Measuring the energy spectrum of very high-energy muons (VHE-muons) solves many problems of cosmic rays physics and nucleus-nucleus interactions. The most promising facilities for solving this problem are gigaton neutrino telescopes (IceCube, Baikal-GVD and KM3NeT). However, VHE-muons (E > 30-100 TeV) come into the detector accompanied by muon bundles of various multiplicities. In this case,...
In recent decades, Cherenkov water (ice) telescopes such as IceCube, Baikal-GVD and KM3Net are being actively developed for research in the field of neutrino physics and astrophysics. Optical modules are the main detecting elements of such neutrino telescopes.
Calibration of optical modules of different neutrino telescopes under the same conditions is one of the important experimental...
The Experimental Complex NEVOD includes a number of large-scale facilities for detection of high energy cosmic rays, including the ProtoTREK and the NEVOD-EAS detectors. The coordinate detector ProtoTREK consists of 14 multiwire drift chambers with a total area of 13 $m^2$ and makes it possible to register and to reconstruct tracks of charged particles of extensive air showers (EAS). The...
The purpose of the work is to investigate energy characteristics of Forbush decreases using coupling functions according to muon hodoscope URAGAN data. A coupling function shows relative contribution of primary cosmic rays with different energies to a count rate observed by a particular detector, so it is a basic tool to study energy characteristics of various modulation phenomena, such as...
In a new capacity, Einstein's idea of the equivalence of mass and energy is confirmed. The equivalence manifests itself in similar functionality in the processes of pulsations (focusing and bounce) of "excess" energy in the generalized 2D Kepler problem and "excess" mass in the 3D Vysikaylo-Chandrasekhar problem of cumulation and dissipation of de Broglie waves in quantum stars (pulsating...
More than 80 years after the discovery of UHECRs, many questions remain about possible sources, mechanisms of acceleration, propagation, and so on. An important aspect of research is the analysis of their motion in the magnetic field of the Galaxy, which implies, first of all, model calculations. New works devoted to such an analysis appear with the accumulation of experimental observations of...
M.E.Barinov, V.V.Biryukov, A.A. Borisov, S.V.Erin, R.M. Fakhrutdinov, A.P.Filin, V.N.Gushchin, A.N.Isaev, A.S.Kozhin, A.V.Larionov, M.M.Soldatov
The 10 sq.m muon hodoscope made of drift tubes with length 3.7 m and diameter 52 mm is under development and construction in NRC “Kurchatov institute” – IHEP. Totally 768 drift tubes are grouped into 6 identical multilayers, each consisting of two...
This paper studies the dynamics of proton flux in the South Atlantic Anomaly (SAA) region according to ARINA (was operated on the Resurs-DK1 satellite from 2006 to 2015) and VSPLESK (which was mounted on the ISS from 2008 to2013) satellite experiments. Both spectrometers have the same scheme.
The SAA drift is determined by the position of the maximum flux of high-energy protons with energies...
Since 2012 in the Experimental Complex NEVOD (MEPhI, Moscow), the PRISMA array for studying extensive air showers by detecting neutrons has been operated. In the array the en-detectors are used to detect neutrons. The detector consists of a thin (~ 30 mg/cm^2) inorganic scintillator ZnS(Ag)+6^LiF (the enrichment of Li with 6^Li isotope is 90%) and photomultiplier FEU-200, which are installed...
The article considers showers produced by primary particles with energies E0 ≥ 100 EeV. The showers were registered in the course of continuous long-term observations at the Yakutsk array of extensive air showers. In the present work, the mathematical processing of showers was repeated and the phenomenology of the charged component, muons with threshold thr, 1 GeV and radio emission in the...
On the basis of the Experimental Complex NEVOD, the URAN setup has been deployed which serves to detect the electron-neutron component of extensive air showers (EAS). This setup includes 72 scintillation detectors and covers an area of ~10^3 m^2. Registration of the neutron component by detectors is possible due to the ZnS(Ag) + B2O3 scintillator, where the content of the 10B isotope is 18%....
The Forbush decreases (FDs) are known as sharp drops in cosmic ray intensity, registered by different scientific equipment on Earth and interplanetary space. These events correlate with solar activity, mainly with coronal mass ejections (CMEs). CMEs spreads into interplanetary space and swap out the cosmic ray particles from the modulation region. The main features of FDs are the intensity...
The paper investigates the similarities and differences between Forbush decreases in solar cycles 23 and 24. The analysis was carried out for groups of events associated with different types of solar sources: coronal mass ejections from active regions accompanied by solar flares (CME1 group); filament eruptions outside active regions (CME2 group); high-speed streams from coronal holes (CH...
Antenna clusters located in the Tien Shan High Mountaine Scientific Station (TSHMSS) are designed for radio detection of Extensive Air Showers (EAS) of cosmic rays. The cluster consists of 4 radio antennas, which each of them consists of mutually perpendicular arcs distributed over an area of 1700 m2. The analog part of the measuring path consists of a SALLA type antenna. These high-frequency...
On entering the Solar System, galactic cosmic rays undergo solar modulation, which can be described with a modulation parameter defined by proton fluxes from neutron monitors. In particular, the modulation considerably distorts the fluxes of galactic cosmic-ray electrons and positrons with energies below 10 GeV. Taking into account known modulation potential, which also depends on the solar...
According to the long-term registration data from the small Cherenkov array of integral and Cherenkov differential detectors obtained the characteristics of air showers with energies above 3*10^15 eV, including of the maximum of the development of the Xmax. The dependence of Xmax on the shower energy found and the characteristics of air showers compared with the QGSjetII-04 model. From a...
IACT's are one of the key parts of the TAIGA observatory and design for study of gamma rays and charged cosmic rays in the energy range of 1013-1018 eV. One of crucial components of IACT is mechanical attachment point of mirror. It's consist of: mirror, heating cable and mirror alignment actuators. This poster will present the results of the modernization of the mechanical attachment point of...
A project of the OLVE-HERO space detector is proposed for CR measurement in the range 1012-1016 eV, which will include a large ionization-neutron 3D calorimeter with a high granularity and geometric factor of ~16 m2٠sr. Current OLVE-HERO main detector is expected to be an image calorimeter of a boron loading of plastic scintillator with a tungsten absorber. Such a calorimeter allows one to...
In this paper a new effect have been taken into account which has ever been
used before in physics, this effect related to two different ?elds, Quantum physics and General Relativity. This effect takes name: Time Dilatation as an Effect of Approaching Planck Length, this effect is completely different from the gravitational time dilatation in general relativity and time dilatation due to...
At present, the method of muonography (by analogy with X-ray radiography) of the internal structure of various objects of natural or artificial origin using the natural flux of cosmic ray muons has become widespread.
To implement this method, a mobile muon hodoscope (MMH) is being developed at the NEVOD Scientific and Educational Center (MEPhI). The design of the MMH is a multichannel...
The talk is devoted to the methods of reconstruction of parameters of extensive air showers based on the response of the NEVOD-EAS array. The NEVOD-EAS array is located in MEPhI and allows measuring deposited energy and arrival time of EAS particles. The development of reconstruction method is carried out using simulations produced by means of the CORSIKA program with the QGSJET-II-04 + FLUKA...
Sources of PeV cosmic rays (so called Pevatrons) can be identified by gamma and neutrino radiation with energy more than 100 TeV due to not destroyed trajectories by interstellar and galactic magnetic fields. In particular, one of such potential sources areas is considered to be the region of the double source PSR J2032+4127 in the Cocoon nebula in the constellation Cygnus. The ...
Since the middle of the last century, cosmic ray variations have been studied using data from a ground-based network of neutron monitors. To determine the energy spectrum of cosmic rays at the boundary of the magnetosphere, knowledge of the shape of the variation spectrum is required. In this work, to determine the spectrum of proton flux variations, we used the recently published precision...
This work presents a comparative analysis of the time changes in the secondary cosmic ray fluxes recorded by the detector modules of the L.N. Gumilyov ENU scientific complex during the period of powerful geomagnetic disturbances on 04.11.2021 and 13-14.03.2022. Noticeable changes in the geomagnetic indices, solar wind plasma velocity and the potential gradient of the surface electric field...
The large-scale coordinate-tracking detector TREK is being constructed at the Experimental Complex NEVOD (MEPhI, Moscow). It is designed to detect high-density muon bundles of inclined extensive air showers. It will significantly expand the capabilities of the experimental complex and ensure the progress in solving the «muon puzzle».
The main elements of the coordinate-tracking detector TREK...
We provide the indication of high flux of 40K geo-antineutrino and geo-neutrino (40K-geo-(ν¯+ν)) with Borexino Phase III data. This result was obtained by introducing a new source of single events, namely 40K-geo-(ν¯+ν) scattering on electrons, in multivariate fit analysis of Borexino Phase III data. Simultaneously we obtained the count rates of events from 7Be, pep and CNO solar neutrinos....
In the report we present the data on the development of a prototype of module for a solid-state detector of electron antineutrinos, which is based on a plastic scintillator for detecting positrons from the inverse beta decay (IBD) reaction. It is assumed that the complex of scintillation modules, supplemented with screens for detecting neutrons from IBD reaction using the ZnS(Ag)-6LiF (or...
Various mechanisms for the production and acceleration of positrons to energies of ∼ 10 GeV and above have been actively discussed since their excess in the PAMELA experiment was first detected. To test these theoretical models, measurements of positron flux at energies of ∼ 1 TeV and above are necessary. However, modern methods of registering cosmic rays do not provide an opportunity to...
To date, cosmic rays are the only tool that allows one to study nucleus-nucleus interactions at energies of hundreds of TeV in the center-of-mass system. Investigations of high-energy CR are carried out by detection of secondary particles of extensive air showers (EAS) formed in interactions of primary particles with the Earth's atmosphere.
Earlier studies of EAS revealed a number of unusual...
Long-term variations of thermal neutron background in Moscow, where EAS array ENDA-INR is running, are studied using en-detectors (developed in the INR RAS). EN-detectors based on the inorganic scintillation compound ZnS(Ag) + B2O3 with unenforced boron. The paper provides information about detectors stability and thermal neutron background variations including seasonal and weather effects.
The Tunka-Grande and TAIGA-Muon scintillation arrays are part of the TAIGA astrophysical complex. This complex is located in the Tunka Valley, 50 km from Lake Baikal and is aimed at solving fundamental problems of cosmic ray physics and gamma-ray astronomy in the energy range 10 TeV - 1 EeV.
In report we present description and status of arrays, scientific programs and the main results of the...
A simple formula for the total cross section \sigma_{\nu N} of neutral- and charged-current deep-inelastic scattering of ultrahigh-energy neutrinos on isoscalar nuclear targets is presented. The cross section \sigma_{\nu N} is proportional to the structure function F_2^{\nu N}(M^2_V/s,m_V^2) (M_V is the intermediate-boson mass and s is the square of the center-of-mass energy) with an...
