Персона: Леонов, Алексей Анатольевич
Загружается...
Email Address
Birth Date
Научные группы
Научная группа
Научная группа
Организационные подразделения
Организационная единица
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.
Статус
Фамилия
Леонов
Имя
Алексей Анатольевич
Имя
43 results
Результаты поиска
Теперь показываю 1 - 10 из 43
- ПубликацияОткрытый доступSpace-based GAMMA-400 mission for direct gamma- and cosmic-ray observations(2019) Topchiev, N. P.; Bakaldin, A. V.; Dalkarov, O. D.; Egorov, A. E.; Galper, A. M.; Arkhangelskaja, I. V.; Arkhangelskiy, A. I.; Chernysheva, I. V.; Kheymits, M. D.; Leonov, A. А.; Yu, Naumov, P.; Runtso, M. F.; Yurkin, Y. T.; Архангельская, Ирина Владимировна; Архангельский, Андрей Игоревич; Чернышева, Ирина Вячеславовна; Хеймиц, Максим Дмитриевич; Леонов, Алексей Анатольевич; Наумов, Петр Юрьевич; Юркин, Юрий Тихонович© Published under licence by IOP Publishing Ltd. The future space-based GAMMA-400 mission is intended for direct gamma- and cosmic-ray observations in the highly elliptic orbit during 7-10 years. GAMMA-400, currently developing gamma-ray telescope, will observe in the energy range from ∼20 MeV to several TeV some regions of the Universe (such as Galactic Center, Fermi Bubbles, Crab, Cygnus, etc.) with the unprecedented angular (∼0.01° at E γ = 100 GeV) and energy (∼1% at E γ = 100 GeV) resolutions better than the Fermi-LAT, as well as ground gamma-ray telescopes, by a factor of 5-10. GAMMA-400 will also study cosmic rays in the energy range of up to ∼20 TeV due to deep calorimeter (22 r.l. and 53 r.l. for vertical and lateral events, respectively). GAMMA-400 will permit to resolve gamma rays from dark matter particles, identify many discrete sources (many of which are variable), to clarify the structure of extended sources, to specify the data on the diffuse emission. GAMMA-400 will also specify the sources and the spectra of cosmic-ray electrons + positrons.
- ПубликацияОткрытый доступDesign of the readout electronics for the fast trigger and time of flight of the GAMMA-400 gamma-ray telescope(2020) Bakaldin, A. V.; Dalkarov, O. D.; Egorov, A. E.; Gusakov, Y. V.; Arkhangelskiy, A. I.; Galper, A. M.; Arkhangelskaja, I. V.; Chasovikov, E. N.; Chernysheva, I. V.; Kheymits, M. D.; Leonov, A. A.; Runtso, M. F.; Yurkin, Y. T.; Архангельский, Андрей Игоревич; Архангельская, Ирина Владимировна; Часовиков, Евгений Николаевич; Чернышева, Ирина Вячеславовна; Хеймиц, Максим Дмитриевич; Леонов, Алексей Анатольевич; Юркин, Юрий Тихонович© Published under licence by IOP Publishing Ltd.The GAMMA-400 gamma-ray telescope is planned for the launch at the end of this decade on the Navigator service platform designed by Lavochkin Association on an elliptical orbit with following initial parameters: An apogee ∼300000, a perigee ∼500 km, a rotation period ∼7 days and inclination of 51.4°. The apparatus is expected to operate more than 5 years, reaching an unprecedented sensitivity for the search of dark matter signatures and the study of the unresolved and so far unidentified gamma-ray sources. An electronics system, which consists of 14 front-end multichannel electronics modules and the main processing unit with a total power consumption of about 400 W (74W for main processing unit), has been developed for providing fast trigger and veto for the data taking to the experiment. The communication between front-end modules, main processing unit and scientific data acquisition system of the gamma-ray telescope is performed via high-speed SPACEWIRE network. To assure the long-Term reliability in space environment, a series of critical issues such as the radiation hardness, thermal design, components and board level quality control, warm and cold redundancy are taken into consideration. The main design concepts for the system, measurements setups together with some test results are presented.
- ПубликацияТолько метаданныеA method of reconstruction of anisotropic fluxes of geomagnetically trapped particles from in-flight measurements of high precision(2024) Leonov, A. A.; Malakhov, V. V.; Mayorov, A. G.; Mikhailov, V. V.; Леонов, Алексей Анатольевич; Малахов, Виталий Валерьевич; Майоров, Андрей Георгиевич
- ПубликацияТолько метаданныеBoron Isotopes in the PAMELA Experiment(2024) Bogomolov, E. A.; Vasilyev, G. I.; Menn, W.; Adriani, O.; Voronov, S. A.; Galper, A. M.; Koldobskiy, S. A.; Lagoida, I. A.; Leonov, A. A.; Mayorov, A. G.; Malakhov, V. V.; Mikhailov, V. V.; Yurkin, Y. T.; Воронов, Сергей Александрович; Колдобский, Сергей Александрович; Лагойда, Илья Алексеевич; Леонов, Алексей Анатольевич; Майоров, Андрей Георгиевич; Малахов, Виталий Валерьевич; Михайлов, Владимир Владимирович; Юркин, Юрий Тихонович
- ПубликацияОткрытый доступCapabilities of the GAMMA-400 gamma-ray telescope for lateral aperture(2020) Bakaldin, A. V.; Minaev, P. Y.; Suchkov, S. I.; Topchiev, N. P.; Mikhailova, A. V.; Chernysheva, I. V.; Galper, A. M.; Kheymits, M. D.; Leonov, A. A.; Mayorov, A. G.; Mikhailov, V. V.; Yurkin, Y. T.; Михайлова, Анна Владимировна; Чернышева, Ирина Вячеславовна; Хеймиц, Максим Дмитриевич; Леонов, Алексей Анатольевич; Майоров, Андрей Георгиевич; Михайлов, Владимир Владимирович; Юркин, Юрий Тихонович© Published under licence by IOP Publishing Ltd.The future GAMMA-400 γ-ray telescope will provide fundamentally new data on discrete sources and spectra of γ-ray emissions and electrons + positrons due to its unique angular and energy resolutions in the wide energy range from 20 MeV up to several TeV. The γ-ray telescope consists of the anticoincidence system (AC), the converter-Tracker (C), the time-of-flight system (S1 and S2), the position-sensitive and electromagnetic calorimeters (CC1 and CC2), the scintillation detectors of the calorimeter (S3 and S4) and lateral anticoincidence detectors of the calorimeter (LD). To extend the GAMMA-400 capabilities to measure γ-ray bursts, Monte-Carlo simulations were performed for lateral aperture of the one of the versions of GAMMA-400. Second-level trigger based on signals from CC2, LD, S3, and S4 allows us to detect γ-ray bursts in the energy range of ∼10-300 MeV with high effective area about 1 m2.
- ПубликацияОткрытый доступCosmic Rays Investigation by the PAMELA experiment(2020) Panico, B.; Campana, D.; Osteria, G.; Barbarino, G. C.; Galper, A. M.; Karelin, A. V.; Koldashov, S. V.; Koldobskiy, S.; Yurkin, Y. T.; Malakhov, V.; Leonov, A.; Mayorov, A. G.; Mikhailov, V. V.; Voronov, S. A.; Колдобский, Сергей Александрович; Юркин, Юрий Тихонович; Малахов, Виталий Валерьевич; Леонов, Алексей Анатольевич; Майоров, Андрей Георгиевич; Михайлов, Владимир Владимирович; Воронов, Сергей Александрович© Published under licence by IOP Publishing Ltd.PAMELA (Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics) is a satellite-borne experiment. It was launched on June 15th 2006 from the Baikonur space centre on board the Russian Resurs-DK1 satellite. For about 10 years PAMELA took data, giving a fundamental contribution to the cosmic ray physics. It made high-precision measurements of the charged component of the cosmic radiation challenging the standard model of the mechanisms of production, acceleration and propagation of cosmic rays in the galaxy and in the heliosphere. PAMELA gave results on different topics on a very wide range of energy. Moreover, the long PAMELA life gives the possibility to study the variation of the proton, electron and positron spectra during the last solar minimum. The time dependence of the cosmic-ray proton and helium nuclei from the solar minimum through the following period of solar maximum activity is currently being studied. Low energy particle spectra were accurately measured also for various solar events that occurred during the PAMELA mission. In this paper a review of main PAMELA results will be reported.
- ПубликацияОткрытый доступTime Dependence of the Flux of Helium Nuclei in Cosmic Rays Measured by the PAMELA Experiment between 2006 July and 2009 December(2020) Marcelli, N.; Boezio, M.; Lenni, A.; Menn, W.; Galper, A. M.; Koldashov, S. V.; Koldobskiy, S. A.; 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 ТихоновичPrecise time-dependent measurements of the Z = 2 component in the cosmic radiation provide crucial information about the propagation of charged particles through the heliosphere. The PAMELA experiment, with its long flight duration (2006 June 15-2016 January 23) and the low energy threshold (80 MeV/n) is an ideal detector for cosmic-ray solar modulation studies. In this paper, the helium nuclei spectra measured by the PAMELA instrument from 2006 July to 2009 December over a Carrington rotation time basis are presented. A state-of-the-art three-dimensional model for cosmic-ray propagation inside the heliosphere was used to interpret the time-dependent measured fluxes. Proton-to-helium flux ratio time profiles at various rigidities are also presented in order to study any features that could result from the different masses and local interstellar spectra shapes.
- ПубликацияОткрытый доступTime dependence of the proton and helium flux measured by PAMELA(2020) Panico, B.; Campana, D.; Osteria, G.; Barbarino, G. C.; Galper, A. M.; Karelin, A. V.; Koldashov, S. V.; Koldobskiy, S.; Yurkin, Y. T.; Malakhov, V.; Leonov, A.; Mayorov, A. G.; Mikhailov, V. V.; Voronov, S. A.; Колдобский, Сергей Александрович; Юркин, Юрий Тихонович; Малахов, Виталий Валерьевич; Леонов, Алексей Анатольевич; Майоров, Андрей Георгиевич; Михайлов, Владимир Владимирович; Воронов, Сергей Александрович© Published under licence by IOP Publishing Ltd.The energy spectra of galactic cosmic rays carry fundamental information regarding their origin and propagation, but, near Earth, cosmic rays are significantly affected by the solar magnetic field which changes over time. The time dependence of proton and electron spectra were measured from July 2006 to December 2009 by PAMELA experiment, that is a ballooon-borne experiment collecting data since 15 June 2006. These studies allowed to obtain a more complete description of the cosmic radiation, providing fundamental information about the transport and modulation of cosmic rays inside the heliosphere. The study of the time dependence of the cosmic-ray protons and helium nuclei from the unusual 23rd solar minimum through the following period of solar maximum activity is presented.
- ПубликацияТолько метаданныеDark matter searches by the planned gamma-ray telescope GAMMA-400(2020) Egorov, A. E.; Topchiev, N. P.; Dalkarov, O. D.; Suchkov, S. I.; Galper, A. M.; Leonov, A. A.; Yurkin, Y. T.; Леонов, Алексей Анатольевич; Юркин, Юрий Тихонович© 2020 IOP Publishing Ltd and Sissa Medialab.Our paper reviews the planned space-based gamma-ray telescope GAMMA-400 and evaluates in details its opportunities in the field of dark matter (DM) indirect searches. We estimated the GAMMA-400 mean sensitivity to the diphoton DM annihilation cross section in the Galactic center for DM particle masses in the range of 1-500 GeV. We obtained the sensitivity gain at least by 1.2-1.5 times (depending on DM particle mass) with respect to the expected constraints from 12 years of observations by Fermi-LAT for the case of Einasto DM density profile. The joint analysis of the data from both telescopes may yield the gain up to 1.8-2.3 times. Thus the sensitivity reaches the level of annihilation cross section 〈 σ v 〉γγ(mχ = 100 GeV) ≈ 10-28 cm3/s. This will allow us to test the hypothesized narrow lines predicted by specific DM models, particularly the recently proposed pseudo-Goldstone boson DM model. We also considered the decaying DM - in this case the joint analysis may yield the sensitivity gain up to 1.1-2.0 times reaching the level of DM lifetime τγν(mχ = 100 GeV) ≈ 2 ċ 1029 s. We estimated the GAMMA-400 sensitivity to axion-like particle (ALP) parameters by a potential observation of the supernova explosion in the Local Group. This is very sensitive probe of ALPs reaching the level of ALP-photon coupling constant gaγ ∼ 10-13 GeV-1 for ALP masses ma ≲ 1 neV. We also calculated the sensitivity to ALPs by constraining the modulations in the spectra of the Galactic gamma-ray pulsars due to possible ALP-photon conversion. GAMMA-400 is expected to be more sensitive than the CAST helioscope for ALP masses ma ≈ (1 - 10) neV reaching gaγmin ≈ 2 ċ 10-11 GeV-1. Other potentially interesting targets and candidates are briefly considered too.
- ПубликацияТолько метаданныеThe Anticoincidence System of Space-Based Gamma-Ray Telescope GAMMA-400, Test Beam Studies of Anticoincidence Detector Prototype with SiPM Readout(2020) Bakaldin, A. V.; Dalkarov, O. D.; Egorov, A. E.; Gusakov, Y. V.; Arkhangelskiy, A. I.; Galper, A. M.; Arkhangelskaja, I. V.; Chernysheva, I. V.; Kheymits, M. D.; Leonov, A. A.; Runtso, M. F.; Yurkin, Y. T.; Архангельский, Андрей Игоревич; Архангельская, Ирина Владимировна; Чернышева, Ирина Вячеславовна; Хеймиц, Максим Дмитриевич; Леонов, Алексей Анатольевич; Юркин, Юрий Тихонович© 2020, Pleiades Publishing, Ltd.Abstract: The GAMMA-400 gamma-ray telescope is planned for the launch at the end of 2026 on the Navigator service platform designed by Lavochkin Association on an elliptical orbit with following initial parameters: an apogee ̴300 000, a perigee ̴500 km, a rotation period ̴7 days and inclination of 51.4̊. The apparatus is expected to operate for more than 5 years, reaching an unprecedented sensitivity for the search of dark matter signatures and the study of the unresolved and so far unidentified gamma-ray sources. The segmented anticoincidence counters surround the converter-tracker and calorimeter of the telescope with the purpose of vetoing to assure a clean track reconstruction and charged particle background suppression. The anticoincidence detector prototype based on long BC-408 scintillator with silicon photomultipliers readout was tested using 300-MeV positron beam of synchrotron C-25P ‘‘PAKHRA’’ of Lebedev Physical Institute. The measurement setup, design concepts for the prototype detector together with test results are discussed.