Münster 2017 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 57: Neutrinophysik 5 (Reaktorneutrinos)
T 57.3: Vortrag
Dienstag, 28. März 2017, 17:20–17:35, VSH 07
Background studies for the neutrino oscillation experiment Double Chooz — •Matthias Koch, Simon Appel, Marianne Göger-Neff, Lothar Oberauer, and Stefan Schönert — Physik Department E15, Technische Universität München
The two detectors of the Double Chooz experiment in France are investigating the neutrino mixing angle θ13. In this work a background analysis for the first sample of data from the near detector with an absolute live time of 364 days was performed. The analysis was done by searching for the distinctive pattern of a beta particle from the decay of 214Bi and 212Bi followed by an alpha particle from the decay of 214Po and 212Po within a short time period, known as BiPo coincidence. Because 214Bi and 214Po are members of the uranium chain and 212Bi and 212Po are part of the thorium chain looking for BiPo coincidences is a good method to estimate the level of radiopurity inside the detector. It was found that the number of coincidences is constant over the time indicating radioactive equilibrium in the uranium and the thorium decay chain. Also the mass concentration of uranium and thorium in the inner detector was calculated to be less than 10−13 g/g, which agrees well with the specification.
This work was supported by the DFG (GO 1729/1-1), the MLL at Garching and the Excellence Cluster ’Universe’.