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20th LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS
31
The GERDA Experiment in the Search for Neutrinoless Double-Beta Decay
Valentina Biancacci (GERDA Collaboration) E-mail: valentina. biancacci@pd. infn. it
1Dipartimento di Fisica e Astronomia, Universita degli Studi di Padova, Padua, Italy
2INFN Padova, Padua, Italy Received January 16, 2022
An open question still involves the nature of neutrinos: are they equal to their anti-matter counterpart? The most promising way to test this Majorana nature of neutrinos is searching for the neutrinoless double beta decay (0v^), a hypothetical lepton number violating nuclear process. Furthermore, its observation would give an extraordinary insight into why our universe is predominantly composed of matter, which is another unsolved puzzle of cosmology and particle physics. Since 2011, the Gerda collaboration has searched for of 76Ge by operating bare germanium detectors, enriched in the double-beta decaying isotope 76Ge, in liquid argon. Exploiting the combination of excellent energy resolution of germanium detectors and scintillating properties of argon, the Gerda experiment succeeded to achieve an unprecedented background-free regime. In December 2019, after fulfilling and exceeding the design goals of the experiment, data taking was stopped. No signal has been observed, hence a lower limit on the half-life of in 76Ge has been set at T0/2 > 1.8 x 1026 years at 90% C.L.. The final results of the Gerda experiment are discussed.
Keywords: neutrinoless double beta decay, Majorana nature of neutrinos.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 359-362.
Study of Tau Neutrino Production in NA65 Experiment at CERN SPS
Yury Gornushkin (DsTau Collaboration) E-mail: gornushk@jinr.ru
Joint Institute for Nuclear Research, Jokiot-Curie 6, Dubna, 141980, Russia Received January 16, 2022
In the DsTau (NA65) experiment at CERN SPS, an independent and direct way to study a tau neutrino production in high energy proton-nucleous interactions was proposed. The experimental method is based on a use of high resolution emulsion detectors for effective registration of events with short lived particle decays. The motivation of the project, details of the experimental technique, and the first results of the analysis of the data collected during test runs are presented.
Keywords: tau neutrino, nuclear emulsion.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 363-364.
Prospects and Status of the JUNO Experiment
Cong Guo (On behalf of the JUNO Collaboration) E-mail: guocong@ihep.ac.cn
Institute of High Energy Physics, Chinese Academy of Science. Beijing, China Received January 16, 2022
The Jiangmen Underground Neutrino Observatory (JUNO) is a 20 kton liquid scintillator detector in a laboratory 700 m underground. An excellent energy resolution and a large fiducial volume offer exciting opportunities for addressing many important topics in neutrino and astro-particle physics. In this paper, the detector design, the physics prospects, and the subsystems of JUNO including the central detector, veto detector, calibration and JUNO-TAO will be introduced.
Keywords: neutrino, JUNO, physics prospects, detector design.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 365-368.
