Speaker
Dr
Antoine Collin
(MPI für Kernphysik Heidelberg)
Description
The θ13 parameter of the PMNS mixing matrix remained unknown until the first hints and estimates by both reactor and beam experiments in 2011. The most competitive limit set by the Chooz experiment let indeed open the hypothesis of a null value. A precise measurement of a non zero value enables a future observation of the CP violation and the estimate of its phase δ. The Double Chooz experiment was designed in this context and aims for a precision measurement of the θ13 neutrino mixing angle. Located at the Chooz nuclear power plant in north-eastern France, it is searching for disappearance of antineutrinos produced by the two reactors. Double Chooz relies on a two identical detector measurement. The near detector, located at a few hundred meters from the cores, before the impact of θ13 is exerted, aims at monitoring the νe flux emitted by the reactors. The far detector is located at a distance of about one kilometer from the reactor cores, near the expected first maximum amplitude of the oscillation. The comparison of these two measurements gives an estimate of the deficit induced by the oscillation, canceling most of systematic uncertainties related to neutrino flux emission and detection. The far detector began data taking in April 2011 and gave the first hint of a non zero value of θ13 by a reactor experiment that same year. The analysis enhancements and the latest results of the experiment, based on a far detector only measurement, will be presented. Data taking in the near detector is about to start, enabling a significant reduction of both reactor and detector related systematic uncertainties in a near future. The RENO experiment, located near the six Yonggwang reactors in South Korea, is based on the same two detector concept as Double Chooz. The data taking began in summer 2011 and the first θ13 results were published in 2012. The latest results released by the RENO collaboration will also be presented in this talk.
Primary author
Dr
Antoine Collin
(MPI für Kernphysik Heidelberg)
