Abstract
Gerda is designed for a background-free search of 76Ge neutrinoless double-β decay, using bare Ge detectors in liquid Ar. The experiment was upgraded after the successful completion of Phase I to double the target mass and further reduce the background. Newly-designed Ge detectors were installed along with LAr scintillation sensors. Phase II of data-taking started in Dec 2015 with approximately 36 kg of Ge detectors and is currently ongoing. The first results based on 10.8 kg· yr of exposure are presented. The background goal of 10−3 cts/(keV· kg· yr) is achieved and a search for neutrinoless double-β decay is performed by combining Phase I and II data. No signal is found and a new limit is set at yr (90% C.L.).
Highlights
The Gerda experiment[1] is designed to search for the neutrinoless double-β (0νββ) decay of 76Ge into 76Se and two electrons
Gerda is designed for a background-free search of 76Ge neutrinoless double-β decay, using bare Ge detectors in liquid Ar
The innovative approach of Gerda consists of operating the bare detectors in liquid Ar (LAr), which acts as a cooling material, passive shielding against external natural radioactivity and scintillating veto
Summary
- Measurement of the double- decay half-life and search for the neutrinoless doubledecay of 48Ca with the NEMO-3 detector David Waters, Cristóvão Vilela and NEMO-3 collaboration. M Agostini1,∗, M Allardt, A M Bakalyarov, M Balata, I Barabanov, L Baudis, C Bauer, E Bellotti, S Belogurov, S T Belyaev, G Benato, A Bettini, L Bezrukov, T Bode, D Borowicz, V Brudanin, R Brugnera, A Caldwell, C Cattadori, A Chernogorov, V D’Andrea, E V Demidova, N Di Marco, A Domula, E Doroshkevich, V Egorov, R Falkenstein, N Frodyma, A Gangapshev, A Garfagnini, C Gooch, P Grabmayr, V Gurentsov, K Gusev, J Hakenmuller, A Hegai, M Heisel, S Hemmer, W Hofmann, M Hult, L V Inzhechik, J Janicsko Csathy, J Jochum, M Junker, V Kazalov, T Kihm, I V Kirpichnikov, A Kirsch, A Kish, A Klimenko, R Kneißl, K T Knopfle, O Kochetov, V N Kornoukhov, V V Kuzminov, M Laubenstein, A Lazzaro, V I Lebedev, B Lehnert, H Y Liao, M Lindner, I Lippi, A Lubashevskiy, B Lubsandorzhiev, G Lutter, C Macolino, B Majorovits, W Maneschg, E Medinaceli, M Miloradovic, R Mingazheva, M Misiaszek, P Moseev, I Nemchenok, D Palioselitis, K Panas, L Pandola, K Pelczar, A Pullia, S Riboldi, N Rumyantseva, C Sada, F Salamida, M Salathe, C Schmitt, B Schneider, S Schonert, J Schreiner, O Schulz, A-K Schutz, B Schwingenheuer, O Selivanenko, E Shevchik, M Shirchenko, H Simgen, A Smolnikov, L Stanco, L Vanhoefer, A A Vasenko, A Veresnikova, K von Sturm, V Wagner, A Wegmann, T Wester, C Wiesinger, M Wojcik, E Yanovich, I Zhitnikov, S V Zhukov, D Zinatulina, K Zuber, G Zuzel
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