Agostin, M;
Bakalyarov, AM;
Balata, M;
Barabanov, I;
Baudis, L;
Bauer, C;
Bellotti, E;
... Zuzel, G; + view all
(2020)
Modeling of GERDA Phase II data.
Journal of High Energy Physics
, Article 139. 10.1007/JHEP03(2020)139.
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Abstract
The GERmanium Detector Array (Gerda) experiment at the Gran Sasso underground laboratory (LNGS) of INFN is searching for neutrinoless double-beta (0νββ) decay of {76^}Ge. The technological challenge of Gerda is to operate in a “background-free” regime in the region of interest (ROI) after analysis cuts for the full 100 kg·yr target exposure of the experiment. A careful modeling and decomposition of the full-range energy spectrum is essential to predict the shape and composition of events in the ROI around Q_{ββ}for the 0νββ search, to extract a precise measurement of the half-life of the double-beta decay mode with neutrinos (2νββ) and in order to identify the location of residual impurities. The latter will permit future experiments to build strategies in order to further lower the background and achieve even better sensitivities. In this article the background decomposition prior to analysis cuts is presented for Gerda Phase II. The background model fit yields a flat spectrum in the ROI with a background index (BI) of 16.04^{+0.78}_{-0.85}·10^{-3} cts/(keV·kg·yr) for the enriched BEGe data set and 14.68^{+0.47}_{-0.52}·10^{-3} cts/(keV·kg·yr) for the enriched coaxial data set. These values are similar to the one of Phase I despite a much larger number of detectors and hence radioactive hardware components.
| Type: | Article |
|---|---|
| Title: | Modeling of GERDA Phase II data |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1007/JHEP03(2020)139 |
| Publisher version: | https://doi.org/10.1007/JHEP03(2020)139 |
| Language: | English |
| Additional information: | © 2020 Springer Nature Switzerland AG. This article is distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/). |
| Keywords: | Dark Matter and Double Beta Decay (experiments) |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10111986 |
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