2019, Kokoulin, R. P., Barbashina, N. S., Bogdanov, A. G., Kindin, V. V., Kompaniets, K. G., Petrukhin, A. A., Khomyakov, V. A., Khokhlov, S. S., Shutenko, V. V., Yashin, I. I., Кокоулин, Ростислав Павлович, Барбашина, Наталья Сергеевна, Богданов, Алексей Георгиевич, Киндин, Виктор Владимирович, Компаниец, Константин Георгиевич, Петрухин, Анатолий Афанасьевич, Хохлов, Семен Сергеевич, Шутенко, Виктор Викторович, Яшин, Игорь Иванович

© 2019, Allerton Press, Inc.Abstract: Results are presented from analyzing experimental data on 0.1–10 TeV cascade showers generated by muons in the NEVOD Cherenkov water detector. The procedure for selecting and reconstructing the parameters of events with cascades in the detector volume is discussed. Results are presented from measurements of the zenith angle distribution of cascades for different energies. The measured distributions are compared to results from calculations.

2019, Yashin, I. I., Astapov, I. I., Barbashina, N. S., Dmitrieva, A. N., Kompaniets, K. G., Petrukhin, A. A., Shutenko, V. V., Яшин, Игорь Иванович, Астапов, Иван Иванович, Барбашина, Наталья Сергеевна, Дмитриева, Анна Николаевна, Компаниец, Константин Георгиевич, Петрухин, Анатолий Афанасьевич, Шутенко, Виктор Викторович

© 2019, Allerton Press, Inc.Abstract: Continuous monitoring of the muon flux over wide ranges of zenith and azimuth angles with the URAGAN detector (Moscow, 55.7° N, 37.7° E, 173 m AMSL) allows detection of variations in its intensity and angular distribution. A way of locating domains of anisotropy in the muon angular distribution is described, and they are mapped in matrix form in the GSE coordinate system. The maximum depth (height) of deformation, the zenith and azimuth angles of the center in the local system, and its GSE longitude and latitude are determined for each observed domain. The GSE longitudes of the detected domains of anisotropy are available on the Internet as functions of time and can be used to monitor the heliosphere’s activity.

2019, Kovylyaeva, A. A., Astapov, I. I., Barbashina, N. S., Borog, V. V., Dmitrieva, A. N., Kompaniets, K. G., Mishutina, Y. N., Petrukhin, A. A., Shutenko, V. V., Yakovleva, E. I., Yashin, I. I., Астапов, Иван Иванович, Барбашина, Наталья Сергеевна, Борог, Владимир Викторович, Дмитриева, Анна Николаевна, Компаниец, Константин Георгиевич, Мишутина, Юлия Николаевна, Петрухин, Анатолий Афанасьевич, Шутенко, Виктор Викторович, Яшин, Игорь Иванович

© 2019, Pleiades Publishing, Ltd.Results of the study of variations of cosmic ray muon flux at the Earth surface during Forbush decreases registered in 2007–2018 by means of the muon hodoscope URAGAN are presented. The dynamics of the amplitude spectral index at different stages (the decrease, the minimum, and the recovery), which correspond to different phases of the influence of heliospheric disturbances on the flux of cosmic rays for the period 2012 to 2018, is considered. To investigate possible regularities in the behavior of the projection of the relative local anisotropy vector of the muon flux to the South and to the East (rS and rE) during 2007–2018, the distributions of these parameters for four phases (immediately before FD, decrease phase, minimum phase, recovery phase) were calculated.

2019, Postnikov, E. B., Bezyazeekov, P. A., Boreyko, V. F., Borodin, A. N., Astapov, I. I., Kindin, V. V., Kokoulin, R. P., Kompaniets, K. G., Petrukhin, A. A., Postnikov, E. B., Yashin, I. I., Астапов, Иван Иванович, Киндин, Виктор Владимирович, Кокоулин, Ростислав Павлович, Компаниец, Константин Георгиевич, Петрухин, Анатолий Афанасьевич, Яшин, Игорь Иванович

© 2019, Allerton Press, Inc.Abstract—: The TAIGA (Tunka Advanced Instrument for cosmic ray physics and Gamma-ray Astronomy) experiment aims at observing gamma-rays in the energy range from 1 TeV to several 100 TeV. The operation of the observatory is based on a new hybrid approach that combines imaging air Cherenkov telescopes (IACTs) and wide-angle Cherenkov detectors (TAIGA-HiSCORE) for measuring times of extensive air shower (EAS) light front arrival. Monte Carlo simulations are compared to real data to determine the performance of the detector setup. Dedicated software and algorithms are described, model parameters are given, and an overview of the current status of model-based performance studies is presented.

2019, Mannocchi, G., Trinchero, G., Amelchakov, M. B., Barbashina, N. S., Bogdanov, A. G., Gromushkin, D. M., Zadeba, E. A., Kindin, V. V., Kokoulin, R. P., Kompaniets, K. G., Chiavassa, A., Likiy, O. I., Petrukhin, A. A., Stenkin, Y. V., Khokhlov, S. S., Shulzhenko, I. A., Shutenko, V. V., Yurin, K. O., Yashin, I. I., Амельчаков, Михаил Борисович, Барбашина, Наталья Сергеевна, Богданов, Алексей Георгиевич, Громушкин, Дмитрий Михайлович, Задеба, Егор Александрович, Киндин, Виктор Владимирович, Кокоулин, Ростислав Павлович, Компаниец, Константин Георгиевич, Петрухин, Анатолий Афанасьевич, Стенькин, Юрий Васильевич, Хохлов, Семен Сергеевич, Шульженко, Иван Андреевич, Шутенко, Виктор Викторович, Яшин, Игорь Иванович

© 2019, Allerton Press, Inc.Abstract: The NEVOD experimental complex was created at MEPhI. It includes several facilities for studying the electron–photon, muon, and hadron components of the EAS in the energy range of 1 PeV to 1 EeV. This work presents the first results for two months of the joint operation of five facilities (NEVOD-EAS, CWD, CTS, PRISMA-32, and DECOR). The problems of synchronizing the facilities and selecting joint events are considered. The experimental data of these facilities are analyzed for different components of the EAS in overlapping energy ranges.

2019, Kovylyaeva, A. A., Astapov, I. I., Barbashina, N. S., Borog, V. V., Dmitrieva, A. N., Kompaniets, K. G., Mishutina, Y. N., Petrukhin, A. A., Shutenko, V. V., Yakovleva, E. I., Yashin, I. I., Астапов, Иван Иванович, Барбашина, Наталья Сергеевна, Борог, Владимир Викторович, Дмитриева, Анна Николаевна, Компаниец, Константин Георгиевич, Мишутина, Юлия Николаевна, Петрухин, Анатолий Афанасьевич, Шутенко, Виктор Викторович, Яшин, Игорь Иванович

© 2019, Allerton Press, Inc.Abstract: Results are presented from an analysis of changes in the muon flux of cosmic rays during Forbush effects, recorded by the URAGAN muon hodoscope in the period 2012–2017 and the scintillation muon hodoscope in 2016–2017. Characteristics of the Forbush effects for this period are analyzed. The obtained characteristics of muon flux variations are compared to different parameters of the near heliosphere during the Forbush effects for the 11-year cycle of solar activity.

2019, Prosin, V. V., Bezyazeekov, P. A., Boreyko, V., Borodin, A. N., Astapov, I. I., Kindin, V. V., Kokoulin, R. P., Kompaniets, K. G., Petrukhin, A. A., Yashin, I. I., Астапов, Иван Иванович, Киндин, Виктор Владимирович, Кокоулин, Ростислав Павлович, Компаниец, Константин Георгиевич, Петрухин, Анатолий Афанасьевич, Яшин, Игорь Иванович

© 2019, Allerton Press, Inc.Abstract: The Tunka-133 Cherenkov complex for recording extensive air showers (EAS) collected data over seven winters from 2009 to 2017. The differential energy spectra of all particles was acquired in the 6 × 1015–3 × 1018 eV range of energies over 2175 h. The TAIGA-HiSCORE complex is continually being expanded and upgraded. Data acquired by 30 first-line stations over 35 days during the period 2017–2018 is analyzed in this work. As at the Tunka-133 setup, the primary particle energies above 1015 eV are measured using the density of the Cherenkov light flux at a distance of 200 m from a shower’s axis. Data on lower energies are collected by determining the energy of the light flux near a shower’s axis. This results in a spectrum of 2 × 1014–1017 eV. The combined spectrum for the two systems covers a range of 2 × 1014–2 × 1018 eV.

2019, Mannocchi, G., Saavedra, O., Trinchero, G., Yurina, E. A., Barbashina, N. S., Bogdanov, A. G., Kindin, V. V., Kokoulin, R. P., Kompaniets, K. G., Petrukhin, A. A., Khomyakov, V. A., Khokhlov, S. S., Shutenko, V. V., Yashin, I. I., Юрина, Екатерина Александровна, Барбашина, Наталья Сергеевна, Богданов, Алексей Георгиевич, Киндин, Виктор Владимирович, Кокоулин, Ростислав Павлович, Компаниец, Константин Георгиевич, Петрухин, Анатолий Афанасьевич, Хохлов, Семен Сергеевич, Шутенко, Виктор Викторович, Яшин, Игорь Иванович

© 2019, Allerton Press, Inc.Abstract: Energy characteristics of the muon component of extensive air showers (EASes) are investigated at the NEVOD experimental complex in order to solve the problem of a detected excess of muons in EASes at ultrahigh energies, relative to simulation results. The dependences of the energy deposit of muon bundles on the zenith angle and the local muon density are obtained for primary energies of 10–1000 PeV. The results from comparing the data to simulations performed with the CORSIKA program are presented.

2019, Mannocchi, G., Trinchero, G., Yurina, E. A., Barbashina, N. S., Bogdanov, A. G., Khokhlov, S. S., Kindin, V. V., Kokoulin, R. P., Kompaniets, K. G., Petrukhin, A. A., Shutenko, V. V., Yashin, I. I., Юрина, Екатерина Александровна, Барбашина, Наталья Сергеевна, Богданов, Алексей Георгиевич, Хохлов, Семен Сергеевич, Киндин, Виктор Владимирович, Кокоулин, Ростислав Павлович, Компаниец, Константин Георгиевич, Петрухин, Анатолий Афанасьевич, Шутенко, Виктор Викторович, Яшин, Игорь Иванович

© 2019, Pleiades Publishing, Ltd.Investigations of the energy loss of muon bundles are being conducted at the Experimental complex NEVOD. Such investigations are directed to detailed study of “muon puzzle” (the excess of multi-muon events observed in several cosmic ray experiments at ultra-high energies). Results of measurements of the muon bundle energy deposit during a long period of observations in primary cosmic ray energy range 10–1000 PeV have been obtained and have been compared with simulations performed on the basis of the CORSIKA code.

2019, Bezyazeekov, P., Borodin, A., Brueckner, M., Budnev, N., Astapov, I., Kindin, V., Kokoulin, R., Kompaniets, K., Petrukhin, A., Yashin, I., Астапов, Иван Иванович, Киндин, Виктор Владимирович, Кокоулин, Ростислав Павлович, Компаниец, Константин Георгиевич, Петрухин, Анатолий Афанасьевич, Яшин, Игорь Иванович

© 2018 It is planned that new TAIGA-Muon detectors will complement the existing Tunka-GRANDE facility of scintillation detectors of the TAIGA gamma-observatory in the Tunka valley, Russia. The new design of scintillation detector with wavelength shifting bars and PMTs is developed. The first prototype of the counter was installed and tested using infrastructure of the Tunka-GRANDE installation in 2017. The mass production of counters has begun in 2018 at the Novosibirsk State University.