The NEVOD-EAS air shower array is being created in MEPhI in frames of the Russian-Italian collaboration NEVOD-DECOR. The installation is aimed at independent estimations of the size, axis position and arrival direction of extensive air showers (EAS) registered with other detectors of the Experimental complex NEVOD. This information will provide calibration of two novel perspective techniques...
Comparison of data obtained by means of two facilities during thunderstorm periods of spring and summer of 2018 has been performed. Muon snapshots (muonographs) and meteorological maps obtained every ten minutes are compared with each other. Distributions of basic parameters describing variations of the muon flux during and before thunderstorms are obtained. Fourier and wavelet analyses of...
For studying muon bundles arriving at various zenith angles, the method of the local muon density spectra (LMDS) is used at the experimental complex NEVOD-DECOR (MEPhI, Moscow). Estimation of the primary particle energy by means of this method has a rather low accuracy – σ(lgE0) ~ 0.4 – due to contribution of extensive air showers (EAS) registered at different distances from the axis to the...
Coronal mass ejections (CME) have an impact on the flux of cosmic rays that penetrate the disturbed areas in the heliosphere and the near-terrestrial space. Unlike most ground-based cosmic ray detectors, the URAGAN muon hodoscope (MEPhI) allows to investigate both the integrated counting rate of registered particles and the spatial and angular characteristics of the muon flux at the ground...
Tunka-Rex is a sparse antenna array, detecting radio emission from cosmic-ray air showers. It works in the frequency band of 30 to 80 MHz and consists of 63 station, equipped with SALLA antennas. Tunka-Rex operates jointly with other detectors of the TAIGA (Tunka Advanced Instrument for cosmic ray physics and Gamma Astronomy) facility, the scintillator array Tunka-Grande and the air-Cherenkov...
The excess of muons in observed extensive air showers with respect to Monte-Carlo simulations shows up itself in the data of various experiments and under different conditions. We present a comparative quantitative analysis of the muon content of showers observed at various energies, zenith angles, core distances etc. by several experiments.
DANSS is a highly segmented detector, which contains 2500 one meter long plastic scintillator strips. The DANSS detector is placed under industrial reactor of the Kalinin Nuclear Power Plant. The distance to the core is varied on-line from 10.7~m to 12.7~m, and the primal task of experiment is a search for short-distance neutrino oscillations. This work contains results of the cosmic muons...
LUX-ZEPLIN (LZ) is a second-generation dark matter experiment to be installed 1480 m underground at the Sanford Underground Research Facility (SURF) in South Dakota, USA. The LZ detector is a dual-phase (liquid/gas) time projection chamber with active volume containing 7 tonnes of highly-purified xenon. The experiment will be looking for evidence of galactic dark matter in the form of Weakly...
The results of the search of hidden-photon dark matter by means of a multi-cathode counter are presented. The technique is based on counting of single electrons emitted from outer cathode as a result of the conversion of hidden-photons. The apparatus and the calibration of the counter by ultraviolet lamp are described and the data processing is outlined in details. It is shown that this...
The DArk Matter Particle Explorer (DAMPE) is a high-performance space particle detector launched in orbit on 17 December 2015 by a collaboration of Chinese, Italian and Swiss scientific institutions, coordinated by the Chinese Academy of Sciences. It consists of a high-resolution segmented BGO electromagnetic calorimeter with a depth of 31 radiation lengths, a silicon-tungsten...
The CRESST-III (the third stage of the Cryogenic Rare Event Search with Superconducting Thermometers) is a direct dark matter (DM) search experiment, located at the Laboratori Nazionali del Gran Sasso in Italy, where an overburden of 1400m of rock (3800m water equivalent) provides an efficient reduction of the cosmic radiation background.
In the first phase of the CRESST-III experiment,...
Over its ten years of mission the Large Area Telescope onboard the Fermi Gamma-ray Space Telescope has collected the largest ever sample of high-energy cosmic-ray electron and positron events. Possible features in their energy spectrum could be a signature of the presence of nearby astrophysical sources or of more exotic sources, such as annihilation or decay of dark matter (DM) particles in...
The REcoil Directionality project (ReD) aims at investigating a novel observable
for directional dark matter detection in next generation liquid argon detectors. A small liquid argon dual-phase TPC of innovative design will be exposed to a neutron beam produced at the Laboratori Nazionali del Sud (LNS, Italy) Tandem accelerator to investigate "columnar recombination” effects.
The modern detection of giant flares on the star dwarfs of the class G with the energy significantly exceeding the energy of the solar flares indicates the possibility of proton acceleration beyond the boundary of the solar system to energies significantly greater than the energy of solar cosmic rays. The superflare generation with the energy much larger than energy of big solar flares on a...
The origin and acceleration mechanism of ultrahigh-energy cosmic rays (UHECRs) are of the upmost importance in particle astrophysics and astronomy. The Telescope Array Experiment (TA) is the largest cosmic ray detector in the Norther hemisphere, located near the town of Delta in central Utah, USA. TA consists of a surface detector array overlooked by fluorescence detectors and covers a ground...
We discuss ultra-high energy cosmic rays from supermassive black holes and their contribution to the particle flux on the Earth along with diffuse gamma-ray emission and cosmogenic neutrino flux. Several processes of particle acceleration in supermassive black holes are suggested in literature, based on which various particle injection spectra are considered in this paper. Cosmic ray spectra...
Nuclei and isotopes of secondary origin are important tools to understand and model the propagation of cosmic rays (CR) through the Galaxy.
We report on the observation of new properties of secondary cosmic rays Li, Be, and B measured in the rigidity (momentum per unit charge) range 1.9
GV to 3.3 TV with a total of 5.4 million nuclei collected by AMS during the first five years of operation...
The neutron spectra induced by the flux of primary cosmic radiation, taking into account its absorption in the atmosphere and the generation of neutrons in the energy range 0.05-1 GeV has been estimated. An estimate of the neutron flux with energy above 1 GeV is approximately 0.3 $particle/m^2/s/sr$. An evaluation of the neutron flux has been conducted to realize a ground-based experiment to...
The PAMELA experiment has measured the electron and positron fluxes at Earth orbit from June 2006 till January 2016. The spectra have been evaluated in wide energy range from several tens MeVs till several TeVs. Measurements were carried out during the A<0 solar minimum of solar cycle 23 till the beginning of A>0 epoch. These measurements provide important information to study cosmic ray...
In this talk we present an analysis of the Unfold technique for reconstruction of the truth distribution of the measured experimental value. To test we select a particle's rigidity measured by magnetic track system of PAMELA spectrometer, obtained by simulations of the device with Geant4 Monte-Carlo simulation. A modern popular unfolding techniques was analyzed: D'Agostini, SVD and L-curve. It...
