Towards the Development of Highly Integrated Low-mass Signal Readout Electronics for Germanium Detectors

The LEGEND experiment is a future large-scale experiment that will search for the neutrinoless double beta decay (0$\nu \beta \beta$) in the isotope ${}^{76}$Ge using high purity germanium detectors. Its observation would decisively proof that neutrinos are their own antiparticles, reveal that the conservation of the lepton number is violated and provide information on the neutrino mass. This talk focuses on the signal readout which is one of the most important components of a 0$\nu \beta \beta$ experiment since it facilitates the conversion of charges produced within the detectors into appropriately shaped voltage signals. Current 0$\nu \beta \beta$ experiments such as GERDA and Majorana Demonstrator use a discrete signal readout solution consisting of a JFET amplifier, an RC-circuit and a preamplifier. We are developing a highly integrated low-mass signal amplifier based on state-of-the-art application specific integrated circuit (ASIC) technology which allows for the combination of all relevant components in a single low-mass chip.