The LEGEND-200 project is a successor of the US-led MAJORANA DEMONSTRATOR and EU-led GERDA projects. These projects seek the answer to the question of whether neutrinos are their own antiparticle by looking for a Standard-Model-forbidden decay called neutrinoless double-beta decay in the 76Ge nucleus. Observing this decay would show that neutrinos are their own antiparticles and help explain how matter formed in the early universe.
The MAJORANA DEMONSTRATOR has completed its data collection at the Sanford Underground Research Facility in South Dakota. LEGEND-200 is operating at Laboratori Nazionali del Gran Sasso in Italy. Its second phase, LEGEND-1000, which has about 5 times as many decaying 76Ge nuclei, is under consideration for funding. The LBNL Neutrinos Program designed and built the best-in-class low-noise front-end electronics for MAJORANA DEMONSTRATOR and LEGEND-200, and is leading the electronics effort in LEGEND-1000.
