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- W2467418453 abstract "A detailed study of alpha interactions on the passivated surface of a germanium detector ispresented. Germanium detectors can be used to search for both neutrinoless double betadecay of 76Ge and direct interaction of dark matter. In order to increase the sensitivity toboth neutrinoless double beta decay and dark matter beyond the current state of the art,the next generation of germanium-based experiments has to have a mass of about one tonand has to reduce the background by a factor of ten. The choices of detector technologyfacilitating both searches and the background reduction are one of the biggest challengesfor such an experiment. Surface contaminations on the material close to the detectors oron the detectors themselves, can generate a background due to alpha particles, which wasfound to be limiting in some experiments.The characterization of events induced by alpha particles will help to identify suchevents and thus eliminate them as sources of background. An especially designed segmentedtrue-coaxial detector was probed with alpha particles from an 241Am source inside thetest-stand GALATEA, located at the MPI f¨ur Physik in Munich. Pulse shape analysis wasperformed to identify the characteristics of alpha events. The properties of the detectordirectly underneath the passivation layer on the end-plate were also studied. As part ofthe detector characterization, the thickness of the effective dead layer was determined.The studies presented here suggest improvements on detector design, which wouldallow an effective reduction of alpha background in next generation of germanium-basedexperiments." @default.
- W2467418453 created "2016-07-22" @default.
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- W2467418453 date "2016-05-02" @default.
- W2467418453 modified "2023-09-27" @default.
- W2467418453 title "Alpha-event characterization for germanium detectors" @default.
- W2467418453 hasPublicationYear "2016" @default.
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