Browsing by Author "Konno, T."

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    Background-independent measurement of theta(13) in Double Chooz
    (Elsevier, 2014) Double Chooz Collaboration; Busenitz, J.; Elnimr, M.; Fernandes, S.M.; Konno, T.; Kuze, M.; Sharankova, R.; Stancu, I.; RWTH Aachen University; University of Alabama Tuscaloosa; United States Department of Energy (DOE); Argonne National Laboratory; Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute of Nuclear and Particle Physics (IN2P3); UDICE-French Research Universities; Universite PSL; Universite Paris Cite; Observatoire de Paris; CEA; Centro Brasileiro de Pesquisas Fisicas; University of Chicago; Centro de Investigaciones Energeticas, Medioambientales Tecnologicas; Columbia University; University of California System; University of California Davis; Drexel University; Hiroshima Institute of Technology; Illinois Institute of Technology; Russian Academy of Sciences; Institute for Nuclear Research of the Russian Academy of Sciences; Kansas State University; Kobe University; National Research Centre - Kurchatov Institute; Massachusetts Institute of Technology (MIT); Max Planck Society; Niigata University; University of Notre Dame; Universites de Strasbourg Etablissements Associes; Universite de Strasbourg; IMT - Institut Mines-Telecom; IMT Atlantique; Nantes Universite; Technical University of Munich; University of Tennessee System; University of Tennessee Knoxville; Tohoku University; Tohoku Gakuin University; Tokyo Institute of Technology; Tokyo Metropolitan University; Eberhard Karls University of Tubingen; Universidade Federal do ABC (UFABC); Universidade Estadual de Campinas; Virginia Polytechnic Institute & State University
    The oscillation results published by the Double Chooz Collaboration in 2011 and 2012 rely on background models substantiated by reactor-on data. In this analysis, we present a background-model-independent measurement of the mixing angle \(\theta_{13}\) by including 7.53 days of reactor-off data. A global fit of the observed antineutrino rates for different reactor power conditions is performed, yielding a measurement of both \(\theta_{13}\) and the total background rate. The results on the mixing angle are improved significantly by including the reactor-off data in the fit, as it provides a direct measurement of the total background rate. This reactor rate modulation analysis considers antineutrino candidates with neutron captures on both Gd and H, whose combination yields sin² (2\(\theta_{13}\))=0.102±0.028(stat.)±0.033(syst.). The results presented in this study are fully consistent with the ones already published by Double Chooz, achieving a competitive precision. They provide, for the first time, a determination of \(\theta_{13}\) that does not depend on a background model.