Персона:
Белогуров, Сергей Геннадьевич

Научные группы

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.

Фамилия

Белогуров

Имя

Сергей Геннадьевич

Полная страница элемента

Результаты поиска

Теперь показываю 1 - 10 из 27

Только метаданные
Design and Performance of the ACCULINNA-2 Fragment-Separator
(2024) Krupko, S. A.; Belogurov, S. G.; Bezbakh, A. A.; Fomichev, A. S.; Grigorenko, L. V.; Белогуров, Сергей Геннадьевич; Григоренко, Леонид Валентинович
Только метаданные
Searches for new physics below twice the electron mass with GERDA
(2024) Agostini, M.; Alexander, A.; Araujo, G.; Belogurov, S.; Kornoukhov, V. N.; Белогуров, Сергей Геннадьевич; Корноухов, Василий Николаевич
A search for full energy depositions from bosonic keV-scale dark matter candidates of masses between 65 and 1021 keV has been performed with data collected during Phase II of the GERmanium Detector Array (Gerda) experiment. Our analysis includes direct dark matter absorption as well as dark Compton scattering. With a total exposure of 105.5 kg years, no evidence for a signal above the background has been observed. The resulting exclusion limits deduced with either Bayesian or Frequentist statistics are the most stringent direct constraints in the major part of the 140-1021 keV mass range. As an example, at a mass of 150 keV the dimensionless coupling of dark photons and axion-like particles to electrons has been constrained to
Только метаданные
Characterization of 30 Ge-76 enriched Broad Energy Ge detectors for GERDA Phase II
(2019) Agostini, M.; Bakalyarov, A. M.; Andreotti, E.; Balata, M.; Belogurov, S.; Белогуров, Сергей Геннадьевич
The GERmanium Detector Array (Gerda) is a low background experiment located at the Laboratori Nazionali del Gran Sasso in Italy, which searches for neutrinoless double-beta decay of 76Se+2e-. Gerda has been conceived in two phases. Phase II, which started in December 2015, features several novelties including 30 new Ge-76 enriched detectors. These were manufactured according to the Broad Energy Germanium (BEGe) detector design that has a better background discrimination capability and energy resolution compared to formerly widely-used types. Prior to their installation, the new BEGe detectors were mounted in vacuum cryostats and characterized in detail in the Hades underground laboratory in Belgium. This paper describes the properties and the overall performance of these detectors during operation in vacuum. The characterization campaign provided not only direct input for Gerda Phase II data collection and analyses, but also allowed to study detector phenomena, detector correlations as well as to test the accuracy of pulse shape simulation codes.
Открытый доступ
Measurement of the 85Kr specific activity in the GERDA liquid argon
(2025) Agostini, M.; Alexander, A.; Araujo, G.; Belogurov, S.; Kornoukhov, V. N.; Белогуров, Сергей Геннадьевич; Корноухов, Василий Николаевич
Только метаданные
Search for exotic physics in double-,Q decays with GERDA Phase II
(2022) Agostini, M.; Alexander, A.; Araujo, G.; Bakalyarov, A. M.; Belogurov, S.; Белогуров, Сергей Геннадьевич
A search for Beyond the Standard Model double-/3 decay modes of 76Ge has been performed with data collected during the Phase II of the GERmanium Detector Array (GERDA) experiment, located at the Laboratori Nazionali del Gran Sasso of INFN (Italy). Improved limits on the decays involving Majorons have been obtained, compared to previous experiments with 76Ge, with half-life values on the order of 1023 yr. For the first time with 76Ge, limits on Lorentz invariance violation effects in double-/3 decay have been obtained. The isotropic coefficient a(3) of , which embeds Lorentz violation in double-/3 decay, has been constrained at the order of 10-6 GeV. We also set the first experimental limits on the search for light exotic fermions in double-/3 decay, including sterile neutrinos.
Только метаданные
First Search for Bosonic Superweakly Interacting Massive Particles with Masses up to 1 MeV/c(2) with GERDA
(2020) Agostini, M.; Bakalyarov, A. M.; Balata, M.; Barabanov, I.; Belogurov, S.; Белогуров, Сергей Геннадьевич
We present the first search for bosonic superweakly interacting massive particles (super-WIMPs) as keV-scale dark matter candidates performed with the GERDA experiment. GERDA is a neutrinoless double-beta decay experiment which operates high-purity germanium detectors enriched in Ge-76 in an ultralow background environment at the Laboratori Nazionali del Gran Sasso (LNGS) of INFN in Italy. Searches were performed for pseudoscalar and vector particles in the mass region from 60 keV/c(2) to 1 MeV/c(2). No evidence for a dark matter signal was observed, and the most stringent constraints on the couplings of super-WIMPS with masses above 120 keV/c(2) have been set. As an example, at a mass of 150 keV/c(2) the most stringent direct limits on the dimensionless couplings of axionlike particles and dark photons to electrons of g(ae) < 3 x 10 -12 and alpha'/alpha < 6.5 x 10(-24) at 90% credible interval, respectively, were obtained.
Открытый доступ
Search for the in-situ production of 77Ge in the GERDA neutrinoless double-beta decay experiment
(2025) Agostini, M.; Alexander, A.; Araujo, G.; Belogurov, S.; Kornoukhov, V. N.; Белогуров, Сергей Геннадьевич; Корноухов, Василий Николаевич
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.]
Открытый доступ
Search for tri-nucleon decays of 76 Ge in GERDA
(2023) Agostini, M.; Alexander, A.; Araujo, G.; Bakalyarov, A. M.; Belogurov, S.; Kornoukhov, V. N.; Белогуров, Сергей Геннадьевич; Корноухов, Василий Николаевич
Только метаданные
Detection of the Low Energy Recoil 3He in the Reaction 2H(8He,3He)7H
(2020) Muzalevskii, I. A.; Chudoba, V.; Bezbakh, A. A.; Biare, D.; Belogurov, S. G.; Grigorenko, L. V.; Белогуров, Сергей Геннадьевич; Григоренко, Леонид Валентинович
© 2020, Allerton Press, Inc.Abstract: Investigation of the 7H-system in the experiment conducted at the fragment separator ACCULINNA-2 in the 8He(2H,3He)7H reaction requires to detect the recoil 3He ions with energy down to 6 MeV. For this purpose two ∆ E-E particle telescopes are used, with each telescope having in front a thin (20-μm) Si strip detector (∆E-SSD). The maps of thickness heterogeneity of the thin detectors were determined by measuring the energy losses of the 226Ra α-particles. The adopted thickness normalization method provides a good identification of the 3He nuclei being recorded in the presence of a high 4He background. Two approaches were used for calculating the energy losses of the identified 3He and 4He reaction ejectiles and reconstructing their energy values available at the exit from the deuterium target. The developed techniques were applied for the 7H missing-mass reconstruction.