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Полухина, Наталья Геннадьевна

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Научная группа

Организационные подразделения

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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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Полухина

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Наталья Геннадьевна

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Теперь показываю 1 - 10 из 33

Только метаданные
Anomaly of the Charge Spectrum of Galactic Cosmic Ray Nuclei in Olivines as Evidence of Meteorite Radiation History
(2020) Alexandrov, A. B.; Bagulya, A. V.; Volkov, A. E.; Gippius, A. A.; Grachev, V. M.; Polukhina, N. G.; Грачев, Виктор Михайлович; Полухина, Наталья Геннадьевна
© 2020, Allerton Press, Inc.Abstract: A new additional aspect of the analysis of the data of the OLYMPIA experiment on the search for nuclei of heavy cosmic ray components in olivine crystals from stony—iron meteorites is presented. Two groups of crystals with different charge spectra of recorded nuclei are detected. Possible causes of this phenomenon and its effect on the final spectrum are discussed.
Только метаданные
First observation of a tau neutrino charged current interaction with charm production in the OPERA experiment: OPERA Collaboration
(2020) Agafonova, N.; Aleksandrov, A.; Anokhina, A.; Aoki, S.; Polukhina, N.; Полухина, Наталья Геннадьевна
© 2020, The Author(s).An event topology with two secondary vertices compatible with the decay of short-lived particles was found in the analysis of neutrino interactions in the OPERA target. The observed topology is compatible with tau neutrino charged current (CC) interactions with charm production and neutrino neutral current (NC) interactions with cc¯ pair production. However, other processes can mimic this topology. A dedicated analysis was implemented to identify the underlying process. A Monte Carlo simulation was developed and complementary procedures were introduced in the kinematic reconstruction. A multivariate analysis technique was used to achieve an optimal separation of signal from background. Most likely, this event is a ντ CC interaction with charm production, the tau and charm particle decaying into 1 prong and 2 prongs, respectively. The significance of this observation is evaluated.
Только метаданные
A Noninvasive Muonography-Based Method for Exploration of Cultural Heritage Objects
(2022) Alexandrov, A. B.; Vasina, S. G.; Galkin, V. I.; Gippius, A. A.; Grachev, V. M.; Kalinina, V. G.; Konovalov, A. S.; Konovalova, N. S.; Korolev, P. S.; Larionov, A. A.; Managadze, A. K.; Melnichenko, I. A.; Okateva, N. M.; Polukhina, N. G.; Roganova, T. M.; Sadykov, Zh. T.; Starkov, N. I.; Starkova, E. N.; Tyukov, V. E.; Chernyavsky, M. M.; Shevchenko, V. I.; Shchedrina, T. V.; Шевченко, Владимир Игоревич; Ларионов, Алексей Александрович; Полухина, Наталья Геннадьевна
An innovative noninvasive method of muonography based on emulsion detectors has been developed. The new method enables detection of changes in the fluxes of atmospheric muons passing through the object under study and determination of the specific features of its internal structure. Owing to the use of the state-of-the-art automated scanning facilities, large-scale studies of natural and industrial objects can be carried out that require processing of large quantity of photoemulsion. A major muonography experiment, in which the internal structure of buildings and the territory of the Svyato-Troitsky Danilov Monastery had been examined, is described in detail.
Только метаданные
High resolution track matching in a hybrid SciFi-emulsion detector
(2022) Chernyavskiy, M. M.; Gippius, A. A.; Konovalova, N. S.; Malinin, A. G.; Okateva, N. M.; Petrov, A. N.; Polukhina, N. G.; Shevchenko, V. I.; Shchedrina, T. V.; Starkova, E. N.; Starkov, N. I.; Шевченко, Владимир Игоревич; Полухина, Наталья Геннадьевна
IOP Publishing Ltd and Sissa Medialab.The paper describes the matching of tracks in a nuclear emulsion detector interleaved with scintillating optical fiber (SciFi) planes. This technology is planned to be used in the Scattering and Neutrino Detector (SND) of the new experiment SHiP (Search for Hidden Particles) being developed in CERN. The experiment SHiP aimed on the search of very weakly interacting particles in the poorly studied region of the particle masses below 10 GeV will be installed in a beam dump facility at the Super Proton Synchrotron (SPS). The SND detector is aimed to provide temporal and spatial analysis of the particle showers and isolated tracks to separate and reconstruct events in nuclear emulsion. SND design includes emulsion cloud chamber (ECC) and SciFi tracker. Motivation for using the combination of ECC and SciFi is to obtain the "real-time"information for the prompt and high-accuracy event analysis. The algorithm presented in the article provides a track matching accuracy not less than 50 μm with an efficiency of (89±8)%.
Только метаданные
Final results on neutrino oscillation parameters from the OPERA experiment in the CNGS beam
(2019) Agafonova, N.; Alexandrov, A.; Anokhina, A.; Aoki, S.; Polukhina, N.; Полухина, Наталья Геннадьевна
The OPERA experiment has conclusively observed the appearance of tau neutrinos in the muon neutrino CNGS beam. Exploiting the OPERA detector capabilities, it was possible to isolate high purity samples of nu(e), nu(mu), and nu(tau) charged current weak neutrino interactions, as well as neutral current weak interactions. In this paper, the full dataset is used for the first time to test the three-flavor neutrino oscillation model and to derive constraints on the existence of a light sterile neutrino within the framework of the 3 + 1 neutrino model. For the first time, tau and electron neutrino appearance channels are jointly used to test the sterile neutrino hypothesis. A significant fraction of the sterile neutrino parameter space allowed by LSND and MiniBooNE experiments is excluded at 90% C.L. In particular, the best-fit values obtained by MiniBooNE combining neutrino and antineutrino data are excluded at 3.3 sigma significance.
Только метаданные
Study of the Pallasite Radiation History by Track Analysis
(2019) Alexeev, V. A.; Bagulya, A. V.; Volkov, A. E.; Gippius, A. A.; Grachev, V. M.; Polukhina, N. G.; Грачев, Виктор Михайлович; Полухина, Наталья Геннадьевна
This work was performed within the OLYMPIA experiment on the study of tracks of heavy and superheavy cosmic ray nuclei in olivine crystals from Marjalahti and Eagle Station pallasites. Depth distributions of the track formation rate for heavy cosmic ray nuclei in olivine crystals from pallasites of different pre-atmospheric sizes were obtained. The dependences obtained were used to analyze the data on the track density in olivine crystals from the Marjalahti pallasite. In three crystals, the track distribution with a high density gradient was detected, which indicates a complicated radiation history of the meteorite.
Только метаданные
Muonography of Large Natural and Industrial Objects
(2019) Abiev, A. K.; Bagulya, A. V.; Chernyavsky, M. M.; Dimitrienko, A. A.; Grachev, V. M.; Polukhina, N. G.; Грачев, Виктор Михайлович; Полухина, Наталья Геннадьевна
© 2019, Pleiades Publishing, Ltd.Cosmic ray muonography is a novel technique for imaging of the internal structures of large natural and industrial objects. It exploits the capability of high energy muons from cosmic rays to penetrate large thicknesses of large subjects to be studied, in order to obtain a density map. It uses muon flux attenuation and absorption in materials of investigated objects. Nuclear emulsions are tracking detectors well suited to be employed in muonography for investigations of inner structure of large objects up to kilometers size, since emulsions have firstly an excellent angular resolution, they are compact and robust, do not require power supply. The muonography methods are applied to study one of UNESCO world heritage objects, the unusual building in the Naryn-Kala citadel hidden underground. The use of nuclear emulsions as probing radiation detectors provides for a uniquely high resolution capacity of recording instrumentation combined with the potential of modern image analysis methods giving 3D reconstruction of the internal structures of the investigated object.
Только метаданные
Determination of Charges of Superheavy Nuclei in Finding them in Nature
(2019) Aleksandrov, A. B.; Alekseev, V. A.; Bagulya, A. V.; Dashkina, A. B.; Grachev, V. M.; Polukhina, N. G.; Грачев, Виктор Михайлович; Полухина, Наталья Геннадьевна
© 2019, Allerton Press, Inc.The results of the search for tracks of heavy and superheavy nuclei of galactic cosmic rays in the charge range Z = 26 − 129, identified in olivine crystals from Maryalahti and Eagle Station meteorites are presented. The database including characteristics of 21743 tracks, obtained in the OLIMPIA experiment, is currently the largest one within the charge range under study. It includes three tracks of superheavy nuclei with charge 119−6 +10 and a minimum lifetime estimated as several tens of years, which can be considered as a direct experimental validation of the existence of natural superheavy nuclei from the “stability island”.
Только метаданные
Sensitivity of the SHiP experiment to light dark matter
(2021) Ahdida, C.; Akmete, A.; Albanese, R.; Alexandrov, A.; Atkin, E.; Dmitrenko, V.; Etenko, A.; Filippov, K.; Grachev, V.; Kudenko, Y.; Novikov, A.; Polukhina, N.; Samsonov, V.; Shustov, A.; Skorokhvatov, M.; Smirnov, S.; Teterin, P.; Ulin, S.; Uteshev, Z.; Vlasik, K.; Аткин, Эдуард Викторович; Дмитренко, Валерий Васильевич; Этенко, Александр Владимирович; Грачев, Виктор Михайлович; Куденко, Юрий Григорьевич; Полухина, Наталья Геннадьевна; Шустов, Александр Евгеньевич; Скорохватов, Михаил Дмитриевич; Смирнов, Сергей Юрьевич; Тетерин, Пётр Евгеньевич; Улин, Сергей Евгеньевич; Утешев, Зияэтдин Мухамедович; Власик, Константин Федорович
© 2021, The Author(s).Dark matter is a well-established theoretical addition to the Standard Model supported by many observations in modern astrophysics and cosmology. In this context, the existence of weakly interacting massive particles represents an appealing solution to the observed thermal relic in the Universe. Indeed, a large experimental campaign is ongoing for the detection of such particles in the sub-GeV mass range. Adopting the benchmark scenario for light dark matter particles produced in the decay of a dark photon, with αD = 0.1 and mA′ = 3mχ, we study the potential of the SHiP experiment to detect such elusive particles through its Scattering and Neutrino detector (SND). In its 5-years run, corresponding to 2 · 1020 protons on target from the CERN SPS, we find that SHiP will improve the current limits in the mass range for the dark matter from about 1 MeV to 300 MeV. In particular, we show that SHiP will probe the thermal target for Majorana candidates in most of this mass window and even reach the Pseudo-Dirac thermal relic. [Figure not available: see fulltext.]
Только метаданные
Algorithm for Determining the Thickness of the Cut Olivine Layer when Determining Charges of Galactic Nuclei
(2021) Soe, T. N.; Starkov, N. I.; Polukhina, N. G.; Полухина, Наталья Геннадьевна
© 2021, Allerton Press, Inc.Abstract: An algorithm for determining the thickness of the olivine layer cut when determining charges of galactic nuclei from meteorites is presented. The calculation results related to the intersection points of nuclei trajectory projections on the crystal surface at different stages are presented. It is shown that the mechanism is valid to control cut operations when searching for traces of galactic nuclei in olivines from meteorites with good accuracy.