Speaker
Description
The delayed decay of $^{77(\mathrm{𝑚})}$Ge, produced by neutron capture on $^{76}$Ge, is a potential background for the next generation neutrinoless double beta decay experiment LEGEND-1000 at the LNGS site. Based on Monte Carlo simulations, several mitigation strategies and suppression techniques have been proposed to identify and suppress this background [1,2,3]. So far, only weak experimental limits have been found on the production rate. We present new results from the GERDA experiment on the search for $^{77(\mathrm{𝑚})}$Ge by exploiting the isomeric state in $^{77}$As. Given the very similar configuration - bare germanium detectors in liquid argon - it serves as a benchmark for our LEGEND-1000 predictions. This research was supported by the BMBF through the Verbundforschung 05A20WO2 and by the DFG through the SFB1258 and the Excellence Cluster ORIGINS.
[1] C. Wiesinger et al., Eur. Phys. J. C (2018) 78: 597
[2] LEGEND-1000 pCDR, arXiv 2107.11462
[3] M. Neuberger et al., 2021 J. Phys.: Conf. Ser. 2156 012216
| Submitted on behalf of a Collaboration? | Yes |
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