Heidelberg 2015 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 43: Astroparticle Physics 2

HK 43.7: Vortrag

Mittwoch, 25. März 2015, 16:15–16:30, M/HS4

Discrimination of Alpha Particles via Pulse Shape Analysis for the COBRA Experiment — •Henning Rebber — Universität Hamburg, Institut für Experimentalphysik, 22761 Hamburg

The aim of the COBRA experiment is to detect neutrinoless double beta decay using CdZnTe semiconductor detectors. A background rate of the order of 10⁻³ counts/keV/kg/year is intended in order to be sensitive to a half-life larger than 10²⁶ years. Measurements from a demonstrator set-up and Monte Carlo simulations indicate that a large background component is due to alpha particles. These generate charge clouds of only few µm in diameter in the detector, leading to characteristic pulse features. The pulse shapes of all event signals are read out by FADCs with a sampling rate of 100 MHz.

In this talk a method is described to identify alpha events based on a pulse shape analysis. Efficiency studies based on simulated pulse shapes are also discussed.