Abstract
The MAJORANA DEMONSTRATOR will search for the neutrinoless double beta decay (ββ(0ν)) of the isotope 76Ge with a mixed array of enriched and natural germanium detectors. In view of the next generation of tonne-scale germanium-based ββ(0ν)-decay searches, a major goal of the MAJORANA DEMONSTRATOR is to demonstrate a path forward to achieving a background rate at or below 1 cnt/(ROI-t-y) in the 4 keV region of interest (ROI) around the 2039-keV Q-value of the 76Ge ββ(0ν)-decay. Such a requirement on the background level significantly constrains the design of the readout electronics, which is further driven by noise and energy resolution performances. We present here the low-noise low- background front-end electronics developed for the low-capacitance p-type point contact (P-PC) germanium detectors of the MAJORANA DEMONSTRATOR. This resistive-feedback front-end, specifically designed to have low mass, is fabricated on a radioassayed fused-silica substrate where the feedback resistor consists of a sputtered thin film of high purity amorphous germanium and the feedback capacitor is based on the capacitance between gold conductive traces.
Original language | English |
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Pages (from-to) | 654-657 |
Number of pages | 4 |
Journal | Physics Procedia |
Volume | 61 |
DOIs | |
State | Published - 2015 |
Externally published | Yes |
Event | 13th International Conference on Topics in Astroparticle and Underground Physics, TAUP 2013 - , United States Duration: 8 Sep 2013 → 13 Sep 2013 |
Keywords
- charge sensitive amplifer
- low background
- low noise
- neutrinoless double beta decay
- resistive-feedback front-end