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Полухина, Наталья Геннадьевна

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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 34

Только метаданные
Investigation of Dynamics of Heat Propagation in Meteorite Matter and Its Influence on Geometric Features of Tracks of Nuclei in Olivine Crystals from Meteorites
(2021) Soe, T. N.; Starkov, N. I.; Polukhina, N. G.; Полухина, Наталья Геннадьевна
© 2021, Pleiades Publishing, Ltd.Abstract: The dynamics of heating of a meteorite that travels through the Earth’s atmosphere is studied. The heating of its matter over the meteorite fall time is estimated by solving the heat-propagation equation. It is shown that the temperature of olivine crystals situated at a distance of 3 to 5 mm from the meteorite edge may reach 1200 to 1300C, and this may lead to the track-annealing effect. As a result, some tracks disappear, while some of them change their geometric features. This may explain an unusual shape of the charge distribution of nuclei found in olivine crystals situated near the meteorite edge.
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.
Только метаданные
The SHiP experiment at the proposed CERN SPS Beam Dump Facility
(2022) Ahdida, C.; Akmete, A.; Albanese, R.; Alt, J.; Atkin, E.; Dmitrenko, V.; Etenko, A.; Fillipov, K.; Grachev, V.; Kudenko, Y.; 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
© 2022, The Author(s).The Search for Hidden Particles (SHiP) Collaboration has proposed a general-purpose experimental facility operating in beam-dump mode at the CERN SPS accelerator to search for light, feebly interacting particles. In the baseline configuration, the SHiP experiment incorporates two complementary detectors. The upstream detector is designed for recoil signatures of light dark matter (LDM) scattering and for neutrino physics, in particular with tau neutrinos. It consists of a spectrometer magnet housing a layered detector system with high-density LDM/neutrino target plates, emulsion-film technology and electronic high-precision tracking. The total detector target mass amounts to about eight tonnes. The downstream detector system aims at measuring visible decays of feebly interacting particles to both fully reconstructed final states and to partially reconstructed final states with neutrinos, in a nearly background-free environment. The detector consists of a 50m long decay volume under vacuum followed by a spectrometer and particle identification system with a rectangular acceptance of 5 m in width and 10 m in height. Using the high-intensity beam of 400GeV protons, the experiment aims at profiting from the 4 × 10 19 protons per year that are currently unexploited at the SPS, over a period of 5–10 years. This allows probing dark photons, dark scalars and pseudo-scalars, and heavy neutral leptons with GeV-scale masses in the direct searches at sensitivities that largely exceed those of existing and projected experiments. The sensitivity to light dark matter through scattering reaches well below the dark matter relic density limits in the range from a few MeV/c2 up to 100 MeV-scale masses, and it will be possible to study tau neutrino interactions with unprecedented statistics. This paper describes the SHiP experiment baseline setup and the detector systems, together with performance results from prototypes in test beams, as it was prepared for the 2020 Update of the European Strategy for Particle Physics. The expected detector performance from simulation is summarised at the end.
Только метаданные
Search for weakly interacting massive dark matter particles: state of the art and prospects
(2021) Aleksandrov, A. B.; Dashkina, A. B.; Konovalova, N. S.; Okat'eva, N. M.; Polukhina, N. G.; Полухина, Наталья Геннадьевна
Determining the nature of dark matter (DM) is one of the most important challenges of modern experimental physics. This article overviews the major arguments confirming the existence of DM, gives the latest classifications of DM particles, identifies possible candidates for their role, and discusses the most significant DM particle search experiments conducted and under development. The article mainly aims to give an idea of diverse experimental methods of and approaches to registering DM particles, as well as of the currently available results of the search for them, which open new prospects in DM studies and contribute to solving topical problems in New Physics.
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
The magnet of the scattering and neutrino detector for the SHiP experiment at CERN
(2020) Ahdida, C.; Albanese, R.; Alexandrov, A.; Anokhina, A.; Atkin, E.; Dmitrenko, V.; Etenko, A.; Filippov, K.; Gavrilov, G.; 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
© 2020 CERN. Published by IOP Publishing Ltd on behalf of Sissa Medialab. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.The Search for Hidden Particles (SHiP) experiment proposal at CERN demands a dedicated dipole magnet for its scattering and neutrino detector. This requires a very large volume to be uniformly magnetized at B > 1.2 T, with constraints regarding the inner instrumented volume as well as the external region, where no massive structures are allowed and only an extremely low stray field is admitted. In this paper we report the main technical challenges and the relevant design options providing a comprehensive design for the magnet of the SHiP Scattering and Neutrino Detector.
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
Estimation of the Fragmentation Effect in the Registration of Superheavy Nuclei of Galactic Cosmic Rays in Pallasites
(2022) Babaev, P. A.; Bagulya, A. V.; Volkov, A. E.; Gorbunov, S. A.; Polukhina, N. G.; Полухина, Наталья Геннадьевна
© 2022, Pleiades Publishing, Inc.Abstract: We report on the results of model calculations for estimating the fragmentation effect in the registration of heavy and superheavy nuclei of galactic cosmic rays in olivine crystals from pallasite at the Marjalahti and Eagle Station. The measurement of fluxes and spectra of heavy and superheavy nuclei in cosmic rays is a sensitive method for studying the composition and possible sources of cosmic rays, the processes occurring in the sources themselves and in the interstellar medium, and forms the basis for constructing models of cosmic ray confinement in the Galaxy. The database obtained in the OLIMPIYA experiment, which includes characteristics of 21743 tracks, is the largest database for charges Z > 55 at present. The estimates of fragmentation of nuclei in pallasites, which have been obtained based on model calculations, show that the effect of this process on the resulting charge spectrum is insignificant.
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
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)%.