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T: Fachverband Teilchenphysik

T 40: Niederenergie-Neutrinophysik 2

T 40.7: Talk

Monday, March 24, 2014, 18:30–18:45, P106

⁹Li & ⁸He Contamination in the Hydrogen Capture Neutrino Sample in Double Chooz — •Lee F F Stokes, Josef Jochum, Tobias Lachenmaier, Michael Wurm, and Markus Röhling for the Double Chooz collaboration — Physikalisches Institut, Universität Tübingen

Double Chooz is a reactor ν_e disappearance experiment whose aim is to measure the neutrino mixing angle θ₁₃. Along with the two competing reactor experiments Daya Bay and RENO, Double Chooz searches for a prompt positron signal followed by a delayed neutron capture on gadolinium.
Whilst our competitors have at least a far and near detector, Double Chooz is limited to data taking with the far detector only whilst the near detector is under construction. To compete, Double Chooz has increased the number of neutrino candidates at its disposal by using neutrinos whose delayed neutron capture is on hydrogen and has as a result published a θ₁₃ measurement using the hydrogen capture analysis only.
In the framework of the hydrogen analysis, the second largest component of the background after the accidentals is the cosmogenic contribution from the decay of ⁹Li and ⁸He. I will show a preliminary look at the analysis dedicated to finding this component in the hydrogen capture neutrino sample.