Radiogenic and Cosmogenic neutrons at LEGEND-1000

Neutrinoless double beta decay (0νββ) is a rare decay process that is possible only if neutrinos are their own antiparticles. A discovery of 0νββ would also explicitly show that the total lepton number is violated with profound physics implications. The Large Enriched Germanium Experiment for Neutrinoless Double Beta Decay (LEGEND) aims to develop a phased ⁷⁶Ge-based 0νββ experimental program with the discovery potential of a half-life beyond 10²⁸ years. The second phase of LEGEND – LEGEND-1000 -- will consist of approximately 400 high purity germanium detectors with a total mass of 1000 kg made from germanium enriched to at least 90% in ⁷⁶Ge. In order to achieve the sensitivity goal, the background level of LEGEND-1000 needs to be less than 1*10^-5 cts/keV kg yr at the Q-value of 0νββ (2039 keV). Background modeling based on Monte Carlo simulations and calculations suggests that this background goal can be achieved. In this talk, we will discuss our investigations of radiogenic and cosmogenic neutrons at LEGEND-1000, which is found to be a subdominant background component for the baseline design of LEGEND-1000.