Details

Autor(en) / Beteiligte

• Arling, J.-H.
• Gerhardt, M.
• Gößling, C.
• Gehre, D.
• Klingenberg, R.
• Kröninger, K.
• Nitsch, C.
• Quante, T.
• Rohatsch, K.
• Tebrügge, J.
• Temminghoff, R.
• Theinert, R.
• Zatschler, S.
• Zuber, K.

Titel

Suppression of alpha-induced lateral surface events in the COBRA experiment using CdZnTe detectors with an instrumented guard-ring electrode

Ist Teil von

• Journal of instrumentation, 2017-11, Vol.12 (11), p.P11025-P11025

Ort / Verlag

Bristol: IOP Publishing

Erscheinungsjahr

2017

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The COBRA collaboration searches for neutrinoless double beta-decay (0νββ-decay) using CdZnTe semiconductor detectors with a coplanar-grid readout and a surrounding guard-ring structure. The operation of the COBRA demonstrator at the Gran Sasso underground laboratory (LNGS) indicates that alpha-induced lateral surface events are the dominant source of background events. By instrumenting the guard-ring electrode it is possible to suppress this type of background. In laboratory measurements this method achieved a suppression factor of alpha-induced lateral surface events of 5300+2660−1380, while retaining (85.3 ±0.1%) of gamma events occurring in the entire detector volume. This suppression is superior to the pulse-shape analysis methods used so far in COBRA by three orders of magnitude.