Speaker
Description
The LEGEND-200 experiment at Laboratori Nazionali del Gran Sasso, is designed to search
for neutrinoless double beta decay of 76Ge. The experiment uses about 200 kg of high-purity
germanium (HPGe) detectors, enriched in 76Ge, deployed within a cryostat filled with liquid
argon (LAr). The LAr acts as a cooling medium and as an active shield. The LAr
instrumentation is deployed in LEGEND-200 to detect the LAr scintillation light emitted by
background nuclear processes occurring within the LAr and that accompany signal response
in the HPGe detectors. Background events originate from α-, β-, γ- or neutron interactions,
coming from primordial, anthropogenic or cosmogenic unstable isotopes. They may impact
the detection of neutrinoless double beta decay signals, which involve energy deposition
inside the HPGe detectors, with no corresponding energy deposition occurring in the LAr.
The poster will cover the LAr instrumentation setup, the performance during
commissioning and physics runs. The Event Topology Classifier (ETC) utilized to
discriminate between β/γ and α radiation will also be presented. We showcase the ETC’s
role in tagging delayed Po-alphas depositing energy in the LAr following prompt signals of
Bi-gammas detected in the HPGe detectors.
This work is supported by the U.S. DOE and the NSF, the LANL, ORNL and LBNL
LDRD programs; the European ERC and Horizon programs; the German DFG, BMBF, and
MPG; the Italian INFN; the Polish NCN and MNiSW; the Czech MEYS; the Slovak SRDA;
the Swiss SNF; the UK STFC; the Russian RFBR; the Canadian NSERC and CFI; the
LNGS, SNOLAB, and SURF facilities.
| Poster prize | Yes |
|---|---|
| Collaboration (if any) | LEGEND |
