LEGEND-1000 Preconceptual Design Report

• DOI: 10.48550/arxiv.2107.11462
• Publication Date: 2021-01-01
• Authors: Collaboration, LE...; Abgrall, N; Abt, I; Agostini, M; Alexander, A; Andreoiu, C; Araujo, GR; III, FT Avignone; Bae, W; Bakalyarov, A; Balata, M; Bantel, M; Barabanov, I; Barabash, AS; Barbeau, PS; Barton, CJ; Barton, PJ; Baudis, L; Bauer, C; Bernieri, E; Bezrukov, L; Bhimani, KH; Biancacci, V; Blalock, E; Bolozdynya, A; Borden, S; Bos, B; Bossio, E; Boston, A; Bothe, V; Bouabid, R; Boyd, S; Brugnera, R; Burlac, N; Busch, M; Caldwell, A; Caldwell, TS; Carney, R; Cattadori, C; Chan, Y-D; Chernogorov, A; Christofferson, CD; Chu, P-H; Clark, M; Cohen, T; Combs, D; Comellato, T; Cooper, RJ; Costa, IA; D'Andrea, V; Detwiler, JA; Giacinto, A Di; Marco, N Di; Dobson, J; Drobizhev, A; Durand, MR; Edzards, F; Efremenko, Yu; Elliott, SR; Engelhardt, A; Fajt, L; Faud, N; Febbraro, MT; Ferella, F; Fields, DE; Fischer, F; Fomina, M; Fox, H; Franchi, J; Gala, R; Galindo-Uribarri, A; Gangapshev, A; Garfagnini, A; Geraci, A; Gilbert, C; Gold, M; Gooch, C; Gradwohl, KP; Green, MP; Grinyer, GF; Grobov, A; Gruszko, J; Guinn, I; Guiseppe, VE; Gurentsov, V; Gurov, Y; Gusev, K; Hacket, B; Hagemann, F; Hakenmüeller, J; Haranczyk, M; Hauertmann, L; Haufe, CR; Hayward, C; Heffron, B; Henkes, F; Henning, R; Aguilar, D Hervas; Hinton, J; Hodak, R; Hoffmann, H; Hofmann, W; Hostiuc, A; Huang, J; Hult, M; Mirza, M Ibrahim; Jochum, J; Jones, R; Judson, D; Junker, M; Kaizer, J; Kazalov, V; Kermaïdic, Y; Khushbakht, H; Kidd, M; Kihm, T; Kilgus, K; Kim, I; Klimenko, A; Knöpfle, KT; Kochetov, O; Konovalov, SI; Kontul, I; Kool, K; Kormos, LL; Kornoukhov, VN; Korosec, M; Krause, P; Kuzminov, VV; López-Castaño, JM; Lang, K; Laubenstein, M; León, E; Lehnert, B; Leonhardt, A; Li, A; Lindner, M; Lippi, I; Liu, X; Liu, J; Loomba, D; Lubashevskiy, A; Lubsandorzhiev, B; Lusardi, N; Müller, Y; Macko, M; Macolino, C; Majorovits, B; Mamedov, F; Maneschg, W; Manzanillas, L; Marshall, G; Martin, RD; Martin, EL; Massarczyk, R; Mei, D; Meijer, SJ; Mertens, S; Misiaszek, M; Mondragon, E; Morella, M; Morgan, B; Mroz, T; Muenstermann, D; Nave, CJ; Nemchenok, I; Neuberger, M; Oli, TK; Gann, G Orebi; Othman, G; Palušova, V; Panth, R; Papp, L; Paudel, LS; Pelczar, K; Perez, J Perez; Pertoldi, L; Pettus, W; Piseri, P; Poon, AWP; Povinec, P; Pullia, A; Radford, DC; Ramachers, YA; Ransom, C; Rauscher, L; Redchuk, M; Reine, AL; Riboldi, S; Rielage, K; Rozov, S; Rukhadze, E; Rumyantseva, N; Runge, J; Ruof, NW; Saakyan, R; Sailer, S; Salamanna, G; Salamida, F; Salvat, DJ; Shevchik, E; Szczepaniec, K; Tagnani, D; Vetter, K
• Keywords: LEGEND - Abteilung Hinton; Physics - Instrumentation and Detectors; 0103 physical sciences; FOS: Physical sciences; Instrumentation and Detectors (physics.ins-det); Nuclear Experiment (nucl-ex); nucl-ex; physics.ins-det; Nuclear Experiment; 7. Clean energy; 01 natural sciences

We propose the construction of LEGEND-1000, the ton-scale Large Enriched Germanium Experiment for Neutrinoless $ββ$ Decay. This international experiment is designed to answer one of the highest priority questions in fundamental physics. It consists of 1000 kg of Ge detectors enriched to more than 90% in the $^{76}$Ge isotope operated in a liquid argon active shield at a deep underground laboratory. By combining the lowest background levels with the best energy resolution in the field, LEGEND-1000 will perform a quasi-background-free search and can make an unambiguous discovery of neutrinoless double-beta decay with just a handful of counts at the decay $Q$ value. The experiment is designed to probe this decay with a 99.7%-CL discovery sensitivity in the $^{76}$Ge half-life of $1.3\times10^{28}$ years, corresponding to an effective Majorana mass upper limit in the range of 9-21 meV, to cover the inverted-ordering neutrino mass scale with 10 yr of live time.