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T: Fachverband Teilchenphysik

T 39: Halbleiter 2

T 39.7: Talk

Monday, March 24, 2014, 18:15–18:30, P109a

Surface effects in Segmented Germanium Detectors — •Lucia Garbini for the GeDet collaboration — Max-Planck-Institut für Physik, München

Germanium detectors are widely used to explore neutrino-less double beta (0 ν β β) decay. One of the most important aspects while looking for rare events, as 0 ν β β decay, is to try to have every source of background under control. In underground laboratories, the effects from cosmic radiation and natural radioactivity are reduced. Surface contamination occurring during detector production can be a problem. Typical examples are ²¹⁰Pb, coming from ²²²Rn, and ²²⁶Ra, from the ²³⁸U chain. It’s therefore really important to characterize the response of Germanium detectors to alpha particles in order to classify such events as background events. In this talk, results obtained with a cylindrical true coaxial n-type segmented germanium detector, using the GALATEA test facility, are presented. A passivated end-plate of the detector was scanned with a collimated ²⁴¹Am source.