Würzburg 2018 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 67: Neutrinophysik / theoretische Astroteilchenphysik

T 67.7: Gruppenbericht

Mittwoch, 21. März 2018, 18:00–18:20, Z6 - SR 2.011

Recent results of the Double Chooz reactor neutrino experiment — •Denise Hellwig for the Double Chooz collaboration — III. Physikalisches Institut B, RWTH Aachen University

Double Chooz is a reactor antineutrino disappearance experiment located in Chooz, France, to measure the neutrino mixing angle θ₁₃. By detecting the unique inverse beta decay (IBD) prompt-delayed signal antineutrinos can be precisely identified. The experiment consists of two liquid scintillator detectors of identical design; a far detector at a distance of about 1 km is operating since 2011; a near detector at a distance of about 400 m is operating since begin 2015. This double-detector setup with iso-flux configuration allows to fit the far detector data to the near detector data without relying on the reactor neutrino flux prediction where systematic uncertainties are suppressed to per mill level. Statistical uncertainties are reduced by not only using the delayed signal of neutron capture on Gadolinium but adding neutron captures on Hydrogen yielding a statistics increase of more than a factor of two.

Apart from a precise measurement of θ₁₃, the combination of the two detectors also offers sensitivity to sterile neutrino mixing parameters. Sterile neutrinos are neutrino mass states not taking part in weak interactions, but may mix with known neutrino states. This induces additional mixing angles and mass differences.

This contribution will present the latest θ₁₃ results of the Double Chooz collaboration as well as the results of the sterile analysis.