| Title: |
An improved limit on the neutrinoless double-electron capture of 36Ar with GERDA |
| Authors: |
Agostini, M; Alexander, A; Araujo, GR; Bakalyarov, AM; Balata, M; Barabanov, I; Baudis, L; Bauer, C; Belogurov, S; Bettini, A; Bezrukov, L; Biancacci, V; Bossio, E; Bothe, V; Brudanin, V; Brugnera, R; Caldwell, A; Cattadori, C; Chernogorov, A; Comellato, T; D’Andrea, V; Demidova, EV; Marco, ND; Doroshkevich, E; Fischer, F; Fomina, M; Gangapshev, A; Garfagnini, A; Gooch, C; Grabmayr, P; Gurentsov, V; Gusev, K; Hakenmüller, J; Hemmer, S; Hofmann, W; Huang, J; Hult, M; Inzhechik, LV; Csáthy, JJ; Jochum, J; Junker, M; Kazalov, V; Kermaïdic, Y; Khushbakht, H; Kihm, T; Kilgus, K; Kirpichnikov, IV; Klimenko, A; Kneißl, R; Knöpfle, KT; Kochetov, O; Kornoukhov, VN; Korošec, M; Krause, P; Kuzminov, VV; Laubenstein, M; Lindner, M; Lippi, I; Lubashevskiy, A; Lubsandorzhiev, B; Lutter, G; Macolino, C; Majorovits, B; Maneschg, W; Manzanillas, L; Marshall, G; Misiaszek, M; Morella, M; Müller, Y; Nemchenok, I; Pandola, L; Pelczar, K; Pertoldi, L; Piseri, P; Pullia, A; Ransom, C; Rauscher, L; Redchuk, M; Riboldi, S; Rumyantseva, N; Sada, C; Salamida, F; Schönert, S; Schreiner, J; Schütt, M; Schütz, AK; Schulz, O; Schwarz, M; Schwingenheuer, B; Selivanenko, O; Shevchik, E; Shirchenko, M; Shtembari, L; Simgen, H; Smolnikov, A; Stukov, D; Vasenko, AA; Veresnikova, A; Vignoli, C; Sturm, KV |
| Source: |
European Physical Journal C , 84 (1) , Article 34. (2024) |
| Publisher Information: |
Springer Science and Business Media LLC |
| Publication Year: |
2024 |
| Collection: |
University College London: UCL Discovery |
| Description: |
The GERmanium Detector Array (Gerda) experiment operated enriched high-purity germanium detectors in a liquid argon cryostat, which contains 0.33% of 36 Ar, a candidate isotope for the two-neutrino double-electron capture (2 ν ECEC) and therefore for the neutrinoless double-electron capture (0 ν ECEC). If detected, this process would give evidence of lepton number violation and the Majorana nature of neutrinos. In the radiative 0 ν ECEC of 36 Ar, a monochromatic photon is emitted with an energy of 429.88 keV, which may be detected by the Gerda germanium detectors. We searched for the 36 Ar 0 ν ECEC with Gerda data, with a total live time of 4.34 year (3.08 year accumulated during Gerda Phase II and 1.26 year during Gerda Phase I). No signal was found and a 90% CL lower limit on the half-life of this process was established T1 / 2> 1.5 · 10 22 year. |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/pdf |
| Language: |
English |
| Relation: |
https://discovery.ucl.ac.uk/id/eprint/10186319/1/ar.pdf; https://discovery.ucl.ac.uk/id/eprint/10186319/ |
| Availability: |
https://discovery.ucl.ac.uk/id/eprint/10186319/1/ar.pdf; https://discovery.ucl.ac.uk/id/eprint/10186319/ |
| Rights: |
open |
| Accession Number: |
edsbas.E21B47AF |
| Database: |
BASE |