Double beta decay search with LEGEND-200
ORAL
Abstract
LEGEND (Large Enriched Germanium Experiment for Neutrinoless double beta Decay) uses High Purity Germanium (HPGe) detectors to search for lepton number violation in the neutrino sector. The HPGe detectors are isotopically enriched with 76Ge and immersed in liquid argon (LAr), which serves as shielding and active veto system.
The LEGEND collaboration was formed 5 years ago, connecting members of the Majorana Demonstrator and GERDA experiments with other scientists. We established a global, multi-stage strategy to use 76Ge for 0νββ searches. LEGEND-200 is the first stage and is currently being installed at the Laboratori Nazionali del Gran Sasso (Italy) in the existing GERDA facility. It is designed to achieve about a factor of 10 increase in exposure (1,000 kg×yr), background reduction (2×10-4 cts/kg/keV/yr), and half-life discovery sensitivity (1027 yr) compared to the previous generation experiments. Commissioning is foreseen by the end of 2021, followed by a 5-year data-taking period.
LEGEND-200 will serve as a testbed for technology improvements and as an intermediate step to the tonne-scale LEGEND-1000 project. This second stage is envisioned for deployment at SNOLAB (ON, Canada) and aims at increasing the exposure (10,000 kg×yr), background reduction (10-5 cts/kg/keV/yr), and discovery sensitivity (1028 yr) by another factor of 10 over a 10-year data-taking period.
This talk presents the physics reach of LEGEND-200, new technologies deployed, and reports on the status of the ongoing installation.
The LEGEND collaboration was formed 5 years ago, connecting members of the Majorana Demonstrator and GERDA experiments with other scientists. We established a global, multi-stage strategy to use 76Ge for 0νββ searches. LEGEND-200 is the first stage and is currently being installed at the Laboratori Nazionali del Gran Sasso (Italy) in the existing GERDA facility. It is designed to achieve about a factor of 10 increase in exposure (1,000 kg×yr), background reduction (2×10-4 cts/kg/keV/yr), and half-life discovery sensitivity (1027 yr) compared to the previous generation experiments. Commissioning is foreseen by the end of 2021, followed by a 5-year data-taking period.
LEGEND-200 will serve as a testbed for technology improvements and as an intermediate step to the tonne-scale LEGEND-1000 project. This second stage is envisioned for deployment at SNOLAB (ON, Canada) and aims at increasing the exposure (10,000 kg×yr), background reduction (10-5 cts/kg/keV/yr), and discovery sensitivity (1028 yr) by another factor of 10 over a 10-year data-taking period.
This talk presents the physics reach of LEGEND-200, new technologies deployed, and reports on the status of the ongoing installation.
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Presenters
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Bjoern Lehnert
Authors
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Bjoern Lehnert