Author/Authors :
Fritts، نويسنده , , M. and Tebrügge، نويسنده , , Antje J. and Durst، نويسنده , , Tibor J. and Ebert، نويسنده , , J. and Gِكling، نويسنده , , C. and Gِpfert، نويسنده , , T. and Gehre، نويسنده , , D. and Hagner، نويسنده , , C. and Heidrich، نويسنده , , N. and Homann، نويسنده , , M. and Kِttig، نويسنده , , T. and Neddermann، نويسنده , , T. and Oldorf، نويسنده , , C. and Quante، نويسنده , , T. and Rajek، نويسنده , , A. J. Reinecke and S. A. Reinecke ، نويسنده , , O. and Schulz، نويسنده , , O. and Timm، نويسنده , , J. and Wonsak، نويسنده , , B. and Zuber، نويسنده , , K.، نويسنده ,
Abstract :
Events near the cathode and anode surfaces of a coplanar grid CdZnTe detector 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 paper a method is described to identify lateral surface events by means of their pulse shapes. Such identification allows for discrimination of surface alpha particle interactions from more penetrating forms of radiation, which is particularly important for rare event searches. The effectiveness of the presented technique in suppressing backgrounds due to alpha contamination in the search for neutrinoless double beta decay with the COBRA experiment is demonstrated.
Keywords :
Coplanar grid , CZT , Double beta decay , Pulse shape , Lateral surface event , Semiconductor detector
