theta13
F. Ardellier, I. Barabanov, J. C. Barriere, M. Bauer, L. Bezrukov, C. Buck, C. Cattadori, B. Courty1, 2, M. Cribier2, 3, F. Dalnoki-Veress, N. Danilov, H. de Kerret1, 2, A. Di Vacri, A. Etenko, M. Fallot4, Ch. Grieb, M. Goeger, A. Guertin4, T. Kirchner4, Y. S. Krylov, D. Kryn1, 2, C. Hagner, W. Hampel, F. X. Hartmann, P. Huber, J. Jochum, T. Lachenmaier, T. Lasserre2, 3, 5, Ch. Lendvai, M. Lindner, F. Marie, J. Martino4, G. Mention, A. Milsztajn, J. P. Meyer, D. Motta, L. Oberauer, M. Obolensky1, 2, L. Pandola, W. Potzel, S. Schoenert, U. Schwan, T. Schwetz, S. Scholl, L. Scola, M. Skorokhvatov, S. Sukhotin1, A. Letourneau, D. Vignaud1, 2, F. Von Feilitzsch, W. Winter, E. Yanovich
For the Double-CHOOZ collaboration(s)

Tremendous progress has been achieved in neutrino oscillation physics during the last few years. However, the smallness of the $\t13$ neutrino mixing angle still remains enigmatic. The current best constraint comes from the CHOOZ reactor neutrino experiment $\s2t13 < 0.2$ (at 90% C.L., for $\adm2=2.0 10^{-3} \text{eV}^2$). We propose a new experiment on the same site, Double-CHOOZ, to explore the range of $\s2t13$ from 0.2 to 0.03, within three years of data taking. The improvement of the CHOOZ result requires an increase in the statistics, a reduction of the systematic error below one percent, and a careful control of the cosmic ray induced background. Therefore, Double-CHOOZ will use two identical detectors, one at $\sim$150 m and another at 1.05 km distance from the nuclear cores. The plan is to start data taking with two detectors in 2008, and to reach a sensitivity of 0.05 in 2009, and 0.03 in 2011.
1:  PCC - Physique Corpusculaire et Cosmologie - Collège de France
2:  APC - UMR 7164 - AstroParticule et Cosmologie
3:  DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
4:  SUBATECH - Laboratoire SUBATECH Nantes
5:  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
Physics/High Energy Physics - Experiment
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