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1. Four years of wide-field search for nanosecond optical transients with the TAIGA-HiSCORE Cherenkov array

Author

Panov, A. D., Astapov, I. I., Beskin, G. M., Bezyazykov, P. A., Blinov, A. V., Bonvech, E. A., Borodin, A. N., Budnev, N. M., Bulan, A. V., Chernov, P. Busygina D. V., Chiavassa, A., Dyachok, A. N., Gafarov, A. R., Garmash, A. Yu., Grebenyuk, V. M., Gress, E. O., Gress, O. A., Gress, T. I., Grinyuk, A. A., Grishin, O. G., Ivanova, A. L., Ivanova, A. D., Ilyushin, M. A., Kalmykov, N. N., Kindin, V. V., Kiryuhin, S. N., Kokoulin, R. P., Kompaniets, K. G., Korosteleva, E. E., Kozhin, V. A., Kravchenko, E. A., Kuzmichev, L. A., Kryukov, A. P., Lagutin, A. A., Lavrova, M. V., Lemeshev, Yu., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Lukanov, A. D., Malakhov, S. D., Mirgazov, R. R., Monkhoev, R. D., Okyneva, E. A., Osipova, E. A., Pakhorukov, A. L., Pan, A., Pankov, L. V., Petrukhin, A. A., Podgrudkov, D. A., Poddubny, I. A., Popova, E. G., Postnikov, E. B., Prosin, V. V., Pushnin, A. A., Raikin, R. I., Razumov, A. Yu., Rjabov, E., Rubtsov, G. I., Samoliga, V. S., Shaikovsky, A. V., Sidorenkov, A. Yu., Silaev, A. A., Skurikhin, A. V., Satyshev, I., Sokolov, A. V., Sveshnikova, L. G., Tabolenko, V. A., Tanaev, A. B., Ternovoy, M., Tkachev, L. G., Ushakov, N., Volchugov, P. A., Volkov, N. V., Voronin, D. M., Yashin, I. I., Zagorodnikov, A. V., Zhurov, D. P., and Zirakashvili, V. N.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract

It has been previously demonstrated [Panov et al. Physics of Atomic Nuclei 84(2021)1037] that the TAIGA-HiSCORE Cherenkov array, originally built for cosmic ray physics and ultrahigh-energy gamma-ray astronomy studies using the extensive air shower method, can be used in conventional optical astronomy for wide-field searches for rare nanosecond optical transients of astrophysical origin. The FOV of the facility is on the scale of 1~ster, and it is capable of detecting very rare transients in the visible light range with fluxes greater than approximately 3000~quanta/m$^2$/10~ns (10~ns is the apparatus integration time) and pulse durations of 10\,ns. Among the potential sources of distant nanosecond optical transients are the evaporation of primary black holes, magnetic reconnection in the accretion disks of black holes, and signals from distant lasers of extraterrestrial civilizations. The paper describes the methods and results of the search for optical transients using the TAIGA-HiSCORE Cherenkov array from 2018 to 2022 (four winter seasons of data collection). No reliable astrophysical candidates for optical transients were found. We set an upper bound on the flux of the searched events as $\sim 1\times10^{-3}$\,events/ster/h., Comment: 20 figures, 46 pages

Published
2024

2. Search for High-Energy Gamma Quanta from the Cygnus Cocoon Source in October–November 2020

Author

Okuneva, E., Sveshnikova, L., Astapov, I., Bezyazykov, P., Blinov, A., Borodin, A., Bonvech, E., Budnev, N., Bulan, A., Busygin, P., Vaidyanatan, A., Volkov, N., Volchugov, P., Voronin, D., Gafarov, A., Gres, E., Gres, O., Gres, T., Grishin, O., Garmash, A., Grebenyuk, V., Grinyuk, A., Dyachok, A., Zhurov, D., Zagorodnikov, A., Ivanova, A., Ivanova, A., Ilyushin, M., Kalmykov, N., Kindin, V., Kiryukhin, V., Kokoulin, R., Kolosov, N., Kompaniets, K., Korosteleva, E., Kozhin, V., Kravchenko, E., Kryukov, A., Kuzmichev, L., Chiavassa, A., Lavrova, M., Lagutin, A., Lemeshev, Y., Lubsandorzhiev, B., Lubsandorzhiev, N., Malakhov, S., Mirgazov, R., Monkhoev, R., Osipova, E., Pakhorukov, A., Pan, A., Panov, A., Pankov, L., Petrukhin, A., Podgrudkov, D., Poddubny, I., Popova, E., Postnikov, E., Prosin, V., Ptuskin, V., Pushnin, A., Razumov, A., Raikin, R., Rubtsov, G., Ryabov, E., Samoliga, V., Satyshev, I., Silaev, A., Silaev, Jr., A., Sidorenkov, A., Skurikhin, A., Sokolov, A., Tabolenko, V., Tanaev, A., Ternovoy, M., Tkachev, L., Ushakov, N., Chernov, D., and Yashin, I.

Published
2024
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3. γ-Ray Detection with the TAIGA-IACT Installation in the Stereo Mode of Observation

Author

Volchugov, P. A., Astapov, I. I., Bez’’yazykov, P. A., Bonvech, E. A., Borodin, A. N., Budnev, N. M., Bulan, A. V., Vaidyanatan, A., Volkov, N. V., Voronin, D. M., Gafarov, A. R., Gres’, E. O., Gres’, O. A., Gres’, T. I., Grishin, O. G., Garmash, A. Yu., Grebenyuk, V. M., Grinyuk, A. A., Dyachok, A. N., Zhurov, D. P., Zagorodnikov, A. V., Ivanova, A. D., Ivanova, A. L., Ilyushin, M. A., Kalmykov, N. N., Kindin, V. V., Kiryukhin, S. N., Kokoulin, R. P., Kolosov, N. I., Kompaniets, K. G., Korosteleva, E. E., Kozhin, V. A., Kravchenko, E. A., Kryukov, A. P., Kuz’michev, L. A., K’yavassa, A., Lagutin, A. A., Lavrova, M. V., Lemeshev, Yu. E., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Malakhov, S. D., Mirgazov, R. R., Monkhoev, R. D., Okuneva, E. A., Osipova, E. A., Panov, A. D., Pakhorukov, A. L., Pan, A., Pan’kov, L. V., Petrukhin, A. A., Podgrudkov, D. A., Popova, E. G., Postnikov, E. B., Prosin, V. V., Ptuskin, V. S., Pushnin, A. A., Razumov, A. Yu., Raikin, R. I., Rubtsov, G. I., Ryabov, E. V., Samoliga, V. S., Satyshev, I., Sveshnikova, L. G., Silaev, A. A., Silaev (Jr.), A. A., Sidorenkov, A. Yu., Skurikhin, A. V., Sokolov, A. V., Tabolenko, V. A., Tanaev, A. B., Ternovoi, M. Yu., Tkachev, L. G., Ushakov, N. A., Chernov, D. V., and Yashin, I. I.

Published
2024
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4. TAIGA -- an advanced hybrid detector complex for astroparticle physics and high energy gamma-ray astronomy

Author

Budnev, N. M., Astapov, I., Bezyazeekov, P., Bonvech, E., Borodin, A., Bulan, A., Chernov, D., Chiavassa, A., Dyachok, A., Gafarov, A., Garmash, A., Grebenyuk, V., Gress, E., Gress, O., Gress, T., Grinyuk, A., Grishin, O., Ivanova, A. D., Ivanova, A. L., Kalmykov, N., Kindin, V., Kiryuhin, S., Kokoulin, R., Kompaniets, K., Korosteleva, E., Kozhin, V., Kravchenko, E., Kryukov, A., Kuzmichev, L., Lagutin, A., Lavrova, M., Lemeshev, Y., Lubsandorzhiev, B., Lubsandorzhiev, N., Lukanov, A., Lukyantsev, D., Malakhov, S., Mirgazov, R., Monkhoev, R., Osipova, E., Pakhorukov, A., Pankov, L., Pan, A., Panov, A., Petrukhin, A., Poddubnyi, I., Podgrudkov, D., Ponomareva, V., Popova, E., Postnikov, E., Prosin, V., Ptuskin, V., Pushnin, A., Raikin, R., Razumov, A., Rubtsov, G., Ryabov, E., Samoliga, V., Satyshev, A., Silaev, A., Sidorenkov, A., Skurikhin, A., Sokolov, A., Sveshnikova, L., Tabolenko, V., Tkachev, L., Tanaev, A., Ternovoy, M., Togoo, R., Ushakov, N., Vaidyanathan, A., Volchugov, P., Volkov, N., Voronin, D., Zagorodnikov, A., Zhurov, D., and Yashin, I.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The physical motivations, present status, main results in study of cosmic rays and in the field of gamma-ray astronomy as well future plans of the TAIGA-1 (Tunka Advanced Instrument for cosmic ray physics and Gamma Astronomy) project are presented. The TAIGA observatory addresses ground-based gamma-ray astronomy and astroparticle physics at energies from a few TeV to several PeV, as well as cosmic ray physics from 100 TeV to several EeV. The pilot TAIGA-1 complex is located in the Tunka valley, ~50 km west from the southern tip of the lake Baikal., Comment: Submission to SciPost Phys. Proc., 10 pages, 2 figures

Published
2022

5. Primary Cosmic Rays Energy Spectrum and Mean Mass Composition by the Data of the TAIGA Astrophysical Complex

Author

Prosin, V., Astapov, I., Bezyazeekov, P., Bonvech, E., Borodin, A., Bulan, A., Chiavassa, A., Chernov, D., Dyachok, A., Gafarov, A., Garmash, A., Grebenyuk, V., Gress, O., Gress, E., Gress, T., Grinyuk, A., Grishin, O., Ivanova, A. D., Ivanova, A. L., Kalmykov, N., Kindin, V., Kiryuhin, S., Kokoulin, R., Komponiets, K., Korosteleva, E., Kozhin, V., Kravchenko, E., Kryukov, A., Kuzmichev, L., Lagutin, A., Lavrova, M., Lemeshev, Y., Lubsandorzhiev, B., Lubsandorzhiev, N., Lukanov, A., Lukyantsev, D., Malakhov, S., Mirgazov, R., Monkhoev, R., Okuneva, E., Osipova, E., Pakhorukov, A., Pan, A., Panasenko, L., Pankov, L., Panov, A. D., Petrukhin, A., Poddubny, I., Podgrudkov, D., Poleschuk, V., Ponomareva, V., Popova, E., Postnikov, E., Ptuskin, V., Pushnin, A., Raikin, R., Razumov, A., Rubtsov, G., Ryabov, E., Sagan, Y., Samoliga, V., Silaev, A., Silaev Jr, A., Sidorenkov, A., Skurikhin, A., Sokolov, A., Sveshnikova, L., Tabolenko, V., Tanaev, A., Tarashchansky, B., Ternovoy, M. Y., Tkachev, L., Togoo, R., Ushakov, N., Vaidyanathan, A., Volchugov, P., Volkov, N., Voronin, D., Zagorodnikov, A., Zhaglova, A., Zhurov, D., and Yashin, I.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

The corrected dependence of the mean depth of the EAS maximum $X_{max}$ on the energy was obtained from the data of the Tunka-133 array for 7 years and the TAIGA-HiSCORE array for 2 years. The parameter $\langle\ln A\rangle$, characterizing the mean mass compositon was derived from these results. The differential energy spectrum of primary cosmic rays in the energy range of $2\cdot 10^{14}$ - $2\cdot 10^{16}$\,eV was reconstructed using the new parameter $Q_{100}$ the Cherenkov light flux at the core distance 100 m.}, Comment: 6 pages, 3 figures, Submitted to SciPost Phys.Proc

Published
2022

6. The Tunka-Grande scintillation array: current results

Author

Ivanova, A. L., Astapov, I., Bezyazeekov, P., Bonvech, E., Borodin, A., Budnev, N., Bulan, A., Chernov, D., Chiavassa, A., Dyachok, A., Gafarov, A., Garmash, A., Grebenyuk, V., Gress, E., Gress, O., Gress, T., Grinyuk, A., Grishin, O., Ivanova, A. D., Kalmykov, N., Kindin, V., Kiryuhin, S., Kokoulin, R., Kompaniets, K., Korosteleva, E., Kozhin, V., Kravchenko, E., Kryukov, A., Kuzmichev, L., Lagutin, A., Lavrova, M., Lemeshev, Y., Lubsandorzhiev, B., Lubsandorzhiev, N., Lukanov, A., Lukyantsev, D., Malakhov, S., Mirgazov, R., Monkhoev, R., Osipova, E., Pakhorukov, A., Pankov, L., Pan, A., Panov, A., Petrukhin, A., Poddubnyi, I., Podgrudkov, D., Poleschuk, V., Ponomareva, V., Popova, E., Postnikov, E., Prosin, V., Ptuskin, V., Pushnin, A., Raikin, R., Razumov, A., Rubtsov, G., Ryabov, E., Sagan, Y., Samoliga, V., Satyshev, A., Silaev, A., Sidorenkov, A., Skurikhin, A., Sokolov, A., Sveshnikova, L., Tabolenko, V., Tkachev, L., Tanaev, A., Ternovoy, M., Togoo, R., Ushakov, N., Vaidyanathan, A., Volchugov, P., Volkov, N., Voronin, D., Zagorodnikov, A., Zhurov, D., and Yashin, I.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract

The Tunka-Grande experiment is a scintillation array with about 0.5 sq.km sensitive area at Tunka Valley, Siberia, for measuring charged particles and muons in extensive air showers (EASs). Tunka-Grande is optimized for cosmic ray studies in the energy range 10 PeV to about 1 EeV, where exploring the composition is of fundamental importance for understanding the transition from galactic to extragalactic origin of cosmic rays. This paper attempts to provide a synopsis of the current results of the experiment. In particular, the reconstruction of the all-particle energy spectrum in the range of 10 PeV to 1 EeV based on experimental data from four observation seasons is presented., Comment: 7 pages, 3 figures, submission to SciPost Phys. Proc

Published
2022

7. Muon lateral distribution function of extensive air showers: results of the Sydney University Giant Air-shower Recorder versus modern Monte-Carlo simulations

Author

Kalmykov, N. N., Karpikov, I. S., Rubtsov, G. I., and Troitsky, S. V.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Phenomenology
Abstract

The Sydney University Giant Air-shower Recorder (SUGAR) measured the muon component of extensive air showers with a unique array of muon detectors. The SUGAR data allow us to reconstruct the empirical dependence of muon density on the distance from the axis of the shower, the lateral distribution function (LDF). We compare the shape of this function with the predictions of hadronic-interaction models, QGSJET-II-04 and EPOS-LHC, in the energy range 10^17.6 - 10^18.6 eV. We find a difference between the observed data and the simulation: the observed muon density falls faster with the increased core distance than it is predicted in simulations. This observation may be important for interpretation of the energy-dependent discrepancies in the simulated and observed numbers of muons in air showers, known as the "muon excess"., Comment: 7 pages revtex, 4 figures (7 panels). V2: discussion of systematic uncertainties added, results unchanged. Version accepted by Phys. Rev. D

Published
2022
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8. Status of the TAIGA Experiment: Gamma Astronomy

Author

Sveshnikova, L., Astapov, I., Bezyazykov, P., Blinov, A., Bonvech, E., Borodin, A., Budnev, N., Bulan, A., Vaidyanathan, A., Volkov, N., Volchugov, P., Voronin, D., Garmash, A., Gafarov, A., Grebenyuk, V., Gress, E., Gress, O., Gress, T., Grinyuk, A., Grishin, O., Dyachok, A., Zhurov, D., Zagorodnikov, A., Ivanova, A. L., Ilyushin, M., Kalmykov, N., Kindin, V., Kiryukhin, S., Kozhin, V., Kokoulin, R., Kolosov, N., Kompaniets, K., Korosteleva, E., Kravchenko, E., Kryukov, A., Kuzmichev, L., Chiavassa, A., Lavrova, M., Lagutin, A., Lemeshev, Yu., Lubsandorzhiev, B., Lubsandorzhiev, N., Mirgazov, R., Monkhoev, R., Okuneva, E., Osipova, E., Pan, A., Panov, A., Pankov, L., Pakhorukov, A., Petrukhin, A., Podgrudkov, D., Popova, E., Postnikov, E., Prosin, V., Ptuskin, V., Pushnin, A., Razumov, A., Raikin, R., Rubtsov, G., Ryabov, E., Samoliga, V., Satyshev, I., Sidorenkov, A., Silaev, A., Silaev, Jr., A., Skurikhin, A., Sokolov, A., Tabolenko, V., Tanaev, A., Ternovoy, M., Tkachev, L., Ushakov, N., Chernov, D., Shipilov, D., and Yashin, I.

Published
2023
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9. Search for Astrophysical Nanosecond Optical Transients with TAIGA-HiSCORE Array

Author

Panov, A. D., Astapov, I. I., Awad, A. K., Beskin, G. M., Bezyazeekov, P. A., Blank, M., Bonvech, E. A., Borodin, A. N., Bruckner, M., Budnev, N. M., Bulan, A. V., Chernov, D. V., Chiavassa, A., Dyachok, A. N., Gafarov, A. R., Garmash, A. Yu., Grebenyuk, V. M., Gress, O. A., Gress, T. I., Grinyuk, A. A., Grishin, O. G., Horns, D., Ivanova, A. L., Kalmykov, N. N., Kindin, V. V., Kiryuhin, S. N., Kokoulin, R. P., Kompaniets, K. G., Korosteleva, E. E., Kozhin, V. A., Kravchenko, E. A., Krivopalova, A. A., Kuzmichev, L. A., Kryukov, A. P., Lagutin, A. A., Lavrova, M. V., Lemeshev, Yu., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Lukanov, A. D., Mirgazov, R. R., Mirzoyan, R., Monkhoev, R. D., Osipova, E. A., Pakhorukov, A. L., Pan, A., Pankov, L. V., Petrukhin, A. A., Podgrudkov, D. A., Poleschuk, V. A., Popova, E. G., Porelli, A., Postnikov, E. B., Prosin, V. V., Ptuskin, V. S., Pushnin, A. A., Raikin, R. I., Razumov, A., Rjabov, E., Rubtsov, G. I., Sagan, Y. I., Samoliga, V. S., Sidorenkov, A. Yu., Silaev, A. A., Skurikhin, A. V., Satyshev, I., Sokolov, A. V., Suvorkin, Y., Sveshnikova, L. G., Tabolenko, V. A., Tanaev, A. B., Tarashansky, B. A., Ternovoy, M., Tkachev, L. G., Tluczykont, M., Ushakov, N., Vaidyanathan, A., Volchugov, P. A., Volkov, N. V., Voronin, D., Wischnewski, R., Yashin, I. I., Zagorodnikov, A. V., and Zhurov, D. P.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

A wide-angle Cerenkov array TAIGA-HiSCORE (FOV $\sim$0.6 sr), was originally created as a part of TAIGA installation for high-energy gamma-ray astronomy and cosmic ray physics. Array now consist on nearly 100 optical stations on the area of 1 km$^2$. Due to high accuracy and stability ($\sim$1 ns) of time synchronization of the optical stations the accuracy of EAS arrival direction reconstruction is reached 0.1$^\mathrm{o}$. It was proven that the array can also be used to search for nanosecond events of the optical range. The report discusses the method of searching for optical transients using the HiSCORE array and demonstrates its performance on a real example of detecting signals from an artificial Earth satellite. The search for this short flares in the HiSCORE data of the winter season 2018--2019 is carried out. One candidate for double repeater has been detected, but the estimated probability of random simulation of such a transient by background EAS events is not less than 10%, which does not allow us to say that the detected candidate corresponds to a real astrophysical transient. An upper bound on the frequency of optical spikes with flux density of more than $10^{-4} \mathrm{erg/s/cm}^2$ and a duration of more than 5\,ns is established as $\sim 2 \times 10^{-3}$ events/sr/hour., Comment: 15 pages, 6 figures, reported at the conference ISCRA-2021, Accepted for publication in Physics of Atomic Nuclei

Published
2021
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10. Relativistic dust grains: a new subject of research with orbital fluorescence detectors

Author

Khrenov, B. A., Kalmykov, N. N., Klimov, P. A., Sharakin, S. A., and Zotov, M. Yu.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

TUS (Tracking Ultraviolet Set-up) was the world's first orbital detector aimed at testing the principle of observing ultra-high energy cosmic rays (UHECRs) with a space-based fluorescence telescope. TUS was launched into orbit on 28th April 2016 as a part of the scientific payload of the Lomonosov satellite, and its mission continued for 1.5 years. During this time, its exposure reached $\sim1550$ km$^2$ sr yr for primary energy $\gtrsim400$ EeV, and a number of extensive air showers-like events were registered. The shape and kinematics of the signal in these events closely resembled those expected from UHECRs but amplitudes of the signal and some other features were in contradiction with this assumption. A detailed analysis of one of EAS-like events (TUS161003) revealed that a primary cosmic ray would need to have an energy $\gtrsim1$ ZeV in order to produce a light curve of the observed amplitude, which is incompatible with the cosmic ray spectrum obtained with ground-based experiments. More than this, the slant depth of the shower maximum be the signal produced by a cosmic particle, was estimated as $\lesssim500$ g/cm$^2$, which corresponds to cosmic rays around 1 PeV. We present a preliminary discussion of a hypothesis that the TUS161003 event and perhaps some other bright EAS-like events could be produced by relativistic dust grains, which were considered a possible component of the cosmic ray flux beyond the GZK cut-off some time ago., Comment: Proceedings of the 37th International Cosmic Ray Conference (ICRC 2021), Berlin, Germany

Published
2021
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12. Detection of TeV Emission from the Crab Nebula Using the First Two IACTs in TAIGA in Stereo Mode of Observation

Author

Volchugov, P. A., Astapov, I. I., Bezyazeekov, P. A., Bonvech, E. A., Borodin, A., Budnev, N., Bulan, A. V., Chiavassa, A., Chernov, D. V., Dyachok, A., Gafarov, A., Garmash, A., Grebenyuk, V., Gress, O., Gress, E., Gress, T., Grinyuk, A., Grishin, O., Ivanova, A. D., Ivanova, A. L., Ilushin, M., Kalmykov, N., Kindin, V., Kiryuhin, S., Kokoulin, R., Kolosov, N., Kompaniets, K., Korosteleva, E., Kozhin, V., Kravchenko, E., Kryukov, A., Kuzmichev, L., Lagutin, A., Lavrova, M., Lemeshev, Y. E., Lubsandorzhiev, B., Lubsandorzhiev, N., Malakhov, S. D., Mirgazov, R., Monkhoev, R., Osipova, E., Okuneva, E., Pakhorukov, A., Pan, A., Pankov, L., Panov, A. D., Petrukhin, A., Podgrudkov, D. A., Popova, E., Postnikov, E., Prosin, V., Ptuskin, V., Pushnin, A., Raikin, R., Razumov, A. Y., Rubtsov, G., Ryabov, E., Samoliga, V., Satyshev, I., Silaev, A., Silaev (junior), A., Sidorenkov, A., Skurikhin, A., Sokolov, A., Sveshnikova, L., Tabolenko, V., Tanaev, A. A., Ternovoy, M. Y., Tkachev, L., Ushakov, N., Vaidyanathan, A., Volkov, N. V., Voronin, D., Zagorodnikov, A., Yashin, I., and Zhurov, D.

Published
2023
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13. The TAIGA—a Hybrid Detector Complex in Tunka Valley for Astroparticle Physics, Cosmic Ray Physics and Gamma-Ray Astronomy

Author

Astapov, I., Bezyazeekov, P., Bonvech, E., Borodin, A., Budnev, N., Bulan, A., Chernov, D., Chiavassa, A., Dyachok, A., Gafarov, A., Garmash, A., Grebenyuk, V., Gress, E., Gress, O., Gress, T., Grinyuk, A., Grishin, O., Ivanova, A. D., Ivanova, A. L., Iliushin, M., Kalmykov, N., Kindin, V., Kiryuhin, S., Kokoulin, R., Kompaniets, K., Korosteleva, E., Kozhin, V., Kravchenko, E., Kryukov, A., Kuzmichev, L., Lagutin, A., Lavrova, M., Lemeshev, Y., Lubsandorzhiev, B., Lubsandorzhiev, N., Malakhov, S., Mirgazov, R., Monkhoev, R., Okuneva, E., Osipova, E., Pakhorukov, A., Pankov, L., Pan, A., Panov, A., Petrukhin, A., Podgrudkov, D., Popova, E., Postnikov, E., Prosin, V., Ptuskin, V., Pushnin, A., Raikin, R., Razumov, A., Rubtsov, G., Ryabov, E., Samoliga, V., Satyshev, I., Silaev, A., Silaev (junior), A., Sidorenkov, A., Skurikhin, A., Sokolov, A., Sveshnikova, L., Tabolenko, V., Tarashchansky, B., Tkachev, L., Tanaev, A., Ternovoy, M., Ushakov, N., Vaidyanathan, A., Volchugov, P., Volkov, N., Voronin, D., Zagorodnikov, A., Zhurov, D., and Yashin, I.

Published
2023
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14. Scintillation Experiment on the Study of Cosmic Rays and Gamma Fluxes in the Tunka Valley

Author

Ivanova, A. L., Astapov, I., Bezyazeekov, P., Bonvech, E., Borodin, A., Budnev, N., Bulan, A., Chernov, D., Chiavassa, A., Dyachok, A., Gafarov, A., Garmash, A., Grebenyuk, V., Gress, E., Gress, O., Gress, T., Grinyuk, A., Grishin, O., Ivanova, A. D., Iliushin, M., Kalmykov, N., Kindin, V., Kiryuhin, S., Kokoulin, R., Kompaniets, K., Korosteleva, E., Kozhin, V., Kravchenko, E., Kryukov, A., Kuzmichev, L., Lavrova, M., Lagutin, A., Lemeshev, Y., Lubsandorzhiev, B., Lubsandorzhiev, N., Malakhov, S., Mirgazov, R., Monkhoev, R., Okuneva, E., Osipova, E., Pakhorukov, A., Pankov, L., Pan, A., Panov, A., Petrukhin, A., Podgrudkov, D., Popova, E., Postnikov, E., Prosin, V., Ptuskin, V., Pushnin, A., Raikin, R., Razumov, A., Rubtsov, G., Ryabov, E., Samoliga, V., Satyshev, I., Silaev (junior), A., Sidorenkov, A., Skurikhin, A., Sokolov, A., Sveshnikova, L., Tabolenko, V., Tarashchansky, B., Tkachev, L., Tanaev, A., Ternovoy, M., Ushakov, N., Vaidyanathan, A., Volchugov, P., Volkov, N., Voronin, D., Zagorodnikov, A., Zhurov, D., and Yashin, I.

Published
2023
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15. Energy Spectrum of Gamma Rays from the Crab Nebula, According to Data from the TAIGA Astrophysical Complex

Author

Sveshnikova, L. G., Volchugov, P. A., Postnikov, E. B., Astapov, I. I., Bezyazeekov, P. A., Bonvech, E. A., Borodin, A. N., Budnev, N. M., Bulan, A. V., Vaidyanathan, A. A., Volkov, N. V., Voronin, D. M., Gafarov, A. R., Gress, E. O., Gress, O. A., Gress, T. I., Grishin, O. G., Garmash, A. Yu., Grebenyuk, V. M., Grinyuk, A. A., Dyachok, A. N., Zhurov, D. P., Zagorodnikov, A. V., Ivanova, A. D., Ivanova, A. L., Iliushin, M. A., Kalmykov, N. N., Kindin, V. V., Kiryuhin, S. N., Kokoulin, R. P., Kolosov, N. I., Kompaniets, K. G., Korosteleva, E. E., Kozhin, V. A., Kravchenko, E. A., Kryukov, A. P., Kuzmichev, L. A., Chiavassa, A., Lagutin, A. A., Lavrova, M. V., Lemeshev, Yu. E., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Malakhov, S. D., Mirgazov, R. R., Monkhoev, R. D., Okuneva, E. A., Osipova, E. A., Panov, A. D., Pakhorukov, A. L., Pan, A., Pankov, L. V., Petrukhin, A. A., Podgrudkov, D. A., Popova, E. G., Prosin, V. V., Ptuskin, V. S., Pushnin, A. A., Razumov, A. V., Raikin, R. I., Rubtsov, G. I., Ryabov, E. V., Samoliga, V. S., Satyshev, I., Silaev, A. A., Silaev, Jr., A. A., Sidorenkov, A. Yu., Skurikhin, A. V., Sokolov, A. V., Tabolenko, V. A., Tanaev, A. B., Tarashansky, B. A., Ternovoy, M. Yu., Tkachev, L. G., Ushakov, N. A., Chernov, D. V., and Yashin, I. I.

Published
2023
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16. Main Results from the TUNKA-GRANDE Experiment

Author

Monkhoev, R. D., Astapov, I. I., Bezyazeekov, P. A., Bonvech, E. A., Borodin, A. N., Budnev, N. M., Bulan, A. V., Vaidyanathan, A., Volkov, N. V., Volchugov, P. A., Voronin, D. M., Gafarov, A. R., Garmash, A. Yu., Grebenyuk, V. M., Gress, E. O., Gress, O. A., Gress, T. I., Grinyuk, A. A., Grishin, O. G., Dyachok, A. N., Zhurov, D. P., Zagorodnikov, A. V., Ivanova, A. D., Ivanova, A. L., Iliushin, M. A., Kalmykov, N. N., Kindin, V. V., Kiryuhin, S. N., Kokoulin, R. P., Kolosov, N. I., Kompaniets, K. G., Korosteleva, E. E., Kozhin, V. A., Kravchenko, E. A., Kryukov, A. P., Kuzmichev, L. A., Chiavassa, A., Lagutin, A. A., Lavrova, M. V., Lemeshev, Yu. E., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Malakhov, S. D., Mirgazov, R. R., Okuneva, E. A., Osipova, E. A., Pakhorukov, A. L., Pan, A., Panov, A. D., Pankov, L. V., Petrukhin, A. A., Podgrudkov, D. A., Popova, E. G., Postnikov, E. B., Prosin, V. V., Ptuskin, V. S., Pushnin, A. A., Razumov, A. Yu., Raikin, R. I., Rubtsov, G. I., Rjabov, E. V., Samoliga, V. S., Satyshev, I., Silaev, A. A., Silaev Jr., A. A., Sidorenkov, A. Yu., Skurikhin, A. V., Sokolov, A. V., Sveshnikova, L. G., Tabolenko, V. A., Tanaev, A. B., Tarashansky, B. A., Ternovoy, M. Yu., Tkachev, L. G., Ushakov, N. A., Chernov, D. V., and Yashin, I. I.

Published
2023
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17. The primary cosmic-ray energy spectrum measured with the Tunka-133 array

Author

Budnev, N. M., Chiavassa, A., Gress, O. A., Gress, T. I., Dyachok, A. N., Karpov, N. I., Kalmykov, N. N., Korosteleva, E. E., Kozhin, V. A., Kuzmichev, L. A., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Mirgazov, R. R., Osipova, E. A., Panasyuk, M. I., Pankov, L. V., Popova, E. G., Prosin, V. V., Ptuskin, V. S., Semeney, Yu. A., Silaev, A. A., Skurikhin, A. V., Spiering, C., and Sveshnikova, L. G.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

The EAS Cherenkov light array Tunka-133, with $\sim$ 3 km$^2$ geometric area, is taking data since 2009.The array permits a detailed study of energy spectrum and mass composition of cosmic rays in the energy range from $6\cdot 10^{15}$ to $10^{18}$ eV. We describe the methods of time and amplitude calibration of the array and the methods of EAS parameters reconstruction. We present the all-particle energy spectrum, based on 7 seasons of operation., Comment: 12 pages,18 figures

Published
2021
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18. Energy Spectrum of Primary Cosmic Rays According to the Data of the TAIGA Astrophysical Complex

Author

Prosin, V. V., Astapov, I. I., Bezyazeekov, P. A., Bonvech, E. A., Borodin, A. N., Budnev, N. M., Bulan, A. V., Chernov, D. V., Chiavassa, A., Dyachok, A. N., Gafarov, A. R., Garmash, A. Yu., Grebenyuk, V. M., Gress, E. O., Gress, O. A., Gress, T. I., Grinyuk, A. A., Grishin, O. G., Iliushin, M. A., Ivanova, A. D., Ivanova, A. L., Kalmykov, N. N., Kindin, V. V., Kiryuhin, S. N., Kokoulin, R. P., Kolosov, N. I., Kompaniets, K. G., Korosteleva, E. E., Kozhin, V. A., Kravchenko, E. A., Kryukov, A. P., Kuzmichev, L. A., Lagutin, A. A., Lavrova, M. V., Lemeshev, Yu. E., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Malakhov, S. D., Mirgazov, R. R., Monkhoev, R. A., Okuneva, E. A., Osipova, E. A., Pakhorukov, A. L., Pan, A., Panov, A. D., Pankov, L. V., Petrukhin, A. A., Podgrudkov, D. A., Popova, E. G., Postnikov, E. B., Ptuskin, V. S., Pushnin, A. A., Raikin, R. I., Razumov, A. V., Rjabov, E. V., Rubtsov, G. I., Samoliga, V. S., Satyshev, I., Sidorenkov, A. Yu., Silaev, A. A., Silaev, Jr., A. A., Skurikhin, A. V., Sokolov, A. V., Sveshnikova, L. G., Tabolenko, V. A., Tanaev, A. B., Tarashansky, B. A., Ternovoy, M. Yu., Tkachev, L. G., Ushakov, N. A., Vaidyanathan, A., Volkov, N. V., Volchugov, P. A., Voronin, D. M., Yashin, I. I., Zagorodnikov, A. V., and Zhurov, D. P.

Published
2023
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20. Tunka Advanced Instrument for cosmic rays and Gamma Astronomy

Author

Kostunin, D., Astapov, I., Bezyazeekov, P., Borodin, A., Budnev, N., Brückner, M., Chiavassa, A., Dyachok, A., Fedorov, O., Gafarov, A., Garmash, A., Grebenyuk, V., Gress, O., Gress, T., Grishin, O., Grinyuk, A., Haungs, A., Horns, D., Huege, T., Ivanova, A., Kalmykov, N., Kazarina, Y., Kindin, V., Kirilenko, P., Kiryuhin, S., Kleifges, M., Kokoulin, R., Kompaniets, K., Korosteleva, E., Kozhin, V., Kravchenko, E., Kuzmichev, A. Kryukov L., Lemeshev, Yu., Lagutin, A., Lenok, V., Lubsandorzhiev, B., Lubsandorzhiev, N., Marshalkina, T., Mirgazov, R., Mirzoyan, R., Monkhoev, R., Osipova, E., Pakhorukov, A., Pan, A., Panasyuk, M., Pankov, L., Petrukhin, A., Poleschuk, V., Popescu, M., Popova, E., Porelli, A., Postnikov, E., Prosin, V., Ptuskin, V., Pushnin, A., Raikin, R., Ryabov, E., Rubtsov, G., Sagan, Y., Sabirov, B., Samoliga, V., Semeney, Yu., Schröder, F. G., Silaev, A., Sidorenkov, A., Skurikhin, A., Slunecka, V., Sokolov, A., Spiering, C., Sveshnikova, L., Tabolenko, V., Tarashansky, B., Tkachev, L., Tluczykont, M., Ushakov, N., Volchugov, A. Vaidyanathan P., Voronin, D., Wischnewski, R., Zagorodnikov, A., Zhurov, D., Zurbanov, V., and Yashin, I.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The paper is a script of a lecture given at the ISAPP-Baikal summer school in 2018. The lecture gives an overview of the Tunka Advanced Instrument for cosmic rays and Gamma Astronomy (TAIGA) facility including historical introduction, description of existing and future setups, and outreach and open data activities., Comment: Lectures given at the ISAPP-Baikal Summer School 2018: Exploring the Universe through multiple messengers, 12-21 July 2018, Bol'shie Koty, Russia

Published
2019
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21. Report on Tests and Measurements of Hadronic Interaction Properties with Air Showers

Author

Dembinski, H. P., Arteaga-Velázquez, J. C., Cazon, L., Conceição, R., Gonzalez, J., Itow, Y., Ivanov, D., Kalmykov, N. N., Karpikov, I., Müller, S., Pierog, T., Riehn, F., Roth, M., Sako, T., Soldin, D., Takeishi, R., Thompson, G., Troitsky, S., Yashin, I., Zadeba, E., and Zhezher, Y.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Experiment
Abstract

We present a summary of recent tests and measurements of hadronic interaction properties with air showers. This report has a special focus on muon density measurements. Several experiments reported deviations between simulated and recorded muon densities in extensive air showers, while others reported no discrepancies. We combine data from eight leading air shower experiments to cover shower energies from PeV to tens of EeV. Data are combined using the z-scale, a unified reference scale based on simulated air showers. Energy-scales of experiments are cross-calibrated. Above 10 PeV, we find a muon deficit in simulated air showers for each of the six considered hadronic interaction models. The deficit is increasing with shower energy. For the models EPOS-LHC and QGSJet-II.04, the slope is found significant at 8 sigma., Comment: Submitted to the Proceedings of UHECR2018

Published
2019
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22. Muon content of extensive air showers: comparison of the energy spectra obtained by the Sydney University Giant Air-shower Recorder and by the Pierre Auger Observatory

Author

Bellido, J. A., Clay, R. W., Kalmykov, N. N., Karpikov, I. S., Rubtsov, G. I., Troitsky, S. V., and Ulrichs, J.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Phenomenology
Abstract

The Sydney University Giant Air-shower Recorder (SUGAR) measured the energy spectrum of ultra-high-energy cosmic rays reconstructed from muon-detector readings, while the Pierre Auger Observatory, looking at the same Southern sky, uses the calorimetric fluorescence method for the same purpose. Comparison of their two spectra allows us to reconstruct the empirical dependence of the number of muons in the shower on the primary energy for energies between $10^{17}$ and $10^{18.5}$ eV. We compare this dependence with the predictions of hadronic interaction models \mbox{QGSJET-II-04} and \mbox{EPOS-LHC}. The empirically determined number of muons with energies above 0.75 GeV exceeds the simulated one by the factors $\sim$1.67 and $\sim$1.28 for $10^{17}$ eV proton and iron primaries, respectively. The muon excess grows moderately with the primary energy, increasing by an additional factor of $\sim 1.2$ for $10^{18.5}$ eV primaries.

Published
2018
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23. TAIGA—A hybrid array for high energy gamma-ray astronomy and cosmic-ray physics

Author

Budnev, N., Astapov, I., Bezyazeekov, P., Bonvech, E., Borodin, A., Bulan, A., Chiavassa, A., Chernov, D., Dyachok, A., Gafarov, A., Garmash, A., Grebenyuk, V., Gress, O., Gress, E., Gress, T., Grinyuk, A., Grishin, O., Ivanova, A.D., Ivanova, A.L., Kalmykov, N., Kindin, V., Kiryuhin, S., Kokoulin, R., Komponiets, K., Korosteleva, E., Kozhin, V., Kravchenko, E., Kryukov, A., Kuzmichev, L., Lagutin, A., Lavrova, M., Lemeshev, Y., Lubsandorzhiev, B., Lubsandorzhiev, N., Lukanov, A., Lukyantsev, D., Malakhov, S., Mirgazov, R., Monkhoev, R., Okuneva, E., Osipova, E., Pakhorukov, A., Pan, A., Panasenko, L., Pankov, L., Panov, A.D., Petrukhin, A., Poddubny, I., Podgrudkov, D., Poleschuk, V., Ponomareva, V., Popova, E., Postnikov, E., Prosin, V., Ptuskin, V., Pushnin, A., Raikin, R., Razumov, A., Rubtsov, G., Ryabov, E., Sagan, Y., Samoliga, V., Silaev, A., Silaev, A., Junior, Sidorenkov, A., Skurikhin, A., Sokolov, A., Sveshnikova, L., Tabolenko, V., Tanaev, A., Tarashchansky, B., Ternovoy, M.Y., Tkachev, L., Togoo, R., Ushakov, N., Vaidyanathan, A., Volchugov, P., Volkov, N., Voronin, D., Zagorodnikov, A., Zhaglova, A., Zhurov, D., and Yashin, I.

Published
2022
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24. Cosmic-Ray Research at the TAIGA Astrophysical Facility: Results and Plans

Author

Astapov, I. I., Bezyazeekov, P. A., Blank, M., Bonvech, E. A., Borodin, A. N., Brückner, M., Budnev, N. M., Bulan, A. V., Vaidyanathan, A., Vishnevsky, R., Volkov, N. V., Volchugov, P. A., Voronin, D. M., Gafarov, A. R., Gress, O. A., Gress, T. I., Grishin, O. G., Garmash, A. Yu., Grebenyuk, V. M., Grinyuk, A. A., Dyachok, A. N., Zhurov, D. P., Zagorodnikov, A. V., Ivanova, A. L., Kalmykov, N. N., Kindin, V. V., Kiryukhin, S. N., Kokoulin, R. P., Kompaniets, K. G., Korosteleva, E. E., Kozhin, V. A., Kravchenko, E. A., Kryukov, A. P., Kuzmichev, L. A., Chiavassa, A., Lagutin, A. A., Lavrova, M. V., Lemeshev, Yu. E., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Mirgazov, R. R., Mirzoyan, R., Monkhoev, R. D., Osipova, E. A., Pakhorukov, A. L., Pan, A., Panasyuk, M. I., Pankov, L. V., Petrukhin, A. A., Podgrudkov, D. A., Poleshchuk, V. A., Popova, E. G., Porelli, A., Postnikov, E. B., Prosin, V. V., Ptuskin, V. S., Pushnin, A. A., Razumov, A. V., Raikin, R. I., Rubtsov, G. I., Ryabov, E. V., Sagan, Ya. I., Samoliga, V. S., Satyshev, I., Silaev, A. A., Silayev, Jr., A. A., Sidorenkov, A. Yu., Skurikhin, A. V., Sokolov, A. V., Sveshnikova, L. G., Suvorkin, Ya. V., Tabolenko, V. A., Tanaev, A. B., Tarashchansky, B. A., Ternovoi, M. Yu., Tkachev, L. G., Tluczykont, M., Ushakov, N. A., Horns, D., Chernov, D. V., and Yashin, I. I.

Published
2022
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25. Search for extreme energy cosmic ray candidates in the TUS orbital experiment data

Author

Biktemerova, S. V., Botvinko, A. A., Chirskaya, N. P., Eremeev, V. E., Garipov, G. K., Grebenyuk, V. M., Grinyuk, A. A., Jeong, S., Kalmykov, N. N., Kaznacheeva, M. A., Khrenov, B. A., Kim, M., Klimov, P. A., Lavrova, M. V., Lee, J., Martinez, O., Panasyuk, M. I., Park, I. H., Petrov, V. L., Ponce, E., Puchkov, A. E., Salazar, H., Saprykin, O. A., Senkovsky, A. N., Sharakin, S. A., Shirokov, A. V., Tkachenko, A. V., Tkachev, L. G., Yashin, I. V., and Zotov, M. Yu.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract

TUS (Track Ultraviolet Setup) is the first space experiment aimed to check the possibility of registering extreme energy cosmic rays (EECRs) at E>50 EeV by measuring the fluorescence signal of extensive air showers in the atmosphere. The detector operates as a part of the scientific payload of the Lomonosov satellite for more than a year. We describe an algorithm of searching for EECR events in the TUS data and briefly discuss a number of candidates selected by formal criteria., Comment: 13 pages

Published
2017

26. The TUS detector of extreme energy cosmic rays on board the Lomonosov satellite

Author

Klimov, P. A., Panasyuk, M. I., Khrenov, B. A., Garipov, G. K., Kalmykov, N. N., Petrov, V. L., Sharakin, S. A., Shirokov, A. V., Yashin, I. V., Zotov, M. Yu., Biktemerova, S. V., Grinyuk, A. A., Grebenyuk, V. M., Lavrova, M. V., Tkachev, L. G., Tkachenko, A. V., Park, I. H., Lee, J., Jeong, S., Martinez, O., Salazar, H., Ponce, E., Saprykin, O. A., Botvinko, A. A., Senkovsky, A. N., and Puchkov, A. E.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The origin and nature of extreme energy cosmic rays (EECRs), which have energies above the 50 EeV, the Greisen-Zatsepin-Kuzmin (GZK) energy limit, is one of the most interesting and complicated problems in modern cosmic-ray physics. Existing ground-based detectors have helped to obtain remarkable results in studying cosmic rays before and after the GZK limit, but have also produced some contradictions in our understanding of cosmic ray mass composition. Moreover, each of these detectors covers only a part of the celestial sphere, which poses problems for studying the arrival directions of EECRs and identifying their sources. As a new generation of EECR space detectors, TUS (Tracking Ultraviolet Set-up), KLYPVE and JEM-EUSO, are intended to study the most energetic cosmic-ray particles, providing larger, uniform exposures of the entire celestial sphere. The TUS detector, launched on board the Lomonosov satellite on April 28, 2016, from Vostochny Cosmodrome in Russia, is the first of these. It employs a single-mirror optical system and a photomultiplier tube matrix as a photo-detector and will test the fluorescent method of measuring EECRs from space. Utilizing the Earth's atmosphere as a huge calorimeter, it is expected to detect EECRs with energies above 100 EeV. It will also be able to register slower atmospheric transient events: atmospheric fluorescence in electrical discharges of various types including precipitating electrons escaping the magnetosphere and from the radiation of meteors passing through the atmosphere. We describe the design of the TUS detector and present results of different ground-based tests and simulations., Comment: 19 pages; v2: figures 6 and 9 replaced to match the published version

Published
2017
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27. First results from the TUS orbital detector in the extensive air shower mode

Author

Khrenov, B. A., Klimov, P. A., Panasyuk, M. I., Sharakin, S. A., Tkachev, L. G., Zotov, M. Yu., Biktemerova, S. V., Botvinko, A. A., Chirskaya, N. P., Eremeev, V. E., Garipov, G. K., Grebenyuk, V. M., Grinyuk, A. A., Jeong, S., Kalmykov, N. N., Kim, M., Lavrova, M. V., Lee, J., Martinez, O., Park, I. H., Petrov, V. L., Ponce, E., Puchkov, A. E., Salazar, H., Saprykin, O. A., Senkovsky, A. N., Shirokov, A. V., Tkachenko, A. V., and Yashin, I. V.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

TUS (Tracking Ultraviolet Set-up), the first orbital detector of extreme energy cosmic rays (EECRs), those with energies above 50 EeV, was launched into orbit on April 28, 2016, as a part of the Lomonosov satellite scientific payload. The main aim of the mission is to test a technique of registering fluorescent and Cherenkov radiation of extensive air showers generated by EECRs in the atmosphere with a space telescope. We present preliminary results of its operation in a mode dedicated to registering extensive air showers in the period from August 16, 2016, to November 4, 2016. No EECRs have been conclusively identified in the data yet, but the diversity of ultraviolet emission in the atmosphere was found to be unexpectedly rich. We discuss typical examples of data obtained with TUS and their possible origin. The data is important for obtaining more accurate estimates of the nocturnal ultraviolet glow of the atmosphere, necessary for successful development of more advanced orbital EECR detectors including those of the KLYPVE (K-EUSO) and JEM-EUSO missions., Comment: 18 pages; v2: references fixed; v3: minor changes to address referee's comments

Published
2017
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28. First results of the Lomonosov TUS and GRB experiments

Author

Biktemerova, S. V., Bogomolov, A. V., Bogomolov, V. V., Botvinko, A. A., Castro-Tirado, A. J., Gorbovskoy, E. S., Chirskaya, N. P., Eremeev, V. E., Garipov, G. K., Grebenyuk, V. M., Grinyuk, A. A., Iyudin, A. F., Jeong, S., Jeong, H. M., Jioeva, N. L., Kazarjan, P. S., Kalmykov, N. N., Kaznacheeva, M. A., Khrenov, B. A., Kim, M. B., Klimov, P. A., Kuznetsova, E. A., Lavrova, M. V., Lee, J., Lipunov, V. M., Martinez, O., Mjagkova, I. N., Panasyuk, M. I., Park, I. H., Petrov, V. L., Ponce, E., Puchkov, A. E., Salazar, H., Saprykin, O. A., Senkovsky, A. N., Sharakin, S. A., Shirokov, A. V., Svertilov, S. I., Tkachenko, A. V., Tkachev, L. G., Yashin, I. V., and Zotov, M. Yu.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

On April 28, 2016, the Lomonosov satellite, equipped with a number of scientific instruments, was launched into orbit. Here we present briefly some of the results obtained with the first orbital telescope of extreme energy cosmic rays TUS and by a group of detectors aimed at multi-messenger observations of gamma-ray bursts., Comment: XXV ECRS 2016 Proceedings - eConf C16-09-04.3

Published
2017

29. Constraints on the flux of $\sim (10^{16} - 10^{17.5})$ eV cosmic photons from the EAS-MSU muon data

Author

Fomin, Yu. A., Kalmykov, N. N., Karpikov, I. S., Kulikov, G. V., Kuznetsov, M. Yu., Rubtsov, G. I., Sulakov, V. P., and Troitsky, S. V.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

Results of the search for $\sim (10^{16} - 10^{17.5})$ eV primary cosmic-ray photons with the data of the Moscow State University (MSU) Extensive Air Shower (EAS) array are reported. The full-scale reanalysis of the data with modern simulations of the installation does not confirm previous indications of the excess of gamma-ray candidate events. Upper limits on the corresponding gamma-ray flux are presented. The limits are the most stringent published ones at energies $\sim 10^{17}$ eV.

Published
2017
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30. Astroclimate of the High Mountain Plains of the Greater Altai, According to Satellite Remote Sensing Data: Potential for Deploying a Full-Scale Gamma Astronomy Experiment

Author

Mordvin, E. Yu., Volkov, N. V., Revyakin, A. I., Togoo, R., Astapov, I. I., Bezyazeekov, P. A., Blank, M., Bonvech, E. A., Borodin, A. N., Bruchner, M., Budnev, N. M., Bulan, A., Vaidyanathan, A., Wischnewski, R., Volchugov, P. A., Voronin, D. M., Garmash, A. Yu., Gafarov, A. R., Grebenyuk, V. M., Gress, O. A., Gress, T. I., Grinyuk, A. A., Grishin, O. G., Dyachok, A. N., Zhurov, D. P., Zagorodnikov, A. V., Ivanova, A. L., Kalmykov, N. N., Kindin, V. V., Kiryuhin, S. N., Kokoulin, R. P., Kompaniets, K. G., Korosteleva, E. E., Kozhin, V. A., Kravchenko, E. A., Kryukov, A. P., Kuzmichev, L. A., Chiavassa, A., Lagutin, A. A., Lemeshev, Yu. E., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Mirgazov, R. R., Mirzoyan, R., Monkhoev, R. D., Osipova, E. A., Pakhorukov, A. L., Pan, A., Panasyuk, M. I., Pankov, L. V., Petrukhin, A. A., Podgrudkov, D. A., Poleschuk, V. A., Popescu, M., Popova, E. G., Porelli, A., Postnikov, E. B., Prosin, V. V., Ptuskin, V. S., Pushnin, A. A., Raikin, R. I., Rubtsov, G. I., Ryabov, E. V., Sagan, Y. I., Samoliga, V. S., Sveshnikova, L. G., Silaev, A. A., Silaev, Jr., A. A., Sidorenkov, A. Yu., Skurikhin, A. V., Slunecka, M., Sokolov, A. V., Suvorkin, Ya. V., Tabolenko, V. A., Tanaev, A. B., Tarashansky, B. A., Ternovoy, M. Yu., Tkachev, L. G., Tluczykont, M., Ushakov, N. A., Horns, D., Chernov, D. V., and Yashin, I. I.

Published
2022
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31. Energy Spectrum and Mass Composition of Cosmic Rays from the Data of the Astrophysical Complex TAIGA

Author

Prosin, V., Astapov, I., Bezyazeekov, P., Borodin, A., Brückner, M., Budnev, N., Bulan, A., Chiavassa, A., Dyachok, A., Gafarov, A., Garmash, A., Grebenyuk, V., Gress, O., Gress, T., Grinyuk, A., Grishin, O., Horns, D., Ivanova, A., Kalmykov, N., Kindin, V., Kiryuhin, S., Kokoulin, R., Kompaniets, K., Korosteleva, E., Kozhin, V., Kravchenko, E., Kryukov, A., Kuzmichev, L., Lagutin, A., Lavrova, M., Lemeshev, Yu., Lubsandorzhiev, B., Lubsandorzhiev, N., Mirgazov, R., Mirzoyan, R., Monkhoev, R., Osipova, E., Pakhorukov, A., Pan, A., Pankov, L., Poleschuk, V., Popesku, M., Popova, E., Porelli, A., Postnikov, E., Ptuskin, V., Petrukhin, A., Pushnin, A., Raikin, R., Rjabov, E., Rubtsov, G., Sagan, Y., Samoliga, V., Sidorenkov, A., Silaev, A., Silaev, Jr., A., Skurikhin, A., Slunecka, M., Sokolov, A., Sveshnikova, L., Suvorkin, Y., Tabolenko, V., Tanaev, A., Tarashansky, B., Ternovoy, M., Tkachev, L., Tluczykont, M., Ushakov, N., Vaidyanathan, A., Volchugov, P., Voronin, D., Wischnewski, R., Yashin, I., Zagorodnikov, A., and Zhurov, D.

Published
2021
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32. Status and First Results of TAIGA

Author

Tluczykont, M., Astapov, I. I., Awad, A. K., Bezyazeekov, P. A., Blank, M., Bonvech, E. A., Borodin, A. N., Bulan, A. V., Brückner, M., Budnev, N. M., Chiavassa, A., Chernov, D. V., Dyachok, A. N., Gafarov, A. R., Garmash, A. Yu., Grebenyuk, V. M., Gress, O. A., Gress, E., Gress, T. I., Grishin, O. G., Grinyuk, A. A., Horns, D., Ivanova, A. L., Kalmykov, N. N., Kindin, V. V., Kiryuhin, S. N., Kokoulin, R. P., Kompaniets, K. G., Korosteleva, E. E., Kozhin, V. A., Kravchenko, E. A., Kryukov, A. P., Kuzmichev, L. A., Lagutin, A. A., Lavrova, M., Lemeshev, Yu. E., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Lukanov, A. D., Lukyantsev, D. S., Mirgazov, R. R., Mirzoyan, R., Monkhoev, R. D., Osipova, E. A., Pakhorukov, A. L., Pan, A., Panasenko, L. A., Pankov, L. V., Panov, A. D., Petrukhin, A. A., Podgrudkov, D. A., Poleschuk, V. A., Popova, E. G., Porelli, A., Postnikov, E. B., Prosin, V. V., Ptuskin, V. S., Pushnin, A. A., Raikin, R. I., Razumov, A. Y., Rubtsov, G. I., Ryabov, E. V., Sagan, Y. I., Samoliga, V. S., Semeney, Yu. A., Silaev, A. A., Silaev, Jr., A. A., Sidorenkov, A. Yu., Skurikhin, A. V., Slunecka, M., Sokolov, A. V., Suvorkin, Y., Sveshnikova, L. G., Tabolenko, V. A., Tanaev, A. B., Tarashansky, B. A., Ternovoy, M., Tkachev, L. G., Ushakov, N., Vaidyanathan, A., Volchugov, P. A., Volkov, N. V., Voronin, D., Wischnewski, R., Yashin, I. I., Zagorodnikov, A. V., and Zhurov, D. P.

Published
2021
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33. Cosmic Ray Study at the Astrophysical Complex TAIGA: Results and Plans

Author

Kuzmichev, L. A., Astapov, I. I., Bezyazeekov, P. A., Blank, M., Bonvech, E. A., Borodin, A. N., Brueckner, M., Budnev, N. M., Bulan, A. V., Chernov, D. V., Chiavassa, A., Dyachok, A. N., Gafarov, A. R., Garmash, A. Yu., Grebenyuk, V. M., Gress, O. A., Gress, T. I., Grinyuk, A. A., Grishin, O. G., Horns, D., Ivanova, A. L., Kalmykov, N. N., Kindin, V. V., Kiryuhin, S. N., Kokoulin, R. P., Kompaniets, K. G., Korosteleva, E. E., Kozhin, V. A., Kravchenko, E. A., Kryukov, A. P., Lagutin, A. A., Lavrova, M. V., Lemeshev, Yu., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Lukanov, A. D., Lukyantsev, D., Mirgazov, R. R., Mirzoyan, R., Monkhoev, R. D., Osipova, E. A., Pakhorukov, A. L., Pan, A., Pankov, L. V., Panov, A. D., Petrukhin, A. A., Podgrudkov, D. A., Poleschuk, V. A., Popova, E. G., Porelli, A., Postnikov, E. B., Prosin, V. V., Ptuskin, V. S., Pushnin, A. A., Raikin, R. I., Razumov, A., Rjabov, E., Rubtsov, G. I., Sagan, Y. I., Samoliga, V. S., Sidorenkov, A. Yu., Silaev, A. A., Silaev, Jr., A. A., Skurikhin, A. V., Slunecka, M., Sokolov, A. V., Suvorkin, Y., Sveshnikova, L. G., Tabolenko, V. A., Tanaev, A. B., Tarashansky, B. A., Ternovoy, M., Tkachev, L. G., Tluczykont, M., Ushakov, N., Vaidyanathan, A., Volchugov, P. A., Volkov, N. V., Voronin, D., Wischnewski, R., Yashin, I. I., Zagorodnikov, A. V., and Zhurov, D. P.

Published
2021
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34. No muon excess in extensive air showers at 100-500 PeV primary energy: EAS-MSU results

Author

Fomin, Yu. A., Kalmykov, N. N., Karpikov, I. S., Kulikov, G. V., Kuznetsov, M. Yu., Rubtsov, G. I., Sulakov, V. P., and Troitsky, S. V.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

Some discrepancies have been reported between observed and simulated muon content of extensive air showers: the number of observed muons exceeded the expectations in HiRes-MIA, Yakutsk and Pierre Auger Observatory data. Here, we analyze the data of the Moscow State University Extensive Air Shower (EAS-MSU) array on E_mu>~10 GeV muons in showers caused by ~(10^17-10^18) eV primary particles and demonstrate that they agree with simulations (QGSJET-II-04 hadronic interaction model) once the primary composition inferred from the surface-detector data is assumed., Comment: 10 pages, 6 figures, elsart.sty. V2: extended discussion of systematic errors, numerous clarifications (results unchanged). V3: minor changes, version accepted by Astroparticle Physics

Published
2016
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35. Full Monte-Carlo description of the Moscow State University Extensive Air Shower experiment

Author

Fomin, Yu. A., Kalmykov, N. N., Karpikov, I. S., Kulikov, G. V., Kuznetsov, M. Yu., Rubtsov, G. I., Sulakov, V. P., and Troitsky, S. V.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The Moscow State University Extensive Air Shower (EAS-MSU) array studied high-energy cosmic rays with primary energies ~(1-500) PeV in the Northern hemisphere. The EAS-MSU data are being revisited following recently found indications to an excess of muonless showers, which may be interpreted as the first observation of cosmic gamma rays at ~100 PeV. In this paper, we present a complete Monte-Carlo model of the surface detector which results in a good agreement between data and simulations. The model allows us to study the performance of the detector and will be used to obtain physical results in further studies., Comment: V2: some clarifications added; matches the published version. 23 pages, 12 figures (18 panels)

Published
2016
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36. Regions of an excessive flux of cosmic rays according to data of the FIAN and MSU arrays

Author

Gudkova, E. N., Zotov, M. Yu., Kalmykov, N. N., Kulikov, G. V., Nesterova, N. M., and Pavlyuchenko, V. P.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

Results of a blind search for localized regions of an excessive flux of cosmic rays in the energy range from 50 TeV to 20 PeV with the data of the FIAN KLARA-Chronotron experiment, the EAS MSU array and the Prototype of the EAS-1000 array are presented. A number of regions with a significant excess of the registered flux over an expected isotropic background are found. Some of the regions are present in at least two of the data sets considered., Comment: 5 pages, 2 figures; to be published in the proceedings of the 33rd Russian Cosmic Ray Conference (Dubna, 11-15 August, 2014)

Published
2015
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37. TAIGA—An Innovative Hybrid Array for High Energy Gamma Astronomy, Cosmic Ray Physics and Astroparticle Physics

Author

Budnev, N., Astapov, I., Bezyazeekov, P., Bonvech, E., Borodin, A., Brückner, M., Bulan, A., Chernov, D., Chiavassa, A., Dyachok, A., Gafarov, A., Garmash, A., Grebenyuk, V., Gress, O., Gress, T., Grinyuk, A., Grishin, O., Horns, D., Ivanova, Al., Ivanova, A., Kalmykov, N., Kindin, V., Kiryuhin, S., Kokoulin, R., Kompaniets, K., Korosteleva, E., Kotovschikov, I., Kozhin, V., Kravchenko, E., Kryukov, A., Kuzmichev, L., Lagutin, A., Lemeshev, Yu., Lubsandorzhiev, B., Lubsandorzhiev, N., Lukyantsev, D., Mirgazov, R., Mirzoyan, R., Monkhoev, R., Osipova, E., Pakhorukov, A., Pan, A., Panasyuk, M., Pankov, L., Podgrudkov, D., Poleschuk, V., Popova, E., Porelli, A., Postnikov, E., Prosin, V., Ptuskin, V., Petrukhin, A., Pushnin, A., Raikin, R., Rjabov, E., Rubtsov, G., Sagan, Y., Samoliga, V., Sidorenkov, A., Silaev, A., Silaev, Jr., A., Skurikhin, A., Slunecka, M., Sokolov, A., Sveshnikova, L., Suvorkin, Y., Tabolenko, V., Tanaev, A., Tarashansky, B., Ternovoy, M., Tkachev, L., Tluczykont, M., Togoo, R., Ushakov, N., Volchugov, P., Voronin, D., Wischnewski, R., Yashin, I., Zagorodnikov, A., Zhaglova, A., and Zhurov, D.

Published
2021
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38. Detecting Gamma Rays with Energies Greater than 3–4 ТeV from the Crab Nebula and Blazar Markarian 421 by Imaging Atmospheric Cherenkov Telescopes in the TAIGA Experiment

Author

Sveshnikova, L. G., Astapov, I. I., Bezyazeekov, P. A., Blank, M., Borodin, A. N., Brückner, M., Budnev, N. M., Bulan, A., Vaidyanathan, A., Wischnewski, R., Volchugov, P., Voronin, D., Gafarov, A. R., Garmash, A. Yu., Grebenyuk, V. M., Gress, O. A., Gress, T. I., Grinyuk, A. A., Grishin, O. G., Dyachok, A. N., Zhurov, D. P., Zagorodnikov, A. V., Ivanova, A. L., Kalmykov, N. N., Kindin, V. V., Kiryukhin, S. N., Kozhin, V. A., Kokoulin, R. P., Kompaniets, K. G., Korosteleva, E. E., Kravchenko, E. A., Kryukov, A. P., Kuzmichev, L. A., Chiavassa, A., Lavrova, M., Lagutin, A. A., Lemeshev, Yu., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Mirgazov, R. R., Mirzoyan, R., Monkhoev, R. D., Osipova, E. A., Pan, A., Panasyuk, M. I., Pankov, L. V., Pakhorukov, A. L., Petrukhin, A. A., Poleschuk, V. A., Popesku, M., Popova, E. G., Porelli, A., Postnikov, E. B., Prosin, V. V., Ptuskin, V. S., Pushnin, A. A., Raikin, R. I., Rubtsov, G. I., Rjabov, E. V., Sagan, Ya. I., Samoliga, V. S., Sidorenkov, A. Yu., Silaev, A. A., Silaev, Jr., A. A., Skurikhin, A. V., Slunecka, M., Sokolov, A. V., Suvorkin, Ya., Tabolenko, V. A., Tanaev, A., Tarashansky, B. A., Ternovoy, M., Tkachev, L. G., Tluczykont, M., Ushakov, N., Horns, D., and Yashin, I. I.

Published
2021
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39. First Results from Operating a Prototype Wide-Angle Telescope for the TAIGA Installation

Author

Podgrudkov, D. A., Bonvech, E. A., Vaiman, I. V., Chernov, D. V., Astapov, I. I., Bezyazeekov, P. A., Blank, M., Borodin, A. N., Brückner, M., Budnev, N. M., Bulan, A. V., Vaidyanathan, A., Wischnewski, R., Volchugov, P. A., Voronin, D. M., Gafarov, A. R., Gress, O. A., Gress, T. I., Grishin, O. G., Garmashi, A. Yu., Grebenyuk, V. M., Grinyuk, A. V., Dyachok, A. N., Zhurov, D. P., Zagorodnikov, A. V., Ivanova, A. L., Kalmykov, N. N., Kindin, V. V., Kiryuhin, S. N., Kokoulin, R. L., Kompaniets, K. G., Korosteleva, E. E., Kozhin, V. A., Kravchenko, E. A., Kryukov, A. P., Kuzmichev, L. A., Chiavassa, A., Lavrova, M., Lagutin, A. A., Lemeshev, Yu. E., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Mirgazov, R. R., Mirzoyan, R., Monkhoev, R. D., Osipova, E. A., Pakhorukov, A. L., Pan, A., Panasyuk, M. I., Pankov, L. V., Petrukhin, A. A., Poleschuk, V. A., Popesku, M., Popova, E. G., Porelli, A., Postnikov, E. B., Prosin, V. V., Ptuskin, V. S., Pushnin, A. A., Raikin, R. I., Rubtsov, G. I., Ryabov, E. V., Sagan, Ya. I., Samoliga, V. S., Silaev, A. A., Silaev, Jr., A. A., Sidorenkov, A. Yu., Skurikhin, A. V., Slunecka, M., Sokolov, A. V., Sveshnikova, L. G., Suvorkin, Ya. V., Tabolenko, V. A., Tanaev, A. V., Tarashansky, B. A., Ternovoy, M. Yu., Tkachev, L. G., Tluczykont, M., Ushakov, N. A., Horns, D., and Yashin, I. V.

Published
2021
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40. TAIGA—A hybrid array for high-energy gamma astronomy and cosmic-ray physics

Author

Budnev, N., Astapov, I.I., Bezyazeekov, P.A., Borodin, A., Brückner, M., Chernykh, D., Chiavassa, A., Dyachok, A., Fedorov, O., Gafarov, A., Garmash, A., Grebenyuk, V., Gress, O., Gress, T., Grinyuk, A., Grishin, O., Horns, D., Ivanova, A., Kalmykov, N., Kazarina, Yu., Kindin, V., Kiryuhin, S., Kokoulin, R., Komponiets, K., Korosteleva, E., Kostunin, D., Kozhin, V., Kravchenko, E., Kryukov, A., Kuzmichev, L., Lagutin, A., Lubsandorzhiev, B., Lubsandorzhiev, N., Mirgazov, R., Mirzoyan, R., Monkhoev, R., Osipova, E., Pakhorukov, A., Pan, A., Panasyuk, M., Pankov, L., Petrukhin, A., Poleschuk, V., Popesku, M., Popova, E., Porelli, A., Postnikov, E., Prosin, V., Ptuskin, V., Pushnin, A., Raikin, R., Rubtsov, G., Ryabov, E., Sagan, Y., Samoliga, V., Silaev, A., Silaev, A., junior, Sidorenkov, A., Skurikhin, A., Slunecka, M., Sokolov, A., Spiering, C., Sveshnikova, L., Suvorkin, Y., Tabolenko, V., Tarashchansky, B., Tkachev, L., Tluczykont, M., Ushakov, N., Ustinov, K., Vaidyanathan, A., Voronin, D., Wischnewski, R., Zagorodnikov, A., Zurbanov, V., Zhurov, D., and Yashin, I.

Published
2020
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41. Cherenkov EAS arrays in the Tunka astrophysical center: From Tunka-133 to the TAIGA gamma and cosmic ray hybrid detector

Author

Kuzmichev, L., Astapov, I., Bezyazeekov, P., Borodin, A., Brückner, M., Budnev, N., Chiavassa, A., Gress, O., Gress, T., Grishin, O., Dyachok, A., Fedorov, O., Gafarov, A., Garmash, A., Grebenyuk, V., Grinyuk, A., Horns, D., Kalmykov, N., Kazarina, Y., Kindin, V., Kiryuhin, V., Kirilenko, P., Kokoulin, R., Kompaniets, K., Korosteleva, E., Kozhin, V., Kravchenko, E., Kryukov, A., Lagutin, A., Lenok, V., Lubsandorzhiev, B., Lubsandorzhiev, N., Mirgazov, R., Mirzoyan, R., Monkhoev, R., Osipova, E., Pakharukov, A., Pan, A., Panasyuk, M., Pankov, L., Petrukhin, A., Poleschuk, V., Popesku, M., Popova, E., Porelli, A., Postnikov, E., Prosin, V., Ptuskin, V., Pushnin, A., Raikin, R., Rubtsov, G., Ryabov, E., Sagan, Y., Samoliga, V., Semeney, Yu., Silaev, A., Silaev, A., Jr., Sidorenkov, A., Skurikhin, A., Slunecka, M., Sokolov, A., Spiering, C., Sveshnikova, L., Tabolenko, V., Tarashansky, B., Tkachenko, A., Tkachev, L., Tluczykont, M., Ushakov, N., Voronin, D., Wischnewski, R., Zagorodnikov, A., Zhurov, D., Zurbanov, V., and Yashin, I.

Published
2020
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42. Optimization of electromagnetic and hadronic extensive air shower identification using the muon detectors of the TAIGA experiment

Author

Astapov, I., Bezyazeekov, P., Boreyko, V., Borodin, A., Brueckner, M., Budnev, N., Chiavassa, A., Dyachok, A., Fedorov, O., Gafarov, A., Garmash, A., Gorbunov, N., Grebenyuk, V., Gress, O., Gress, T., Grishin, O., Grinyuk, A., Horns, D., Ivanova, A., Kalmykov, N., Kazarina, Y., Kindin, V., Kirilenko, P., Kiryuhin, S., Kokoulin, R., Kompaniets, K., Korosteleva, E., Kozhin, V., Kravchenko, E., Krykov, A., Kunnas, M., Kuzmichev, L., Lagutin, A.A., Lemeshev, Yu., Lenok, V., Lubsandorzhiev, B., Lubsandorzhiev, N., Mirgazov, R., Mirzoyan, R., Monkhoev, R., Nachtigall, R., Osipova, E., Pakhorukov, A., Panasyuk, M., Pankov, L., Petrukhin, A., Poleschuk, V., Popescu, M., Popova, E., Porelli, A., Postnikov, E., Prosin, V., Ptuskin, V., Pushnin, A., Rjabov, E., Rubtsov, G., Raikin, R.I., Sagan, Y., Sabirov, B., Samoliga, V., Semeney, Yu., Sidorenkov, A., Silaev, A., Silaev, A., Junior, Skurikhin, A., Slunecka, V., Sokolov, A., Spiering, C., Sveshnikova, L., Tabolenko, V., Tarashansky, B., Tkachenko, A., Tkachev, L., Tluczykont, M., Ushakov, N., Vaidyanathan, A., Voronin, D., Wischnewski, R., Zagorodnikov, A., Zhurov, D., Zurbanov, V., and Yashin, I.

Published
2020
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43. Estimates of the cosmic gamma-ray flux at PeV to EeV energies from the EAS-MSU experiment data

Author

Fomin, Yu. A., Kalmykov, N. N., Kulikov, G. V., Sulakov, V. P., and Troitsky, S. V.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

Archival EAS-MSU data are searched for anomalous muonless events which may be caused by primary gamma rays with energies between 10^15 eV and 10^18 eV. We consider a refined sample of high-quality data and confirm the previously reported detection of a non-zero gamma-ray flux at ~5x10^16 eV with a similar flux value but at somewhat lower statistical significance, corresponding to the depletion of the sample. We present upper limits on the flux below and above these energies, including the first constraints in the range (10^17-10^18) eV never studied by any other experiment., Comment: 4 pages, 3 figures, jetpl.cls style. V.2: a reference corrected

Published
2014
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44. Experimental Complex TAIGA

Author

Kuzmichev, L., Astapov, I., Bezyazykov, P., Blank, M., Borodin, A., Bonvech, A., Brückner, M., Bulan, A., Vaidyanathan, A., Wischnewski, R., Volchugov, P., Voronin, D., Gafarov, A., Gress, O., Gress, T., Grishin, O., Garmash, A., Grebenyuk, V., Grinyuk, A., Dyachok, A., Zhurov, D., Zagorodnikov, A., Ivanova, A., Kalmykov, N., Kazarina, Yu., Kindin, V., Kiryukhin, V., Kokoulin, R., Kompaniets, K., Korosteleva, E., Kozhin, V., Kravchenko, E., Kryukov, A., Chiavassa, A., Lagutin, A., Lemeshev, Yu., Lubsandorzhiev, B, Lubsandorzhiev, N., Mirgazov, R., Mirzoyan, R., Monkhoev, R., Osipova, E., Pakhorukov, A., Pan, A., Panasyuk, M., Pankov, L., Petrukhin, A., Podgrudkov, D., Poleshchuk, V., Popesku, M., Popova, E., Porelli, A., Postnikov, E., Prosin, V., Ptuskin, V., Pushnin, A., Raikin, R., Rubtsov, G., Rjabov, E., Sagan, Ya., Samoliga, V., Silaev, A., Silaev, Jr., A., Sidorenkov, A., Skurikhin, A., Slunechka, M., Sokolov, A., Sveshnikova, L., Suvorkin, Ya., Tabolenko, V., Tanaev, A., Tarashchansky, B., Ternovoy, M., Tkachev, L., Tluczykont, M., Ushakov, N., Fedorov, O., Horns, D., Chernov, D., Chernykh, D., Shipilov, D., and Yashin, I.

Published
2020
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45. Status of the TAIGA Experiment: From Cosmic-Ray Physics to Gamma Astronomy in Tunka Valley

Author

Budnev, N., Astapov, I., Bezyazeekov, P., Bonvech, A., Borodin, A., Brueckner, M., Bulan, A., Chernov, D., Chernykh, D., Chiavassa, A., Dyachok, A., Fedorov, O., Gafarov, A., Garmash, A., Grebenyuk, V., Gress, O., Gress, T., Grinyuk, A., Grishin, O., Haungs, A., Horns, D., Huege, T., Ivanova, A., Kalmykov, N., Kazarina, Y., Kindin, V., Kiryuhin, V., Kleifges, M., Kokoulin, R., Kompaniets, K., Korosteleva, E., Kostyunin, D., Kozhin, V., Kravchenko, E., Kryukov, A., Kuzmichev, L., Lagutin, A., Lemeshev, Yu., Lenok, V., Lubsandorzhiev, B., Lubsandorzhiev, N., Malakhov, S., Marshalkina, T., Mirgazov, R., Mirzoyan, R., Monkhoev, R., Osipova, E., Pakhorukov, A., Pan, A., Panasyuk, M., Pankov, L., Petrukhin, A., Podgrudkov, D., Poleschuk, V., Popova, E., Porelli, A., Postnikov, E., Prosin, V., Ptuskin, V., Pushnin, A., Raikin, R., Rubtsov, G., Ryabov, E., Sagan, Y., Samoliga, V., Schroder, F. G., Shipilov, D., Sidorenkov, A., Silaev, A., Silaev, Jr., A., Skurikhin, A., Slunecka, M., Sokolov, A., Sveshnikova, L., Suvorkin, Y., Tabolenko, V., Tanaev, A., Tarashchansky, B., Ternovoy, M., Tkachev, L., Tluczykont, M., Togoo, R., Ushakov, N., Vaidyanathan, A., Volchugov, P., Voronin, D., Wischnewski, R., Zagorodnikov, A., Zhurov, D., and Yashin, Ig.

Published
2020
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46. Estimate of the fraction of primary photons in the cosmic-ray flux at energies ~10^17 eV from the EAS-MSU experiment data

Author

Fomin, Yu. A., Kalmykov, N. N., Kulikov, G. V., Sulakov, V. P., and Troitsky, S. V.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Phenomenology
Abstract

We reanalyze archival EAS-MSU data in order to search for events with anomalously low content of muons with energies E_mu>10 GeV in extensive air showers with number of particles N_e>2*10^7. We confirm the first evidence for nonzero flux of primary cosmic gamma rays at energies E~10^17 eV. The estimated fraction of primary gamma rays in the flux of cosmic particles with energies E>5.4*10^16 eV is (0.43 +0.12-0.11)%, which corresponds to the intensity of (1.2 +0.4-0.3)*10^{-16} cm^{-2} s^{-1} sr^{-1}. The study of arrival directions does not favour any particular mechanism of the origin of the photon-like events., Comment: 20 pages, 12 figures. V2: important misprints corrected (there was a mismatch in numbers between the abstract and the main text, sorry). Version to appear in JETP in December 2013

Published
2013
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47. Depth of the Maximum of Extensive Air Showers (EASes) and the Mean Mass Composition of Primary Cosmic Rays in the 1015–1018 eV Range of Energies, According to Data from the TUNKA-133 and TAIGA-HiSCORE Arrays for Detecting EAS Cherenkov Light in the Tunkinsk Valley

Author

Prosin, V. V., Astapov, I. I., Bezyazeekov, P. A., Borodin, A. N., Brückner, M., Budnev, N. M., Bulan, A., Vaidyanathan, A., Wischnewski, R., Volchugov, P., Voronin, D., Gafarov, A. R., Garmash, A. Yu., Grebenyuk, V. M., Gress, O. A., Gress, T. I., Grinyuk, A. A., Grishin, O. G., Dyachok, A. N., Zhurov, D. P., Zagorodnikov, A. V., Ivanova, A. L., Kalmykov, N. N., Kindin, V. V., Kiryuhin, S. N., Kozhin, V. A., Kokoulin, R. P., Kompaniets, K. G., Korosteleva, E. E., Kravchenko, E. A., Kryukov, A. P., Kuzmichev, L. A., Chiavassa, A., Lavrova, M., Lagutin, A. A., Lemeshev, Yu., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Mirgazov, R. R., Mirzoyan, R., Monkhoev, R. D., Osipova, E. A., Pan, A., Panasyuk, M. I., Pankov, L. V., Pakhorukov, A. L., Petrukhin, A. A., Poleschuk, V. A., Popesku, M., Popova, E. G., Porelli, A., Postnikov, E. B., Ptuskin, V. S., Pushnin, A. A., Raikin, R. I., Rubtsov, G. I., Ryabov, E. V., Sagan, Ya. I., Samoliga, V. S., Sveshnikova, L. G., Sidorenkov, A. Yu., Silaev, A. A., Silaev, Jr., A. A., Skurikhin, A. V., Slunecka, M., Sokolov, A. V., Suvorkin, Y., Tabolenko, V. A., Tanaev, A., Tarashansky, B. A., Ternovoy, M., Tkachev, L. G., Tluczykont, M., Ushakov, N., Horns, D., and Yashin, I. I.

Published
2021
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48. Sources of UHECRs in view of the TUS and JEM-EUSO experiments

Author

Kalmykov, N. N., Khrenov, B. A., Kulikov, G. V., and Zotov, M. Yu.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

The origin of ultra-high-energy cosmic rays (UHECRs) is one of the most intriguing problems of modern cosmic ray physics. We briefly review the main astrophysical models of their origin and the forthcoming orbital experiments TUS and JEM-EUSO, and discuss how the new data can help one solve the long-standing puzzle., Comment: 4 pages; prepared for ECRS-2012 (http://ecrs2012.sinp.msu.ru/); v2: a reference added

Published
2012
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49. The Tunka-133 EAS Cherenkov light array: status of 2011

Author

Berezhnev, S. F., Besson, D., Korobchenko, A. V., Budnev, N. M., Chiavassa, A., Chvalaev, O. A., Gress, O. A., Dyachok, A. N., Epimakhov, S. N., Haungs, A., Karpov, N. I., Kalmykov, N. N., Konstantinov, E. N., Korosteleva, E. E., Kozhin, V. A., Kuzmichev, L. A., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Mirgazov, R. R., Panasyuk, M. I., Pankov, L. V., Popova, E. G., Prosin, V. V., Ptuskin, V. S., Semeney, Yu. A., Shaibonov Jr., B. A., Silaev, A. A., Silaev Jr., A. A., Skurikhin, A. V., Snyder, J., Spiering, C., Schreoder, F. G., Stockham, M., Sveshnikova, L. G., Wischnewski, R., Yashin, I. V., and Zagorodnikov, A. V.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

A new EAS Cherenkov light array, Tunka-133, with ~1 km^2 geometrical area has been installed at the Tunka Valley (50 km from Lake Baikal) in 2009. The array permits a detailed study of cosmic ray energy spectrum and mass composition in the energy range 10^16 - 10^18 eV with a uniform method. We describe the array construction, DAQ and methods of the array calibration.The method of energy reconstruction and absolute calibration of measurements are discussed. The analysis of spatial and time structure of EAS Cherenkov light allows to estimate the depth of the EAS maximum X_max. The results on the all particles energy spectrum and the mean depth of the EAS maximum X_max vs. primary energy derived from the data of two winter seasons (2009 -- 2011), are presented. Preliminary results of joint operation of the Cherenkov array with antennas for detection of EAS radio signals are shown. Plans for future upgrades -- deployment of remote clusters, radioantennas and a scintillator detector network and a prototype of the HiSCORE gamma-telescope -- are discussed., Comment: 8 pages, Proceedings of the RICAP 2011 Conference, submitted to NIM A

Published
2012
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50. Simulation of propagating EAS Cherenkov radiation over the ocean surface

Author

Shustova, O. P., Kalmykov, N. N., and Khrenov, B. A.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We present computing results of the Cherenkov light propagation in air and water from extensive air showers developing over the ocean. Limits on zenith angles of the showers, at which the registration of flashes of reflected Cherenkov photons by the satellite-based detector TUS is possible, are analyzed with consideration for waves on the ocean surface., Comment: 10 pages, 2 figures, 1 table. This preprint corrects errors which appeared in the English version of the article published in Mosc. Univ. Phys. Bull., 2011, Vol. 66, No. 5, p. 478. The original russian text was published in Vest. Mosk. Univ. Fiz., 2011, No. 5, p. 64

Published
2011
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