Matthias Allardt

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Neutrinoless double beta decay is a process that violates lepton number conservation. It is predicted to occur in extensions of the standard model of particle physics. This Letter reports the results from phase I of the Germanium Detector Array (GERDA) experiment at the Gran Sasso Laboratory (Italy) searching for neutrinoless double beta decay of the(More)
Extended defects such as dislocations and grain boundaries have a strong influence on the performance of microelectronic devices and on other applications of semiconductor materials. However, it is still under debate how the defect structure determines the band structure, and therefore, the recombination behavior of electron-hole pairs responsible for the(More)
In this project, the creation and evolution of radiationinduced defects in semiconductors was studied by ionoluminescence. This technique allows in-situ studies of radiative recombination of electron-hole pairs produced during the irradiation with energetic ions. Damage formation by high energy ions is complex and includes different processes starting with(More)
An optimized digital shaping filter has been developed for the GERDA experiment which searches for neutrinoless double beta decay in 76Ge. The GERDA Phase I energy calibration data have been reprocessed and an average improvement of 0.3 keV in energy resolution (FWHM) at the 76Ge Q value for 0νββ decay is obtained. This is possible thanks to the enhanced(More)
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