Персона:
Белогуров, Сергей Геннадьевич

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Научная группа

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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

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Сергей Геннадьевич

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Теперь показываю 1 - 10 из 27

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
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
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
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
Evidence for the First Excited State of H 7
(2020) Bezbakh, A. A.; Chudoba, V.; Krupko, S. A.; Biare, D.; Belogurov, S. G.; Grigorenko, L. V.; Белогуров, Сергей Геннадьевич; Григоренко, Леонид Валентинович
© 2020 American Physical Society.The H7 system was populated in the H2(He8,He3)H7 reaction with a 26 AMeV He8 beam. The H7 missing mass energy spectrum, the H3 energy and angular distributions in the H7 decay frame were reconstructed. The H7 missing mass spectrum shows a peak, which can be interpreted either as unresolved 5/2+ and 3/2+ doublet or one of these states at 6.5(5) MeV. The data also provide indications of the 1/2+ ground state of H7 located at 1.8(5) MeV with quite a low population cross section of ∼25 μb/sr within angular range θc.m.≃(17°-27°).
Только метаданные
H 6 states studied in the H 2 (He 8, He 4) reaction and evidence of an extremely correlated character of the H 5 ground state
(2022) Nikolskii, E. Yu.; Muzalevskii, I. A.; Bezbakh, A. A.; Chudoba, V.; Belogurov, S. G.; Grigorenko, L. V.; Белогуров, Сергей Геннадьевич; Григоренко, Леонид Валентинович
© 2022 American Physical Society.The extremely neutron-rich system H6 was studied in the direct H2(He8,He4)H6 transfer reaction with a 26A MeV secondary He8 beam. The measured missing mass spectrum shows a broad bump at ≈4-8 MeV above the H3+3n decay threshold. This bump can be interpreted as a broad resonant state in H6 at 6.8(5) MeV. The population cross section of such a presumably p-wave state (or it may be few overlapping states) in the energy range from 4 to 8 MeV is dσ/dωc.m.≃190-80+40μb/sr in the angular range 5°<θc.m.<16°. The obtained missing mass spectrum is practically free of H6 events below 3.5 MeV (dσ/dωc.m. 5μb/sr in the same angular range). The steep rise of the H6 missing mass spectrum at ≈3 MeV allows us to derive the lower limit for the possible resonant-state energy in H6 to be 4.5(3) MeV. According to the paring energy estimates, such a 4.5(3) MeV resonance is a realistic candidate for the H6 ground state (g.s.). The obtained results confirm that the decay mechanism of the H7 g.s. (located at 2.2 MeV above the H3+4n threshold) is the "true"(or simultaneous) 4n emission. The resonance energy profiles and the momentum distributions of fragments of the sequential H6→H5(g.s.)+n→H3+3n decay were analyzed by the theoretically updated direct four-body-decay and sequential-emission mechanisms. The measured momentum distributions of the H3 fragments in the H6 rest frame indicate very strong "dineutron-type"correlations in the H5 ground state decay.
Только метаданные
Study of Proton and Deuteron Pickup Reactions and with 44 MeV Be Radioactive Beam at ACCULINNA-2 Fragment Separator
(2023) Nikolskii, E. Y.; Krupko, S. A.; Muzalevskii, I. A.; Bezbakh, A. A.; Belogurov, S. G.; Grigorenko, L. V.; Белогуров, Сергей Геннадьевич; Григоренко, Леонид Валентинович
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
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
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.