Mainz 2014 – scientific programme

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T: Fachverband Teilchenphysik

T 18: Niederenergie-Neutrinophysik 1

T 18.2: Talk

Monday, March 24, 2014, 11:15–11:30, P106

Pulse-shape discrimination of lateral surface events for the COBRA experiment — •Jan Tebrügge for the COBRA collaboration — Exp.Phys.IV, TU Dortmund

The aim of the Cadmium Zinc Telluride 0-Neutrino Double Beta Decay Research Apparatus (COBRA) experiment is to prove the existence of neutrinoless double beta decay by investigating the decay of the isotope 116Cd, with a sum energy of both electrons of 2.814 MeV. The experiment employs CdZnTe semiconductor detectors of the coplanar grid design. A DAQ system records complete signal forms, so that pulse shape analysis is possible. Events near the cathode and anode surfaces of a coplanar grid CdZnTedetector are identifiable by means of the interaction depth information encoded in the signal amplitudes. However, the amplitudes cannot be used to identify events near the lateral surfaces. In this talk a method is described to identify lateral surface events by means of their pulse shapes. Such identification is important for discriminating surface alpha particle interactions from more penetrating forms of radiation. The effectiveness of the presented technique is demonstrated using COBRA data as well as a dedicated setup with alpha and gamma sources.