München 2019 – wissenschaftliches Programm
HK 29.1: Gruppenbericht
Dienstag, 19. März 2019, 16:30–17:00, HS 18
The Large Enriched Germanium Experiment for Neutrinoless double beta Decay - LEGEND — •Yoann Kermaidic for the LEGEND collaboration — Max Planck Institute für Kernphysik 1 Saupferchekweg 69117 Heidelberg
The search for neutrinoless double beta (0νββ) decay is a very sensitive probe of whether neutrinos are Dirac or Majorana particles. Its discovery could have far reaching consequences for particle physics and cosmology (leptogenesis). Current 76Ge-based experiments, Gerda and Majorana Demonstrator, benefit from the best energy resolution and the lowest background in the signal region in the field if normalized by the resolution. These superior characteristics allow the 76Ge program to reach a half-life sensitivity over 1026 yr in 2018, and demonstrates the feasibility of deploying a large-scale next-generation 76Ge-based experiment. The Legend (Large Enriched Germanium Experiment for Neutrinoless ββ Decay) collaboration has been founded with the goal to build a ton-scale experiment and boost the 0νββ decay half-life sensitivity by two orders of magnitude. The collaboration pursues a phased approach, based on the Gerda and Majorana Demonstrator experience, starting in 2021 with 200 kg of 76Ge. I will present the general aspect of Legend and focus on the ongoing developments for Legend-200, which will make use of the Gerda cryostat at the underground Laboratori Nazionali del Gran Sasso in Italy.