Персона:
Белогуров, Сергей Геннадьевич

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Научная группа

Организационные подразделения

Организационная единица

Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.

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Белогуров

Имя

Сергей Геннадьевич

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Теперь показываю 1 - 10 из 27

Только метаданные
Final Results of GERDA on the Search for Neutrinoless Double-beta Decay
(2020) Agostini, M.; Araujo, G. R.; Bakalyarov, A. M.; Balata, M.; Belogurov, S.; Белогуров, Сергей Геннадьевич
The GERmanium Detector Array (GERDA) experiment searched for the lepton-number-violating neutrinoless double-beta (0 nu beta beta) decay of Ge-76, whose discovery would have far-reaching implications in cosmology and particle physics. By operating bare germanium diodes, enriched in Ge-76, in an active liquid argon shield, GERDA achieved an unprecedently low background index of 5.2 x 10(-4) counts/(keV kg yr) in the signal region and met the design goal to collect an exposure of 100 kg yr in a background-free regime. When combined with the result of Phase I, no signal is observed after 127.2 kg yr of total exposure. A limit on the half-life of 0 nu beta beta decay in Ge-76 is set at T-1/2 > 1.8 x 10(26) yr at 90% C.L., which coincides with the sensitivity assuming no signal.
Только метаданные
An improved limit on the neutrinoless double-electron capture of 36 Ar with GERDA
(2024) Agostini, M.; Alexander, A.; Araujo, G. R.; Bakalyarov, A. M.; Belogurov, S.; Kornoukhov, V. N.; Белогуров, Сергей Геннадьевич; Корноухов, Василий Николаевич
Только метаданные
Study of 10Li Low Energy Spectrum in the 2H(9Li, p) Reaction
(2020) Bezbakh, A. A.; Biare, D.; Chudoba, V.; Fomichev, A. S.; Belogurov, S. G.; Белогуров, Сергей Геннадьевич
© 2020, Allerton Press, Inc.Abstract: The one-neutron transfer 2H(9Li, p)10Li reaction has been investigated at 29 A MeV incident energy at the ACCULINNA-2 facility (Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research). The setup has been used in order to detect the recoil protons at backward angles in coincidences with the outgoing 9Li and neutrons from the 10Li decay at forward angles. This setup allows to study the 10Li emitted in the crucial region at forward angles in the center of mass. The preliminary results in the part of the analysis of double proton–9Li coincidence are reported.
Только метаданные
Pulse shape analysis in GERDA Phase II
(2022) Agostini, M.; Araujo, G.; Bakalyarov, A. M.; Balata, M.; Belogurov, S.; Белогуров, Сергей Геннадьевич
The GERmanium Detector Array (GERDA) collaboration searched for neutrinoless double-beta decay in Ge-76 using isotopically enriched high purity germanium detectors at the Laboratori Nazionali del Gran Sasso of INFN. After Phase I (2011-2013), the experiment benefited from several upgrades, including an additional active veto based on LAr instrumentation and a significant increase of mass by point-contact germanium detectors that improved the halflife sensitivity of Phase II (2015-2019) by an order of magnitude. At the core of the background mitigation strategy, the analysis of the time profile of individual pulses provides a powerful topological discrimination of signal-like and background-like events. Data from regular Th-228 calibrations and physics data were both considered in the evaluation of the pulse shape discrimination performance. In this work, we describe the various methods applied to the data collected in GERDA Phase II corresponding to an exposure of 103.7 kg year. These methods suppress the background by a factor of about 5 in the region of interest around Q(beta beta) = 2039 keV, while preserving (81 +/- 3)% of the signal. In addition, an exhaustive list of parameters is provided which were used in the final data analysis.
Только метаданные
Resonant states in H 7: Experimental studies of the H 2 (He 8, He 3) reaction
(2021) Muzalevskii, I. A.; Bezbakh, A. A.; Nikolskii, E. Yu.; Chudoba, V.; Belogurov, S. G.; Grigorenko, L. V.; Белогуров, Сергей Геннадьевич; Григоренко, Леонид Валентинович
© 2021 American Physical Society.The extremely neutron-rich system H7 was studied in the direct H2(He8,He3)H7 transfer reaction with a 26 AMeV secondary He8 beam [Bezbakh et al., Phys. Rev. Lett. 124, 022502 (2020)PRLTAO0031-900710.1103/PhysRevLett.124.022502]. The missing mass spectrum and center-of-mass angular distributions of H7, as well as the momentum distribution of the H3 fragment in the H7 frame, were constructed. In addition, we carried out another experiment with the same beam but a modified setup, which was cross-checked by the study of the H2(Be10,He3)Li9 reaction. A solid experimental evidence is provided that two resonant states of H7 are located in its spectrum at 2.2(5) and 5.5(3)MeV relative to the H3+4n decay threshold. Also, there are indications that the resonant states at 7.5(3) and 11.0(3)MeV are present in the measured H7 spectrum. Based on the energy and angular distributions, obtained for the studied H2(He8,He3)H7 reaction, the weakly populated 2.2(5)-MeV peak is ascribed to the H7 ground state. It is highly plausible that the firmly ascertained 5.5(3)-MeV state is the 5/2+ member of the H7 excitation 5/2+-3/2+ doublet, built on the 2+ configuration of valence neutrons. The supposed 7.5-MeV state can be another member of this doublet, which could not be resolved in Bezbakh et al. [Phys. Rev. Lett. 124, 022502 (2020)PRLTAO0031-900710.1103/PhysRevLett.124.022502]. Consequently, the two doublet members appeared in the spectrum of H7 in the work mentioned above as a single broad 6.5-MeV peak.
Только метаданные
Modeling of GERDA Phase II data
(2020) Agostini, M.; Bakalyarov, A. M.; Balata, M.; Barabanov, I.; Belogurov, S.; Белогуров, Сергей Геннадьевич
© 2020, The Author(s).The GERmanium Detector Array (Gerda) experiment at the Gran Sasso underground laboratory (LNGS) of INFN is searching for neutrinoless double-beta (0νββ) decay of 76Ge. The technological challenge of Gerda is to operate in a “background-free” regime in the region of interest (ROI) after analysis cuts for the full 100 kg·yr target exposure of the experiment. A careful modeling and decomposition of the full-range energy spectrum is essential to predict the shape and composition of events in the ROI around Qββ for the 0νββ search, to extract a precise measurement of the half-life of the double-beta decay mode with neutrinos (2νββ) and in order to identify the location of residual impurities. The latter will permit future experiments to build strategies in order to further lower the background and achieve even better sensitivities. In this article the background decomposition prior to analysis cuts is presented for Gerda Phase II. The background model fit yields a flat spectrum in the ROI with a background index (BI) of 16.04−0.85+0.78·10−3 cts/(keV·kg·yr) for the enriched BEGe data set and 14.68−0.52+0.47·10−3 cts/(keV·kg·yr) for the enriched coaxial data set. These values are similar to the one of Phase I despite a much larger number of detectors and hence radioactive hardware components. [Figure not available: see fulltext.]
Только метаданные
Calibration of the Gerda experiment
(2021) Agostini, M.; Araujo, G.; Bakalyarov, A. M.; Balata, M.; Belogurov, S.; Белогуров, Сергей Геннадьевич
© 2021, The Author(s).The GERmanium Detector Array (Gerda) collaboration searched for neutrinoless double-β decay in 76Ge with an array of about 40 high-purity isotopically-enriched germanium detectors. The experimental signature of the decay is a monoenergetic signal at Qββ= 2039.061 (7) keV in the measured summed energy spectrum of the two emitted electrons. Both the energy reconstruction and resolution of the germanium detectors are crucial to separate a potential signal from various backgrounds, such as neutrino-accompanied double-β decays allowed by the Standard Model. The energy resolution and stability were determined and monitored as a function of time using data from regular 228Th calibrations. In this work, we describe the calibration process and associated data analysis of the full Gerda dataset, tailored to preserve the excellent resolution of the individual germanium detectors when combining data over several years.
Только метаданные
Final Results of GERDA on the Two-Neutrino Double- β Decay Half-Life of Ge 76
(2023) Agostini, M.; Alexander, A.; Araujo, G. R.; Bakalyarov, A. M.; Belogurov, S.; Kornoukhov, V. N.; Белогуров, Сергей Геннадьевич; Корноухов, Василий Николаевич
Только метаданные
The First Experiments with the New ACCULINNA-2 Fragment Separator
(2019) Fomichev, A. S.; Bezbakh, A. A.; Wolski, R.; Gazeeva, E. M.; Belogurov, S. G.; Grigorenko, L. V.; Белогуров, Сергей Геннадьевич; Григоренко, Леонид Валентинович
© 2019, Allerton Press, Inc.Abstract: Characteristics of a new separator of radioactive ion beams (RIBs) are described. It was recently commissioned at the Flerov Laboratory of Nuclear Reactions (FLNR JINR) and is in operation at the primary beam line of the U-400M heavy ion cyclotron providing RIBs in energy range of 10–50 MeV/nucleon. Preliminary results obtained in the first experiments performed with this separator in 2018 are presented. A medium-term program of scientific research is discussed.
Только метаданные
Observation of a positive-parity wave in the low-energy spectrum of He 7
(2024) Golovkov, M. S.; Bezbakh, A. A.; Denikin, A. S.; Wolski, R.; Belogurov, S.; Белогуров, Сергей Геннадьевич