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The performance of a 630g commercial broad energy germanium (BEGe) detectorhas been systematically investigated. Energy resolution, linearity, stabilityvs. high-voltage (HV) bias, thickness and uniformity of dead layers have beenmeasured and found to be excellent. Special attention has been dedicated to thestudy of the detector response as a function of bias HV. The nominal depletionvoltage being 3000V, the detector under investigation shows a peculiar behaviorfor biases around 2000V: in a narrow range of about 100V the charge collectionis strongly reduced. The detector seems to be composed by two parts: a smallvolume around the HV contact where charges are efficiently collected as athigher voltage, and a large volume where charges are poorly collected. Aqualitative explanation of this behavior is presented. An event-by-event pulseshape analysis based on A/E (maximum amplitude of the current pulse over thetotal energy released in the detector) has been applied to events in differentenergy regions and found very effective in rejecting non localized events. Inconclusion, BEGe detectors are excellent candidates for the second phase ofGERDA, an experiment devoted to neutrinoless double beta decay of Ge-76.

Characterization of a broad energy germanium detector and application to neutrinoless double beta decay search in Ge-76