Münster 2017 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 57: Neutrinophysik 5 (Reaktorneutrinos)
T 57.2: Vortrag
Dienstag, 28. März 2017, 17:05–17:20, VSH 07
Consistencies of the neutron detection efficiency in the Double Chooz reactor neutrino detectors — •Helena Almazan, Christian Buck, Julia Haser, and Manfred Lindner — Max-Planck-Institut für Kernphysik (MPIK)
The Double Chooz experiment, analysing the reactor antineutrino signal from the nuclear power plant in Chooz (France), aims for a precision measurement of the neutrino mixing angle θ13 with the new data collected at the near and far detectors. An accurate and precisely known detection efficiency of the electron antineutrino interaction νe + p → e+ + n, called inverse beta decay (IBD), is required in order to reach that goal. The detection efficiency of the correlated signal caused by the IBD reaction produces strongly depends on the performance of the neutron detection, and it comprises one of the dominant uncertainties in the θ13 estimation. Among other calibration methods, the deployment of a 252Cf radioactive source at the detector center and along a deployment tube is used to study the neutron capture signal in different detectors’ inner volumes.
The recently collected 252Cf data has been studied and compared to Monte Carlo simulations. In that way, the fraction of n-captures on Gadolinium (atoms loaded in the neutrino target) has been estimated to prove the time stability and consistency between detectors, and to study the behaviour of the neutron captures at the inner volume borders. These results and the performed estimation of the systematic uncertainties of the neutron capture efficiency provide a crucial input for the antineutrino oscillation analysis with two detectors.