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The description of the production process and of the characterisation of low-neutron emission 228-Th sources for the calibration of the neutrinloess double-beta decay experiment LEGEND-200 was published todayin JINST 18, 2023.
We actively contributed to the measurement and analysis of the neutron flux emitted by the sources, revealing a negligible contribution to the background level in the region-of-interest. Using source-insertion systems developed by our group at UZH, these radioactive sources are regularly deployed in the vicinity of the high-purity Ge detectors in LEGEND-200, which started a first science run in late 2022. The goal is to calibrate the energy response of the Ge diodes, to measure their resolution, and to tailor and validate pulse shape analysis algorithms.
