Neutrinoless double-beta decay search with the LEGEND experiment

Neutrinoless double-beta decay is a nuclear decay, given as (A,Z) → (A,Z+2)+2e-, with deep consepuences for the understanding of our universe. A strong experimental program is underway to search for this transition with many proposed experiments using different tecgnologies. In this article the LEGEND experiment, which uses 76Ge as the isotope of interest, will be described. We will discuss both the first stage, LEGEND-200, which is now taking data at the Laboratori Nazionali del Gran Sasso of INEN in Italy, and the future stage, LEGEND-10000 LEGEND-200 gas analyzed data collected from March 2023 to February 2024 for an exposure of 61 kg·yr with a background index not far away from its goal of 2×10-4 cnts/(keV·kg·yr). Combining the LEGEND-200 data with those of G<ns0:sc>ERDA</ns0:sc> and M<ns0:sc>AJORANA</ns0:sc> D<ns0:sc>EMONSTRATOR</ns0:sc> one obtains an exclusion sensitivity on tge half-life of 0νββ decay in 76Ge of T1/2 & 2.8 × 1026 yr at 90% C.L. and a limit on T1/2 > 1.9 × 1026 yr at 90% C.L.