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Papers by Andrey Turundaevskiy

Physics Letters B, 2020

The aim of the NUCLEON space was to measure spectra of high-energy cosmic rays. The cosmic ray ac... more The aim of the NUCLEON space was to measure spectra of high-energy cosmic rays. The cosmic ray acceleration and propagation processes are determined by the magnetic rigidities of the particles. Thus the magnetic rigidity spectra of cosmic ray carbon and oxygen nuclei obtained by the NUCLEON experiment are analyzed and compared to some other experimental results. The spectral indices calculated for different thresholds with regard to magnetic rigidity are presented. The carbon and oxygen nuclei spectra are steeper than helium nuclei spectra in the 400-10000 GV area. The spectra of carbon and oxygen nuclei are similar to the proton spectrum before the "knee".

Bulletin of the Russian Academy of Sciences: Physics, 2021

The inhomogeneity of the spectrum of cosmic rays in the region of 10 TV (small knee), observed in... more The inhomogeneity of the spectrum of cosmic rays in the region of 10 TV (small knee), observed in the data of direct experiments of cosmic rays, is considered in terms of isotropic diffusion from a single close source. It is shown that such a description is possible. The area of possible space-time localization of the source and its energetics are determined.

JETP Letters, 2020

The aim of the NUCLEON space experiment was to measure spectra of high-energy cosmic rays. Direct... more The aim of the NUCLEON space experiment was to measure spectra of high-energy cosmic rays. Direct measurements of energy spectra of protons and nuclei of cosmic rays which allow separating particles in charge are required to solve important astrophysical problems. The satellite was launched on December 26, 2014, and operated for three years. Measured spectra of protons and alpha particles in the energy range of 2-500 TeV per particle have been presented. The results have been analyzed and compared to other experimental data for lower energies. The ratio of fluxes of protons and alpha particles is nearly constant in a wide range of magnetic rigidities (3-100 TV). Thus, the behavior of the ratio of the spectra is significantly different from a similar dependence in the region of lower magnetic rigidities measured in other experiments. One of the possible explanation of this effect can be given within a model with one close source.

Bulletin of the Russian Academy of Sciences: Physics, 2019

The NUCLEON space observatory was developed to measure the spectra of cosmic ray nuclei with indi... more The NUCLEON space observatory was developed to measure the spectra of cosmic ray nuclei with individual charge resolution in the energy range of several TeV to 1 PeV per particle. The NUCLEON was launched into a heliosynchronous orbit as an additional load on the Resurs-2P production satellite on December 28, 2014, and it is still in operation (2019). This work is a brief review of the results from the NUCLEON observatory over three years of operation in orbit. The spectra of the main primary abundant nuclei and product nuclei of cosmic rays (CRs) are presented. Some new interesting features of the CR spectra found in the NUCLEON data are discussed.

Advances in Space Research, 2019

The NUCLEON-2 experiment is aimed at the investigation of isotope and charge composition of mediu... more The NUCLEON-2 experiment is aimed at the investigation of isotope and charge composition of medium, heavy and ultra-heavy ions (Z < 82) in the 300 MeV/N À1 GeV/N energy range. The concept design of HICRS for the NUCLEON-2 satellite cosmic ray experiment is presented. The performed simulation confirms the isotope resolution algorithms and techniques. Argon isotopes' resolution in the NUCLEON-2 prototype is presented.

Bulletin of the Russian Academy of Sciences: Physics, 2019

The aims and scientific tasks of the space High-Energy Ray Observatory experiment are determined.... more The aims and scientific tasks of the space High-Energy Ray Observatory experiment are determined. The design of the scientific equipment is described. It is characterized by an unprecedently high geometric factor (~20 m 2 sr) and fairly high accuracy of measurement. The performance of the equipment allows precise study of cosmic rays in a wide range of energies, including the completely unstudied region of 10 15-10 16 eV. The current status of the space experiment is determined.

Advances in Space Research, 2019

Abstract In this paper, the goals and scientific tasks of the space experiment “High Energy Rays ... more Abstract In this paper, the goals and scientific tasks of the space experiment “High Energy Rays Observatory” (HERO) are established. The preliminary design of the scientific equipment is presented, the characteristic features of which are its high geometric factor (up to ∼20 m2 sr) and adequate energy measurement resolution (20–30% or better, depending on the type of components). The ionisation tungsten-scintillator calorimeter is used for energy measurement. The total calorimeter weight is equal to 12 tons. The technical characteristics of the equipment permit the direct study of cosmic rays in a wide energy range, including the unexplored region of 1015–1016 eV. The current status of the space experiment is discussed. Currently, the HERO project is in its pre-R&D phase. The launch of the satellite is planned for between 2025 and 2030.

Astronomy Reports, 2019

Some results of studies of cosmic rays obtained during the NUCLEON space experiment in 2015-2017 ... more Some results of studies of cosmic rays obtained during the NUCLEON space experiment in 2015-2017 are presented. This experiment was intended for direct measurements of the energy spectra and chemical composition of cosmic rays (Z = 1−30) in the energy range 2-500 TeV. Results presented include energy spectra for various abundant nuclei measured using the new Kinematic Lightweight Energy Meter (KLEM). The primary energies are established using the spatial densities of secondary particles produced in inelastic interactions with a carbon target.

Bulletin of the Russian Academy of Sciences: Physics, 2017

A brief survey of the data on the isotopic composition of superheavy nuclei in galactic cosmic ra... more A brief survey of the data on the isotopic composition of superheavy nuclei in galactic cosmic rays is presented. The scientific goals of the planned experiment are outlined, and the design of the NUCLEON-2 scientific equipment is given.

Astroparticle Physics, 2017

The NUCLEON experiment aims to study chemical composition and energy spectra of galactic cosmic r... more The NUCLEON experiment aims to study chemical composition and energy spectra of galactic cosmic rays for nuclei charges Z = 1 − 30 and energies 10 11 − 10 15 eV. The research is conducted with the help of the NUCLEON scientific equipment installed on the Russian satellite "Resurs-P" No. 2 as an additional payload. This article describes the results of the first year of the space experiment NUCLEON, including methodological features of data acquisition mode setup, evaluation of the equipment's performance and methods it provides, as well as preliminary results of data analysis.

arXiv (Cornell University), Jul 13, 2019

This article presents a description of a cosmic rays diffusive propagation model of a close point... more This article presents a description of a cosmic rays diffusive propagation model of a close point-like flash lamp like source and an approximation of experimentally observed spectral irregularity with this model. We show that this spectral irregularity can be explained using the presented model and provide the most probable characteristics of such a source as well as several observed and identified sources which can be candidates for this role.

arXiv: High Energy Astrophysical Phenomena, 2018

The NUCLEON experiment is designed to measure chemical composition of cosmic rays with charges fr... more The NUCLEON experiment is designed to measure chemical composition of cosmic rays with charges from Z=1 to 30 in an energy region from 5*10^11 to 10^15 eV. In this article the data analysis algorithm and spectra of Ni and Fe nuclei, measured in the NUCLEON experiment, are presented.

Possible experiments aimed at studying the primary cosmic rays on the Moon’s surface and in orbit... more Possible experiments aimed at studying the primary cosmic rays on the Moon’s surface and in orbit around the Moon are considered. Monte-Carlo simulation was used. Three components (secondary neutrons, gamma rays, and radio waves) of back scattered radiation can be simultaneously registered. These components of radiation are generated by showers developing in the lunar regolith. Primary particle parameters can be reconstructed.

Physics of Particles and Nuclei Letters, 2021

Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017), 2017

The main goal of the High-Energy Ray Observatory (HERO) mission is to perform direct measurements... more The main goal of the High-Energy Ray Observatory (HERO) mission is to perform direct measurements of very high energy cosmic ray. Measurements will concern the following scientific goals: detailed study of charge composition of CR in knee region, studies of the energy spectra of Galactic and extragalactic CR, search for signatures of dark matter particles. HERO is planned to be launched onboard a heavy satellite. This experiment is based on the application of a wide aperture (>2π) deep (~5λ) ionization calorimeter. The effective geometrical factor of the apparatus is not less than 8-16 m 2 sr depending on the type of particles. Under the long exposure (~10 years), this mission will make it possible to precisely measure cosmic rays up to 10 17 eV. Wide Monte-Carlo simulations were performed to obtain instrument response for different species of cosmic rays, including charged particles and gammas.

Physics Letters B, 2020

The aim of the NUCLEON space was to measure spectra of high-energy cosmic rays. The cosmic ray ac... more The aim of the NUCLEON space was to measure spectra of high-energy cosmic rays. The cosmic ray acceleration and propagation processes are determined by the magnetic rigidities of the particles. Thus the magnetic rigidity spectra of cosmic ray carbon and oxygen nuclei obtained by the NUCLEON experiment are analyzed and compared to some other experimental results. The spectral indices calculated for different thresholds with regard to magnetic rigidity are presented. The carbon and oxygen nuclei spectra are steeper than helium nuclei spectra in the 400-10000 GV area. The spectra of carbon and oxygen nuclei are similar to the proton spectrum before the "knee".

Bulletin of the Russian Academy of Sciences: Physics, 2021

The inhomogeneity of the spectrum of cosmic rays in the region of 10 TV (small knee), observed in... more The inhomogeneity of the spectrum of cosmic rays in the region of 10 TV (small knee), observed in the data of direct experiments of cosmic rays, is considered in terms of isotropic diffusion from a single close source. It is shown that such a description is possible. The area of possible space-time localization of the source and its energetics are determined.

JETP Letters, 2020

The aim of the NUCLEON space experiment was to measure spectra of high-energy cosmic rays. Direct... more The aim of the NUCLEON space experiment was to measure spectra of high-energy cosmic rays. Direct measurements of energy spectra of protons and nuclei of cosmic rays which allow separating particles in charge are required to solve important astrophysical problems. The satellite was launched on December 26, 2014, and operated for three years. Measured spectra of protons and alpha particles in the energy range of 2-500 TeV per particle have been presented. The results have been analyzed and compared to other experimental data for lower energies. The ratio of fluxes of protons and alpha particles is nearly constant in a wide range of magnetic rigidities (3-100 TV). Thus, the behavior of the ratio of the spectra is significantly different from a similar dependence in the region of lower magnetic rigidities measured in other experiments. One of the possible explanation of this effect can be given within a model with one close source.

Bulletin of the Russian Academy of Sciences: Physics, 2019

The NUCLEON space observatory was developed to measure the spectra of cosmic ray nuclei with indi... more The NUCLEON space observatory was developed to measure the spectra of cosmic ray nuclei with individual charge resolution in the energy range of several TeV to 1 PeV per particle. The NUCLEON was launched into a heliosynchronous orbit as an additional load on the Resurs-2P production satellite on December 28, 2014, and it is still in operation (2019). This work is a brief review of the results from the NUCLEON observatory over three years of operation in orbit. The spectra of the main primary abundant nuclei and product nuclei of cosmic rays (CRs) are presented. Some new interesting features of the CR spectra found in the NUCLEON data are discussed.

Advances in Space Research, 2019

The NUCLEON-2 experiment is aimed at the investigation of isotope and charge composition of mediu... more The NUCLEON-2 experiment is aimed at the investigation of isotope and charge composition of medium, heavy and ultra-heavy ions (Z < 82) in the 300 MeV/N À1 GeV/N energy range. The concept design of HICRS for the NUCLEON-2 satellite cosmic ray experiment is presented. The performed simulation confirms the isotope resolution algorithms and techniques. Argon isotopes' resolution in the NUCLEON-2 prototype is presented.

Bulletin of the Russian Academy of Sciences: Physics, 2019

The aims and scientific tasks of the space High-Energy Ray Observatory experiment are determined.... more The aims and scientific tasks of the space High-Energy Ray Observatory experiment are determined. The design of the scientific equipment is described. It is characterized by an unprecedently high geometric factor (~20 m 2 sr) and fairly high accuracy of measurement. The performance of the equipment allows precise study of cosmic rays in a wide range of energies, including the completely unstudied region of 10 15-10 16 eV. The current status of the space experiment is determined.

Advances in Space Research, 2019

Abstract In this paper, the goals and scientific tasks of the space experiment “High Energy Rays ... more Abstract In this paper, the goals and scientific tasks of the space experiment “High Energy Rays Observatory” (HERO) are established. The preliminary design of the scientific equipment is presented, the characteristic features of which are its high geometric factor (up to ∼20 m2 sr) and adequate energy measurement resolution (20–30% or better, depending on the type of components). The ionisation tungsten-scintillator calorimeter is used for energy measurement. The total calorimeter weight is equal to 12 tons. The technical characteristics of the equipment permit the direct study of cosmic rays in a wide energy range, including the unexplored region of 1015–1016 eV. The current status of the space experiment is discussed. Currently, the HERO project is in its pre-R&D phase. The launch of the satellite is planned for between 2025 and 2030.

Astronomy Reports, 2019

Some results of studies of cosmic rays obtained during the NUCLEON space experiment in 2015-2017 ... more Some results of studies of cosmic rays obtained during the NUCLEON space experiment in 2015-2017 are presented. This experiment was intended for direct measurements of the energy spectra and chemical composition of cosmic rays (Z = 1−30) in the energy range 2-500 TeV. Results presented include energy spectra for various abundant nuclei measured using the new Kinematic Lightweight Energy Meter (KLEM). The primary energies are established using the spatial densities of secondary particles produced in inelastic interactions with a carbon target.

Bulletin of the Russian Academy of Sciences: Physics, 2017

A brief survey of the data on the isotopic composition of superheavy nuclei in galactic cosmic ra... more A brief survey of the data on the isotopic composition of superheavy nuclei in galactic cosmic rays is presented. The scientific goals of the planned experiment are outlined, and the design of the NUCLEON-2 scientific equipment is given.

Astroparticle Physics, 2017

The NUCLEON experiment aims to study chemical composition and energy spectra of galactic cosmic r... more The NUCLEON experiment aims to study chemical composition and energy spectra of galactic cosmic rays for nuclei charges Z = 1 − 30 and energies 10 11 − 10 15 eV. The research is conducted with the help of the NUCLEON scientific equipment installed on the Russian satellite "Resurs-P" No. 2 as an additional payload. This article describes the results of the first year of the space experiment NUCLEON, including methodological features of data acquisition mode setup, evaluation of the equipment's performance and methods it provides, as well as preliminary results of data analysis.

arXiv (Cornell University), Jul 13, 2019

This article presents a description of a cosmic rays diffusive propagation model of a close point... more This article presents a description of a cosmic rays diffusive propagation model of a close point-like flash lamp like source and an approximation of experimentally observed spectral irregularity with this model. We show that this spectral irregularity can be explained using the presented model and provide the most probable characteristics of such a source as well as several observed and identified sources which can be candidates for this role.

arXiv: High Energy Astrophysical Phenomena, 2018

The NUCLEON experiment is designed to measure chemical composition of cosmic rays with charges fr... more The NUCLEON experiment is designed to measure chemical composition of cosmic rays with charges from Z=1 to 30 in an energy region from 5*10^11 to 10^15 eV. In this article the data analysis algorithm and spectra of Ni and Fe nuclei, measured in the NUCLEON experiment, are presented.

Possible experiments aimed at studying the primary cosmic rays on the Moon’s surface and in orbit... more Possible experiments aimed at studying the primary cosmic rays on the Moon’s surface and in orbit around the Moon are considered. Monte-Carlo simulation was used. Three components (secondary neutrons, gamma rays, and radio waves) of back scattered radiation can be simultaneously registered. These components of radiation are generated by showers developing in the lunar regolith. Primary particle parameters can be reconstructed.

Physics of Particles and Nuclei Letters, 2021

Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017), 2017

The main goal of the High-Energy Ray Observatory (HERO) mission is to perform direct measurements... more The main goal of the High-Energy Ray Observatory (HERO) mission is to perform direct measurements of very high energy cosmic ray. Measurements will concern the following scientific goals: detailed study of charge composition of CR in knee region, studies of the energy spectra of Galactic and extragalactic CR, search for signatures of dark matter particles. HERO is planned to be launched onboard a heavy satellite. This experiment is based on the application of a wide aperture (>2π) deep (~5λ) ionization calorimeter. The effective geometrical factor of the apparatus is not less than 8-16 m 2 sr depending on the type of particles. Under the long exposure (~10 years), this mission will make it possible to precisely measure cosmic rays up to 10 17 eV. Wide Monte-Carlo simulations were performed to obtain instrument response for different species of cosmic rays, including charged particles and gammas.