Персона: Майоров, Андрей Георгиевич
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Институт ядерной физики и технологий
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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- ПубликацияТолько метаданныеHelium Fluxes Measured by the PAMELA Experiment from the Minimum to the Maximum Solar Activity for Solar Cycle 24(2022) Marcelli, N.; Boezio, M.; Lenni, A.; Menn, W.; Galper, A. M.; Koldashov, S. V.; Koldobskiy, S.; Leonov, A. A.; Malakhov, V. V.; Mayorov, A. G.; Mikhailov, V. V.; Spillantini, P.; Voronov, S. A.; Yurkin, Y. T.; Колдобский, Сергей Александрович; Леонов, Алексей Анатольевич; Малахов, Виталий Валерьевич; Майоров, Андрей Георгиевич; Михайлов, Владимир Владимирович; Воронов, Сергей Александрович; Юркин, Юрий Тихонович© 2022. The Author(s). Published by the American Astronomical Society..Time-dependent energy spectra of galactic cosmic rays (GCRs) carry fundamental information regarding their origin and propagation. When observed at the Earth, these spectra are significantly affected by the solar wind and the embedded solar magnetic field that permeates the heliosphere, changing significantly over an 11 yr solar cycle. Energy spectra of GCRs measured during different epochs of solar activity provide crucial information for a thorough understanding of solar and heliospheric phenomena. The PAMELA experiment collected data for almost 10 years (2006 June 15-2016 January 23), including the minimum phase of solar cycle 23 and the maximum phase of solar cycle 24. In this paper, we present new spectra for helium nuclei measured by the PAMELA instrument from 2010 January to 2014 September over a three-Carrington-rotation time basis. These data are compared to the PAMELA spectra measured during the previous solar minimum, providing a picture of the time dependence of the helium-nuclei fluxes over a nearly full solar cycle. Time and rigidity dependencies are observed in the proton-to-helium flux ratios. The force-field approximation of the solar modulation was used to relate these dependencies to the shapes of the local interstellar proton and helium-nuclei spectra.
- ПубликацияТолько метаданныеAntiprotons in Сosmic Rays(2021) Alekseev, V. V.; Mayorov, A. G.; Epifanov, A. A.; Malakhov, V. V.; Rodenko, S. A.; Yulbarisov, R. F.; Майоров, Андрей Георгиевич; Малахов, Виталий Валерьевич; Роденко, Светлана Александровна; Юлбарисов, Рустам Фаритович© 2021, Pleiades Publishing, Ltd.Abstract: In this paper, we present an overview of antiproton fluxes measured in modern spectrometer-type experiments PAMELA (2006–2016) and AMS-02 (2011–present). These experiments provided important data on the fluxes of antiprotons of galactic origin and contributed towards the discovery of secondary antiprotons in the near-Earth space. We discuss the impact of the scientific discovery made in the PAMELA experiment as well as the confirmation of these results in the AMS-02 experiment, which was done with high statistical accuracy and additional extension of measurements into the high energy region. An outline of the existing theoretical models that attempt to describe the newly obtained spectra by introducing additional sources of galactic antiprotons is provided.
- ПубликацияТолько метаданныеStudying 27-Day Variations in the GCR Flux, Based on PAMELA Measurements(2019) Modzelewska, R.; Troitskaya, I. K.; Mayorov, A. G.; Malakhov, V. V.; Rodenko, S. A.; Майоров, Андрей Георгиевич; Малахов, Виталий Валерьевич; Роденко, Светлана Александровна© 2019, Allerton Press, Inc.Abstract: The PAMELA and ARINA spectrometers installed on board the Resurs-DK1 spacecraft measure different components of the cosmic ray flux in a broad range of energies, including the interval from 30 MeV to tens of GeV, with high resolution during the period of June, 2006, to January, 2016. The results from these measurements allow us to obtain new information on the characteristics of variations in Galactic cosmic rays (GCRs), including their period, amplitude, and dependence on particle energy. This work presents the first preliminary results of this investigation, obtained via wavelet analysis of a temporal series of proton and helium nucleus fluxes.
- ПубликацияТолько метаданныеStudy of Forbush Decrease Recovery Times by the Payload for Antimatter Matter Exploration and Light-Nuclei Astrophysics (PAMELA) Experiment(2023) Lagoida, I. A.; Voronov, S. A.; Mikhailov, V. V.; Galper, A. M.; Leonov, A. N.; Malakhov, V.; Mayorov, A.; Yurkin, Y. T.; Лагойда, Илья Алексеевич; Воронов, Сергей Александрович; Михайлов, Владимир Владимирович; Леонов, Алексей Анатольевич; Малахов, Виталий Валерьевич; Майоров, Андрей Георгиевич; Юркин, Юрий Тихонович
- ПубликацияТолько метаданныеQuantum-mechanical numerical model of interaction between dark atom and nucleus of substance(2024) Bikbaev, T. E.; Khlopov, M. Yu.; Mayorov, A. G.; Хлопов, Максим Юрьевич; Майоров, Андрей Георгиевич
- ПубликацияТолько метаданныеEast-West Proton Flux Anisotropy Observed with the PAMELA Mission(2021) Bruno, A.; Martucci, M.; Cafagna, F. S.; Sparvoli, R.; Galper, A. M.; Koldashov, S. V.; Koldobskiy, S.; Leonov, A. A.; Malakhov, V. V.; Mayorov, A. G.; Mikhailov, V. V.; Spillantini, P.; Voronov, S. A.; Yurkin, Y. T.; Колдобский, Сергей Александрович; Леонов, Алексей Анатольевич; Малахов, Виталий Валерьевич; Майоров, Андрей Георгиевич; Михайлов, Владимир Владимирович; Воронов, Сергей Александрович; Юркин, Юрий Тихонович© 2021. The American Astronomical Society. All rights reserved..We present a study of the east-west anisotropy of trapped-proton fluxes in low-Earth orbit based on the measurements of the Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics (PAMELA) experiment. The differential intensities of eastward- and westward-traveling protons detected in the South Atlantic Anomaly region were estimated as a function of equatorial pitch angle and drift shell, for six energy bins between 80 MeV and 2 GeV. We found that, as a consequence of the strong atmospheric gradient coupled with the large gyroradius in this energy range, the intensities of eastward fluxes exceed those of westward fluxes by a factor of ∼10-20. However, the reported directional asymmetry also depends on the sign of the local flux gradient, resulting in more intense westward fluxes beyond the radial distances where the inner belt peaks. PAMELA observations can be used to improve the description of the near-Earth radiation environment at lowest altitudes and highest trapping energies, where current theoretical and empirical models are affected by the largest uncertainties.
- ПубликацияТолько метаданныеCosmic Rays’ Evolution in GT Simulation Package. Magnetosphere(2025) Galikyan, N. H.; Kruchinin, P. A.; Dyagilev, A. R.; Mayorov, A. G.; Malakhov, V. V.; Proshin, S. A.; Yulbarisov, R. F.; Галикян, Норайр Грачьяевич; Кручинин, Павел Алексеевич; Дягилев, Андрей Русланович; Майоров, Андрей Георгиевич; Малахов, Виталий Валерьевич; Прошин, Сергей Алексеевич; Юлбарисов, Рустам Фаритович
- ПубликацияТолько метаданныеThe Cross Section of the Inelastic Interaction of Protons with the Tungsten Obtained with the PAMELA Space Experiment(2019) Golub, O. A.; Mayorov, A. G.; Koldobskiy, S.; Malakhov, V.; Yulbarisov, R. F.; Голуб, Ольга Александровна; Майоров, Андрей Георгиевич; Колдобский, Сергей Александрович; Малахов, Виталий Валерьевич; Юлбарисов, Рустам Фаритович© 2019, Pleiades Publishing, Ltd.We present the energy dependence of the cross section for the inelastic interaction of protons with tungsten in the energy range from an order of 1 to hundred GeV using the data of the PAMELA space experiment. It was intended for the precision measurements of the cosmic ray fluxes of different nature and include a set of detectors for the reliable determination of the particle characteristics. We present the comparison of the obtained results with the measurements at accelerators and with existing theoretical models. The results of the work can be demanded for the development of numerical models describing particles’ interactions.
- ПубликацияТолько метаданныеDark Atoms of Nuclear Interacting Dark Matter(2024) Beylin, V. A.; Bikbaev, T.; Khlopov, M. Yu.; Mayorov, A. G.; Sopin, D. O.; Хлопов, Максим Юрьевич; Майоров, Андрей ГеоргиевичThe lack of positive evidence for Weakly Interacting Massive Particles (WIMPs) as well as the lack of discovery of supersymmetric (SUSY) particles at the LHC may appeal to a non-supersymmetric solution for the Standard Model problem of the Higgs boson mass divergence, the origin of the electroweak energy scale and the physical nature of the cosmological dark matter in the approach of composite Higgs boson. If the Higgs boson consists of charged constituents, their binding can lead to stable particles with electroweak charges. Such particles can take part in sphaleron transitions in the early Universe, which balance their excess with baryon asymmetry. Constraints on exotic charged species leave only stable particles with charge ў??2n possible, which can bind with n nuclei of primordial helium in neutral dark atoms. The predicted ratio of densities of dark atoms and baryonic matter determines the condition for dark atoms to dominate in the cosmological dark matter. To satisfy this condition of the dark-atom nature of the observed dark matter, the mass of new stable ў??2n charged particles should be within reach of the LHC for their searches. We discuss the possibilities of dark-atom binding in multi-atom systems and present state-of-the-art quantum mechanical descriptions of dark-atom interactions with nuclei. Annual modulations in such interactions with nuclei of underground detectors can explain the positive results of DAMA/NaI and DAMA/LIBRA experiments and the negative results of the underground WIMP searches.
- ПубликацияТолько метаданныеCosmic ray electron and positron spectrum with the PAMELA experiment(2019) Adriani, O.; Barbarino, G.; Bazilevskaya, G. A.; Bellotti, R.; Mikhailov, V. V.; Galper, A. M.; Karelin, A. V.; Koldashov, S. V.; Koldobskiy, S. A.; Leonov, A. A.; Malakhov, V. V.; Mayorov, A. G.; Spillantini, P.; Voronov, S. A.; Yurkin, Yu. T.; Михайлов, Владимир Владимирович; Колдобский, Сергей Александрович; Леонов, Алексей Анатольевич; Малахов, Виталий Валерьевич; Майоров, Андрей Георгиевич; Воронов, Сергей Александрович; Юркин, Юрий Тихонович© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).The PAMELA magnetic spectrometer, located on board the Resurs-DK1 satellite on Earth polar orbit with altitude of 350-600 km, measured the fluxes of cosmic ray particles and antiparticles in a wide energy range from 50 MeV to several TeVs. In this paper new results on the "all-electron" (sum electrons and positrons) spectrum are presented. New improved analysis on the full data set from 2006 to 2016 allows a significant increase in statistic compared to previously published results and an extension of energy interval up to 1 TeV.