Göttingen 2012 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 31: Neutrinophysik mit Beschleunigern

T 31.4: Vortrag

Freitag, 2. März 2012, 10:15–10:30, ZHG 105

Track reconstruction in unsegmented liquid scintillator detectors — •Dominikus Hellgartner — for the LENA working group — Technische Universität München, Physik Department E15, James Franck Straße, 85748 Garching

Liquid scintillator detectors, like the proposed 50 kt LENA (Low Energy Neutrino Astronomy) detector, are generally known for their low energy threshold and their high energy resolution. Just recently, it was realized that, despite the isotropic light emission, a reconstruction of lepton tracks with energies above a few 100 MeV is possible in liquid scintillator detectors by exploiting the arrival times of the photons.

Thus a reconstruction for electron and muon tracks was developed. It utilizes a likelihood fit to the integrated charge and the arrival time of the first detected photon at each PMT. Monte Carlo simulations indicate, that with this method, a vertex resolution between 2 and 7 cm, an angular resolution from 1.5 to 5 degrees and an energy resolution of about 0.5% can be achieved in the sub-GeV energy range. The reconstruction was extended to include point-like vertices. Using simulated β-beam events, the energy threshold for muon-track reconstruction was found to be around 200 MeV. Currently there is ongoing work to extend the track reconstruction to higher energies and more complex event topologies.

This work has been supported by the SFB TR 27, the cluster of excellence "Origin and Structure of the Universe" and the Helmholtz Alliance for Astroparticle Physics