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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. 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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3. 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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4. 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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5. 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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6. 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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7. Particle identification in ground-based gamma-ray astronomy using convolutional neural networks

Author

Postnikov, E. B., Bychkov, I. V., Dubenskaya, J. Y., Fedorov, O. L., Kazarina, Y. A., Korosteleva, E. E., Kryukov, A. P., Mikhailov, A. A., Nguyen, M. D., Polyakov, S. P., Shigarov, A. O., Shipilov, D. A., and Zhurov, D. P.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Computer Science - Distributed, Parallel, and Cluster Computing, Physics - Data Analysis, Statistics and Probability, Statistics - Machine Learning
Abstract

Modern detectors of cosmic gamma-rays are a special type of imaging telescopes (air Cherenkov telescopes) supplied with cameras with a relatively large number of photomultiplier-based pixels. For example, the camera of the TAIGA-IACT telescope has 560 pixels of hexagonal structure. Images in such cameras can be analysed by deep learning techniques to extract numerous physical and geometrical parameters and/or for incoming particle identification. The most powerful deep learning technique for image analysis, the so-called convolutional neural network (CNN), was implemented in this study. Two open source libraries for machine learning, PyTorch and TensorFlow, were tested as possible software platforms for particle identification in imaging air Cherenkov telescopes. Monte Carlo simulation was performed to analyse images of gamma-rays and background particles (protons) as well as estimate identification accuracy. Further steps of implementation and improvement of this technique are discussed., Comment: 5 pages, 2 figures. Submitted to CEUR Workshop Proceedings, 8th International Conference "Distributed Computing and Grid-technologies in Science and Education" GRID 2018, 10 - 14 September 2018, Dubna, Russia

Published
2018

8. Gamma/Hadron Separation in Imaging Air Cherenkov Telescopes Using Deep Learning Libraries TensorFlow and PyTorch

Author

Postnikov, E. B., Kryukov, A. P., Polyakov, S. P., Shipilov, D. A., and Zhurov, D. P.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

In this work we compare two open source machine learning libraries, PyTorch and TensorFlow, as software platforms for rejecting hadron background events detected by imaging air Cherenkov telescopes (IACTs). Monte Carlo simulation for the TAIGA-IACT telescope is used to estimate background rejection quality. A wide variety of neural network algorithms provided by both libraries can easily be tested on various types of data, which is useful for various imaging air Cherenkov experiments. The work is a component of the Astroparticle.online project, which collaborates with the TAIGA and KASCADE experiments and welcomes any astroparticle experiment to join., Comment: 6 pages, 2 figures. Submitted to JPCS, 26th Extended European Cosmic Ray Symposium and 35th Russian Cosmic Ray Conference (E+CRS 2018 / RCRC 2018), Barnaul - Belokurikha, July 6 - 10, 2018

Published
2018
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9. Brownian yet non-Gaussian diffusion in heterogeneous media: from superstatistics to homogenization

Author

Postnikov, E. B., Chechkin, A., and Sokolov, I. M.

Subjects
Condensed Matter - Statistical Mechanics, Physics - Biological Physics
Abstract

We discuss the situations under which Brownian yet non-Gaussian (BnG) diffusion can be observed in the model of a particle's motion in a random landscape of diffusion coefficients slowly varying in space. Our conclusion is that such behavior is extremely unlikely in the situations when the particles, introduced into the system at random at $t=0$, are observed from the preparation of the system on. However, it indeed may arise in the case when the diffusion (as described in Ito interpretation) is observed under equilibrated conditions. This paradigmatic situation can be translated into the model of the diffusion coefficient fluctuating in time along a trajectory, i.e. into a kind of the "diffusing diffusivity" model., Comment: 12 pages; 10 figures

Published
2018

10. 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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11. Hybrid method for identifying mass groups of primary cosmic rays in the joint operation of IACTs and wide angle Cherenkov timing arrays

Author

Postnikov, E. B., Grinyuk, A. A., Kuzmichev, L. A., and Sveshnikova, L. G.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Physics - Data Analysis, Statistics and Probability
Abstract

This work is a methodical study of another option of the hybrid method originally aimed at gamma/hadron separation in the TAIGA experiment. In the present paper this technique was performed to distinguish between different mass groups of cosmic rays in the energy range 200 TeV - 500 TeV. The study was based on simulation data of TAIGA prototype and included analysis of geometrical form of images produced by different nuclei in the IACT simulation as well as shower core parameters reconstructed using timing array simulation. We show that the hybrid method can be sufficiently effective to precisely distinguish between mass groups of cosmic rays., Comment: 6 pages, 3 figures; proceedings of the 2nd International Conference on Particle Physics and Astrophysics (ICPPA-2016)

Published
2017
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12. Parametric Analysis of Cherenkov Light LDF from EAS for High Energy Gamma Rays and Nuclei: Ways of Practical Application

Author

Elshoukrofy, A. Sh. M., Postnikov, E. B., Korosteleva, E. E., Sveshnikova, L. G., and Motaweh, H. A.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Physics - Data Analysis, Statistics and Probability
Abstract

In this paper we propose a 'knee-like' approximation of the lateral distribution of the Cherenkov light from extensive air showers in the energy range 30-3000 TeV and study a possibility of its practical application in high energy ground-based gamma-ray astronomy experiments (in particular, in TAIGA-HiSCORE). The approximation has a very good accuracy for individual showers and can be easily simplified for practical application in the HiSCORE wide angle timing array in the condition of a limited number of triggered stations., Comment: 4 pages, 5 figures, proceedings of ISVHECRI 2016 (19th International Symposium on Very High Energy Cosmic Ray Interactions)

Published
2017
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13. Background rejection method for tens of TeV gamma-ray astronomy applicable to wide angle timing arrays

Author

Elshoukrofy, A. Sh. M., Postnikov, E. B., and Sveshnikova, L. G.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Physics - Data Analysis, Statistics and Probability
Abstract

A 'knee-like' approximation of Cherenkov light Lateral Distribution Functions, which we developed earlier, now is used for the actual tasks of background rejection methods for high energy (tens and hundreds of TeV) gamma-ray astronomy. In this work we implement this technique to the HiSCORE wide angle timing array consisting of Cherenkov light detectors with spacing of 100 m covering 0.2 km$^2$ presently and up to 5 km$^2$ in future. However, it can be applied to other similar arrays. We also show that the application of a multivariable approach (where 3 parameters of the knee-like approximation are used) allows us to reach a high level of background rejection, but it strongly depends on the number of hit detectors., Comment: 5 pages, 3 figures; proceedings of the 2nd International Conference on Particle Physics and Astrophysics (ICPPA-2016)

Published
2017
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14. Primary gamma ray selection in a hybrid timing/imaging Cherenkov array

Author

Postnikov, E. B., Grinyuk, A. A., Kuzmichev, L. A., and Sveshnikova, L. G.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Physics - Data Analysis, Statistics and Probability
Abstract

This work is a methodical study on hybrid reconstruction techniques for hybrid imaging/timing Cherenkov observations. This type of hybrid array is to be realized at the gamma-observatory TAIGA intended for very high energy gamma-ray astronomy (>30 TeV). It aims at combining the cost-effective timing-array technique with imaging telescopes. Hybrid operation of both of these techniques can lead to a relatively cheap way of development of a large area array. The joint approach of gamma event selection was investigated on both types of simulated data: the image parameters from the telescopes, and the shower parameters reconstructed from the timing array. The optimal set of imaging parameters and shower parameters to be combined is revealed. The cosmic ray background suppression factor depending on distance and energy is calculated. The optimal selection technique leads to cosmic ray background suppression of about 2 orders of magnitude on distances up to 450 m for energies greater than 50 TeV., Comment: 4 pages, 5 figures; proceedings of the 19th International Symposium on Very High Energy Cosmic Ray Interactions (ISVHECRI 2016)

Published
2017
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15. Parametric analysis of Cherenkov light LDF from EAS in the range 30-3000 TeV for primary gamma rays and nuclei

Author

Elshoukrofy, A. Sh. M., Postnikov, E. B., Korosteleva, E. E., Sveshnikova, L. G., and Motaweh, H. A.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Physics - Data Analysis, Statistics and Probability
Abstract

A simple 'knee-like' approximation of the Lateral Distribution Function (LDF) of Cherenkov light emitted by EAS (extensive air showers) in the atmosphere is proposed for solving various tasks of data analysis in HiSCORE and other wide angle ground-based experiments designed to detect gamma rays and cosmic rays with the energy above tens of TeV. Simulation-based parametric analysis of individual LDF curves revealed that on the radial distance 20-500 m the 5-parameter 'knee-like' approximation fits individual LDFs as well as the mean LDF with a very good accuracy. In this paper we demonstrate the efficiency and flexibility of the 'knee-like' LDF approximation for various primary particles and shower parameters and the advantages of its application to suppressing proton background and selecting primary gamma rays., Comment: 7 pages, 1 table, 2 figures; Bulletin of the Russian Academy of Sciences: Physics, 81, 4 (2017), in press

Published
2017
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16. 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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17. 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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18. 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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19. Isobaric heat capacity, isothermal compressibility and fluctuational properties of 1-bromoalkanes

Author

Korotkovskii, V. I., Ryshkova, O. S., Neruchev, Yu. A., Goncharov, A. L., and Postnikov, E. B.

Subjects
Physics - Chemical Physics, Condensed Matter - Statistical Mechanics
Abstract

We present results of the experimental measurements of the isobaric heat capacity for 1-bromohexane, 1-bromoheptane, 1-bromooctane, 1-bromononane, 1-bromodecane, 1-bromoundecane, 1-bromododecane and 1-bromo-tetradecane at normal pressure and the speed of sound and the density for 1-bromotetradecane within the temperature range 298.15--423.15~K. These data on the isobaric heat capacity and the literature-based reference data for the density and the speed of sound were used to calculate the isothermal compressibility and the inverse reduced fluctuations. Based on the comparison of the results for pure n-alkanes and $\alpha,\omega$-dibromoalkanes, we discuss the influence of bromine atom on the volume fluctuations., Comment: 13 pages, 5 table, 4 figures

Published
2016
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20. On the speed of sound and heat capacity of liquid neon in the subcritical region

Author

Goncharov, A. L., Melent'ev, V. V., and Postnikov, E. B.

Subjects
Physics - Classical Physics, Condensed Matter - Statistical Mechanics
Abstract

The data (the speed of sound, the isobaric and isochoric heat capacities as well as the heat capacity ratio) for liquid neon presented in NIST Chemistry WebBook are analyzed. It has been shown, basing on the representation of the inverse reduced volume fluctuations, that they consist of sufficient discrepancies in the subcritical region. The correction of data in this region of the coexistence curve is evaluated using the fluctuation approach and the theory of thermodynamic similarity., Comment: 5 pages, 3 figures

Published
2016
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21. Non-spectral modes and how to find them in the Ornstein-Uhlenbeck process with white {\mu}-stable noise

Author

Thiel, F., Sokolov, I. M., and Postnikov, E. B.

Subjects
Physics - Data Analysis, Statistics and Probability, Condensed Matter - Statistical Mechanics
Abstract

We consider the Ornstein-Uhlenbeck process with a broad initial probability distribution (Levy distribution), which exhibits so-called non-spectral modes. The relaxation of such modes differs from those determined from the parameters of the corresponding Fokker-Planck equation. The first non-spectral mode is shown to govern the relaxation process and allows for estimation of the initial distribution's Levy index. A method based on continuous wavelet transformation is proposed to extract both (spectral and non-spectral) relaxation rates from a stochastic data sample., Comment: 7 pages, 3 figures, 1 table

Published
2016
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23. Remote Access M\'ossbauer Spectrometry

Author

Silaev, A. A., Godovikov, S. K., Postnikov, E. B., and Radchenko, V. V.

Subjects
Physics - Physics Education, Physics - Instrumentation and Detectors
Abstract

The authors' design for a M\"ossbauer spectroscopy unit accessed via the Internet is presented. The spectrometer's configuration, operational peculiarities, key specifications, and remote access procedures are described. More detailed educational, scientific, and technical information can be found at the project's official website http://efmsb.sinp.msu.ru., Comment: 5 pages, 6 figures

Published
2015
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24. Analytical properties of a three-compartmental dynamical demographic model

Author

Postnikov, E. B.

Subjects
Quantitative Biology - Populations and Evolution, Mathematics - Classical Analysis and ODEs, Mathematics - Dynamical Systems, Nonlinear Sciences - Chaotic Dynamics
Abstract

The three-compartmental demographic model by Korotaeyv-Malkov-Khaltourina, connecting population size, economic surplus, and educational level, is considered from the point of view of dynamical systems theory. It is shown that there exist two integrals of motion, which enable the system to be reduced to one non-linear ordinary differential equation. The study of its structure provides analytical criteria for the dominance ranges of the dynamics of Malthus and Kremer. Additionally, the particular ranges of parameters enable the derived general ordinary differential equations to be reduced to the models of Gompertz and Thoularis-Wallace., Comment: 4 pages

Published
2015
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25. 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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26. 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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27. Tait equation revisited from the entropic and fluctuational points of view

Author

Postnikov, E. B., Goncharov, A. L., and Melent'ev, V. V.

Subjects
Condensed Matter - Statistical Mechanics, Physics - Classical Physics
Abstract

We consider the possibilities for prediction of liquids' density under pressure basing on the inverse reduced fluctuations parameter, which is directly connected with the isothermal compressibility. This quantity can be determined basing on the thermodynamical properties of saturated liquid and it consists of only two constant parameters within a relatively wide region close to the melting points. It is confirmed by the comparison with the experimental data on n-alkanes that the derived expression is a quite reasonable estimator without a necessity to fit data along some parts of isotherms for different temperatures. At the same time the obtained formula: i) can be reduced to the form of the Tait equation and ii) the resulting Tait's parameters in this representation have a clear physical meaning as functions of the excess entropy, which determines the mentioned reduced fluctuations., Comment: 9 pages, 1 figure

Published
2014
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28. Limits of structure stability of simple liquids revealed by study of relative fluctuations

Author

Goncharov, A. L., Melent'ev, V. V., and Postnikov, E. B.

Subjects
Condensed Matter - Statistical Mechanics
Abstract

We analyse the inverse reduced fluctuations (inverse ratio of relative volume fluctuation to its value in the hypothetical case where the substance acts an ideal gas for the same temperature-volume parameters) for simple liquids from experimental acoustic and thermophysical data along a coexistence line for both liquid and vapour phases. It has been determined that this quantity has a universal exponential character within the region close to the melting point. This behaviour satisfies the predictions of the mean-field (grand canonical ensemble) lattice fluid model and relates to the constant average structure of a fluid, i.e. redistribution of the free volume complementary to a number of vapour particles. The interconnection between experiment-based fluctuational parameters and self-diffusion characteristics is discussed. These results may suggest experimental methods for determination of self-diffusion and structural properties of real substances., Comment: 5 pages, 4 figures

Published
2014
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30. Monte Carlo Simulation of the TAIGA Experiment

Author

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

Published
2019
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31. 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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32. Non-spectral relaxation in one dimensional Ornstein-Uhlenbeck processes

Author

Toenjes, R., Sokolov, I. M., and Postnikov, E. B.

Subjects
Condensed Matter - Soft Condensed Matter, Condensed Matter - Disordered Systems and Neural Networks, Mathematics - Statistics Theory
Abstract

The relaxation of a dissipative system to its equilibrium state often shows a multiexponential pattern with relaxation rates, which are typically considered to be independent of the initial condition. The rates follow from the spectrum of a Hermitian operator obtained by a similarity transformation of the initial Fokker-Planck operator. However, some initial conditions are mapped by this similarity transformation to functions which grow at infinity. These cannot be expanded in terms of the eigenfunctions of an Hermitian operator, and show different relaxation patterns. Considering the exactly solvable examples of Gaussian and generalized L\'evy Ornstein-Uhlenbeck processes (OUPs) we show that the relaxation rates belong to the Hermitian spectrum only if the initial condition belongs to the domain of attraction of the stable distribution defining the noise. While for an ordinary OUP initial conditions leading to non-spectral relaxation can be considered exotic, for generalized OUPs driven by L\'evy noise these are the rule., Comment: 4 pages, 1 figure

Published
2012
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33. Possible structure in the cosmic ray electron spectrum measured by the ATIC-2 and ATIC-4 experiments

Author

Panov, A. D., Zatsepin, V. I., Sokolskaya, N. V., Adams, Jr., J. H., Ahn, H. S., Bashindzhagyan, G. L., Chang, J., Christl, M., Guzik, T. G., Isbert, J., Kim, K. C., Kouznetsov, E. N., Panasyuk, M. I., Postnikov, E. B., Seo, E. S., Watts, J., Wefel, J. P., and Wu, J.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

A strong excess in a form of a wide peak in the energy range of 300-800 GeV was discovered in the first measurements of the electron spectrum in the energy range from 20 GeV to 3 TeV by the balloon-borne experiment ATIC (J. Chang et al. Nature, 2008). The experimental data processing and analysis of the electron spectrum with different criteria for selection of electrons, completely independent of the results reported in (J. Chang et al. Nature, 2008) is employed in the present paper. The new independent analysis generally confirms the results of (J. Chang et al. Nature, 2008), but shows that the spectrum in the region of the excess is represented by a number of narrow peaks. The measured spectrum is compared to the spectrum of (J. Chang et al. Nature, 2008) and to the spectrum of the Fermi/LAT experiment., Comment: LaTeX2e, 10 pages, 4 figures, a paper for ECRS 2010 (Turku, Finland); http://www.astrophys-space-sci-trans.net/7/119/2011/

Published
2011
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34. Analysis of patterns formed by two-component diffusion limited aggregation

Author

Postnikov, E. B., Ryabov, A. B., and Loskutov, A.

Subjects
Condensed Matter - Other Condensed Matter, Mathematical Physics
Abstract

We consider diffusion limited aggregation of particles of two different kinds. It is assumed that a particle of one kind may adhere only to another particle of the same kind. The particles aggregate on a linear substrate which consists of periodically or randomly placed particles of different kinds. We analyze the influence of initial patterns on the structure of growing clusters. It is shown that at small distances from the substrate, the cluster structures repeat initial patterns. However, starting from a critical distance the initial periodicity is abruptly lost, and the particle distribution tends to a random one. An approach describing the evolution of the number of branches is proposed. Our calculations show that the initial patter can be detected only at the distance which is not larger than approximately one and a half of the characteristic pattern size., Comment: Accepted for publication in Physical Review E

Published
2010
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35. Analysis of Saturn main rings by continuous wavelet transform with the complex Morlet wavelet

Author

Postnikov, E. B. and Loskutov, A.

Subjects
Astrophysics
Abstract

A new method based on continuous wavelet transform with the complex Morlet wavelet to analyze Saturn main rings is presented. It allows to investigate in detail the resonance zones and reveal the coexistence of waves with stable periods and the wave trains with a variable instant period. This method is based on the replacing the integration of the fast--oscillation function by the solution of the partial differential equations. It is shown that such an approach is an effective tool for the study the radial structure of Saturn's A, B, and C rings. All the analyzed images were obtained from the Cassini spacecraft during 2004--2005 years., Comment: 23 pages, 10 figures

Published
2006

36. Wavelet transform and diffusion equations: applications to the processing of the 'Cassini' spacecraft observations

Author

Postnikov, E. B. and Loskutov, A.

Subjects
Astrophysics, Mathematical Physics
Abstract

We show that continuous transform with the complex Morlet wavelet is easily performed if we replace the integration of the fast-oscillation function by the solution of the diffusion differential equations. The most important advantage of this approach is that the initial data can be represented by non-uniform sample of an arbitrary node number. We apply the proposed method to the processing of the image of the Saturn A-ring obtained from the Cassini spacecraft. Also we have got via the wavelet transform using PDE, the local correlation coefficient of the signal and the harmonic function.

Published
2005

37. Application of the Wavelet Transform with a Piecewise Linear Basis to the Evaluation of the Hankel Transform

Author

Zykov, P. S. and Postnikov, E. B.

Subjects
Mathematics - Numerical Analysis, Mathematical Physics, 44A15, 65R10
Abstract

A method for computing the Hankel transform is proposed whereby the letter is reduced to a sum by representing the integrand as a smooth function times a Bessel function. The smooth function is replaced by its wavelet decomposition with a basis such that its scalar product with the Bessel function is calculated analytically. The result is represented as a series, with the coefficients strongly depending on the local behavior of the function being transformed. The application of the method is demonstrated by an example illustrated with plots.

Published
2004

38. Energy Spectrum of Primary Cosmic Rays, According to TUNKA-133 and TAIGA-HiSCORE EAS Cherenkov Light Data

Author

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

Published
2019
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39. TAIGA: A Complex of Hybrid Systems of Cooperating Detectors for Gamma Astronomy and Cosmic Ray Physics in the Tunka Valley

Author

Budnev, N. M., Astapov, I. I., Bezyazeekov, P. A., Borodin, A. N., Wischnewski, R., Garmash, A. Yu., Gafarov, A. R., Gorbunov, N. V., Grebenyuk, V. M., Gress, O. A., Gress, T. I., Grinyuk, A. A., Grishin, O. G., Dyachok, A. N., Zhurov, D. P., Zagorodnikov, A. V., Zurbanov, V. L., Ivanova, A. L., Kazarina, Yu. A., Kalmykov, N. N., Karpov, N. I., Kindin, V. V., Kirilenko, P. S., Kiryuhin, S. N., Kozhin, V. A., Kokoulin, R. P., Kompaniets, K. G., Korosteleva, E. E., Kravchenko, E. A., Kuzmichev, L. A., Kunnas, M., Chiavassa, A., Lagutin, A. A., Lenok, V. V., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Mirgazov, R. R., Mirzoyan, R., Monkhoev, R. D., Nakhtigal, R., Osipova, E. A., Panasyuk, M. I., Pankov, L. V., Pakhorukov, A. L., Petrukhin, A. 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., Sagan, Y. I., Samoliga, V. S., Sveshnikova, L. G., Sidorenkov, A. Yu., Silaev, A. A., Silaev, A. A., Skurikhin, A. V., Slunecka, M., Sokolov, A. V., Sulakov, V. P., Tabolenko, V. A., Tanaev, A. B., Tarashansky, B. A., Tkachev, L. G., Tkachenko, A. V., Tluczykont, M., Fedorov, O. L., Horns, D., Spiering, C., and Yashin, I. I.

Published
2019
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40. First Season of Operation of the TAIGA Hybrid Cherenkov Array

Author

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

Published
2019
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41. About Calculation of the Hankel Transform Using Preliminary Wavelet Transform

Author

Postnikov, E. B.

Subjects
Mathematics - Numerical Analysis, 44A15, 65R10
Abstract

The purpose of this paper is to present an algorithm for evaluating Hankel transform of the null and the first kind. The result is the exact analytical representation as the series of the Bessel and Struve functions multiplied by the wavelet coefficients of the input function. Numerical evaluation of the test function with known analytical Hankel transform illustrates the proposed algorithm., Comment: 5 pages, 2 figures. Some misprints are corrected

Published
2002

42. Application of New Approximations of the Lateral Distribution of EAS Cherenkov Light in the Atmosphere

Author

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

Published
2018
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44. The TAIGA Experiment: From Cosmic Ray Physics to Gamma Astronomy in the Tunka Valley

Author

Budnev, N. M., Astapov, I. I., Bezyazeekov, P. A., Boreyko, A. V., Borodin, A. N., Garmash, A. Yu., Gafarov, A. R., Gorbunov, N. V., Grebenyuk, V. M., Gress, O. A., Gress, T. I., Grinyuk, A. A., Grishin, O. G., Dyachok, A. N., Zhurov, D. P., Zagorodnikov, A. V., Zurbanov, V. L., Ivanova, A. L., Kazarina, Yu. A., Kalmykov, N. N., Kindin, V. V., Kirilenko, P. S., Kiryuhin, S. N., Kozhin, V. A., Kokoulin, R. P., Kompaniets, K. G., Korosteleva, E. E., Kostunin, D. G., Kravchenko, E. I., Kuzmichev, L. A., Lemeshev, Yu. E., Lenok, V. V., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Mirgazov, R. R., Mirzoyan, R., Monkhoev, R. D., Osipova, E. A., Panasyuk, M. I., Pankov, L. V., Pakhorukov, A. L., Petrukhin, A. A., Poleschuk, V. A., Popova, E. G., Postnikov, E. B., Prosin, V. V., Ptuskin, V. S., Pushnin, A. A., Rubtsov, G. I., Ryabov, E. V., Sabirov, B. M., Sagan, Ya., Samoliga, V. S., Sveshnikova, L. G., Semeney, Yu. A., Sidorenkov, A. Yu., Silaev, A. A., Silaev, A. A., Skurikhin, A. O., Slunecka, M., Sokolov, A. V., Tabolenko, V. A., Tarashansky, B. A., Tkachev, L. G., Tkachenko, A. V., Fedorov, O. L., and Yashin, I. I.

Published
2018
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45. TAIGA Gamma Observatory: Status and Prospects

Author

Kuzmichev, L. A., Astapov, I. I., Bezyazeekov, P. A., Boreyko, V., Borodin, A. N., Budnev, N. M., Wischnewski, R., Garmash, A. Y., Gafarov, A. R., Gorbunov, N. V., Grebenyuk, V. M., Gress, O. A., Gress, T. I., Grinyuk, A. A., Grishin, O. G., Dyachok, A. N., Zagorodnikov, A. V., Zurbanov, V. L., Ivanova, A. L., Kazarina, Y. A., Kalmykov, N. N., Karpov, N. I., Kindin, V. V., Kirilenko, P. S., Kiryuhin, S. N., Kozhin, V. A., Kokoulin, R. P., Kompaniets, K. G., Korosteleva, E. E., Kravchenko, E. A., Kunnas, M., Chiavassa, A., Lagutin, A. A., Lenok, V. V., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Mirgazov, R. R., Mirzoyan, R., Monkhoev, R. D., Nachtigall, R., Osipova, E. 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., Sagan, Ya. I., Samoliga, V. S., Sveshnikova, L. G., Semeney, Yu. A., Sidorenkov, A. Y., Silaev, A. A., Silaev, Jr., A. A., Skurikhin, A. V., Slunecka, M., Sokolov, A. V., Sulakov, V. P., Tabolenko, V. A., Tarashansky, B. A., Tkachev, L. G., Tkachenko, A. V., Tluczykont, M., Fedorov, O. L., Horns, A. D., Spiering, C., Elshoukrofy, A. Sh. M., and Yashin, I. I.

Published
2018
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46. The TAIGA experiment

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, 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., 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., Satyshev, I., Semeney, Yu. A., Silaev, A. A., Sidorenkov, A. Yu., Skurikhin, A. V., 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., Zhurov, D. P., and TAIGA Collaboration

Subjects
showers, atmosphere, hybrid, air, Crab Nebula [Observations], resolution, Observations: Crab Nebula, beam, width, energy, low, wide-angle, Cherenkov counter, energy, high, gamma ray, cosmic radiation, experiments [Gamma-rays], charged particle, detector, radiation, Cherenkov, TeV, spectral, surface, muon, detector, Gamma-rays: experiments, detector, imaging
Abstract

The Sixteenth Marcel Grossmann Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics, and Relativistic Field Theories (In 4 Volumes) 16th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, MG16, Online, Italy, 5 Jul 2021 - 9 Jul 2021; World Scientific Publishing 3324-3342 (2023). doi:10.1142/9789811269776_0274, The Tunka Advanced Instrument for Gamma-ray and cosmic ray Astrophysics (TAIGA) is a hybrid experiment for the measurement of Extensive Air Showers (EAS) with good spectral resolution in the TeV to PeV energy range. In this domain, the long-sought Pevatrons can be detected. Currently the hybrid TAIGA detector combines two wide angle shower front Cherenkov light sampling timing arrays (HiSCORE and Tunka-133), two 4m class, 10° aperture Imaging Air Cherenkov Telescopes (IACTs) and 240 m2 surface and underground charged particle detector stations. Our goal is to introduce a new hybrid reconstruction technique, combining the good angular and shower core resolution of HiSCORE with the gamma-hadron separation power of imaging telescopes. This approach allows to maximize the effective area and simultaneously to reach a good gamma-hadron separation at low energies (few TeV). At higher energies, muon detectors are planned to enhance gamma-hadron separation. During the commissioning phase of the first and second IACT, several sources were observed. First detections of known sources with the first telescope show the functionality of the TAIGA IACTs. Here, the status of the TAIGA experiment will be presented, along with first results from the current configuration., Published by World Scientific Publishing

Published
2023
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47. The TAIGA-HiSCORE array prototype: Status and first results

Author

Astapov, I. I., Barbashina, N. S., Bogdanov, A. G., Boreyko, V., Budnev, N. M., Wischnewski, R., Gafarov, A. R., Grebenyuk, V., Gress, O. A., Gress, T. I., Grinyuk, A. A., Grishin, O. G., Gorbunov, N., Dyachok, A. N., Epimakhov, S. N., Zagorodnikov, A. V., Zurbanov, V. L., Ivanova, A. L., Kazarina, Y. A., Kalmykov, N. N., Karpov, N. I., Kindin, V. V., Kiryuhin, S. N., Kokoulin, R. P., Kompaniets, K. G., Korosteleva, E. E., Kozhin, V. A., Kravchenko, E., Kunnas, M., Kuzmichev, L. A., Chiavassa, A., Lenok, V. V., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Mirgazov, R. R., Mirzoyan, R., Monkhoev, R. D., Nachtigall, R., Pakhorukov, A. L., Osipova, E. A., Panasyuk, M. I., Pankov, L. V., Petrukhin, A. A., Popescu, M., Porelli, A., Pushnin, A. A., Poleschuk, V. A., Popova, E. G., Postnikov, E. B., Prosin, V. V., Ptuskin, V. S., Rubtsov, G. I., Samoliga, V. S., Semeney, Y. A., Silaev, A. A., Silaev, Jr., A. A., Skurikhin, A. V., Sveshnikova, L. G., Sokolov, A., Tabolenko, V. A., Tarashchansky, B. A., Tkachev, L. G., Tkachenko, A. V., Tluczykont, M., Fedorov, O. L., Horns, D., Spiering, C., Yurin, K., and Yashin, I. I.

Published
2017
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48. The Tunka-Grande experiment: Status and prospects

Author

Monkhoev, R. D., Budnev, N. M., Voronin, D. M., Gafarov, A. R., Gress, O. A., Gress, T. I., Grishin, O. G., Dyachok, A. N., Epimakhov, S. N., Zhurov, D. P., Zagorodnikov, A. V., Zurbanov, V. L., Ivanova, A. L., Kalmykov, N. N., Kazarina, Yu. A., Kiryuhin, S. N., Korosteleva, E. E., Kozhin, V. A., Kuzmichev, L. A., Lenok, V. V., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Mirgazov, R. R., Mirzoyan, R., Osipova, E. A., Pakhorukov, A. L., Panasyuk, M. I., Pankov, L. V., Poleschuk, V. A., Popova, E. G., Postnikov, E. B., Prosin, V. V., Ptuskin, V. S., Pushnin, A. A., Samoliga, V. S., Semeney, Y. A., Sveshnikova, L. G., Silaev, A. A., Silaev, Jr., A. A., Skurikhin, A. V., Sulakov, V. P., Tabolenko, V. A., Fedorov, O. L., Fomin, Yu. A., Chiavassa, A., and Spiering, C.

Published
2017
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