Description
https://zoom.us/j/91569101817 Friday
We present the results of the LVD experiment in the field of muon physics. The scintillation LVD detector is used to study cosmic ray muons with mean energy of 280 GeV at an average depth of 3.6 km w.e. The experiment has been going on since 1992 at the Gran Sasso underground laboratory, Italy. During 28 years of work, the characteristics of the muon flux, its dependence on depth and seasonal...
Underground cosmic-ray experiments, including very large volume neutrino telescopes, depend on a precise description of the interaction cross sections of muons, which can travel large distances before reaching the detector. High-energy muons lose their energy almost exclusively via four processes: ionization, electron-positron pair production, bremsstrahlung and inelastic nuclear interaction....
Data of NEVOD-DECOR experiment on investigations of inclined cosmic ray muon bundles for a long time period (May 2012 – May 2020) are presented. Their comparison with the results of calculations based on simulations of extensive air shower hadron and muon components in the framework of an approach of local muon density spectra allows one to study the energy spectrum and mass composition of...
One of the actual problems in the ultrahigh-energy cosmic ray (UHECR) physics is the excess of multi-muon events in comparison with calculations, which is called the “muon puzzle”. An excess of muons appears in the energy range of the extensive air showers (EAS) above 10^17 eV. The answer to the “muon puzzle” may be found by means of the study of the energy characteristics of the muon...
A novel wide-angle imaging air Cherenkov telescope with a SiPM based camera is being developed for the TAIGA hybrid installation. The design of the telescope optical part is discussed. The telescope is planned to have a wide field of view up to 15–20 degrees and an aperture up to 1 $m^2$. The ray-tracing simulations of optical schemes properties were done using specially developed program. The...
Galactic cosmic rays (GCRs) undergo diffusion by plasma wave interactions, nuclear reactions with interstellar gas and other processes during their propagation. A good knowledge in the spallation cross sections is a key ingredient to study this diffusion since the formation of secondary CRs keeps track of the amount of matter traversed. In this work, we perform different analyses of the...
The High Energy Cosmic Radiation Detection (HERD) facility proposed onboard the future Chinese Space Station (CSS) in 2026 will provide high-quality data on charged cosmic rays and gamma rays from GeV to PeV energies. Because of this capability, the HERD experiment could give valuable contributions to several scientific topics, including dark matter searches, the study of the cosmic-ray...
Astrophysical experiments in Antarctica use radio detection of cosmic rays and neutrinos. Radio waves are produced via the Askaryan effect from neutrino-induced cascades in the South Pole ice. In this work, the triboelectric effect as a possible source of background for such neutrino experiments is studied. The friction on the ice surface during high wind may result in static discharge, which...
A review of experimental search for WIMPs (Weakly Interacting Massive Particle) of dark matter with noble gas based two-phase emission detectors is given. The following experimental programs: ZEPLIN, XENON, LUX, LUX-ZEPLIN, PandaX, DarkSide are presented.
Our work reviews the planned space-based gamma-ray telescope GAMMA-400 and evaluates in details its opportunities in the field of dark matter (DM) indirect searches. We estimated the GAMMA-400 mean sensitivity to the diphoton DM annihilation cross section in the Galactic center for DM particle masses in the range of 1-500 GeV. We obtained the sensitivity gain at least by 1.2-1.5 times...
The generation of solar cosmic rays occurs during explosive energy release in a solar flare, so in order to understand this phenomenon it is necessary to study both the mechanism of the solar flare and the process of particle acceleration by the generated electric field. It is necessary to investigate the processes of explosive release of energy and acceleration of charged particles occurring...
Muons are the dominant event signature for neutrino telescopes like IceCube and are the main background for neutrino searches.
Furthermore, they are used to investigate extended air showers.
In both cases, the stochasticity of the muon propagation is one key to perform the data extraction and an accurate understanding even of the edge cases is crucial.
The main process driving stochastic...
PROPOSAL is a Monte Carlo simulation library, usable both in C++ and via a python wrapper, used to describe the propagation of highly energetic particles.
Originally designed to provide a precise description of muon and tau propagation, recent updates introduced both photon propagation as well as a more precise implementation of electron and positron propagation.
Due to its modular code...
We revisit the Polyakov Loop coupled Nambu-Jona-Lasinio model that maintains the Polyakov loop dynamics at zero temperature, which is the most interesting for astrophysical applications. For this purpose we re-examine potential for the deconfinement order parameter at finite baryonic densities. Secondly, and the most important, we explicitly demonstrate that naive modification of this...
We study an impact of asymmetric dark matter on properties of the neutron stars and their ability to reach the two solar masses limit, which allows us to present a new range of masses of dark matter particles and their fractions inside the star. Our analysis is based on the observational fact of the existence of three pulsars reaching this limit and on the theoretically predicted reduction of...
The top quark, the heaviest quark and, indeed, the heaviest elementary particle known today, constitutes a novel probe of the long-lived medium in quark-gluon phase which, as expected, can be produced even in light nuclei collisions at ultra-high energies. Some distinctive features are considered for particle production in the top sector in ultra-high energy domain. The single top production...
In this paper, a new effect has been taken into account which has ever been
used before in physics, this effect related to two different fields, 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...
The PAMELA experiment with magnetic spectrometer operated almost ten years on board of the Resurs DK1 satellite. The satellite was launched on 15 June 2006 on polar orbit with an inclination of 70°and an altitude of 350–610 km. The spectrometer continuously measured charged cosmic ray particles in wide energy range from about 50 MeV up to several TeVs. In this work the spectra of electrons and...
The asteroid 1I/'Oumuamua (A/2017 U1) and the cometary-like object 2I/Borisov (C/2019 Q4) are the first two objects of interstellar origin discovered in our Solar sysyem. They approched the Earth in October 2017 and in December 2019 respectively. A gamma-ray emission is expected from these objects due to interaction of Cosmic Rays (CRs) with their surfaces, while more exotic models...
The method of the search for hidden photons by a multicathode counter is described. First results of the search for dark photons are presented. Fiture prospects to observe the diurnal variations of the count rate from dark photons using an array of counters placed in mines at different geographical latitude are oulined.
Authors: A. Dominguez, L. Tibaldo, M. Ajello, M. Lemoine-Goumard for the
Fermi-LAT collaboration and L. Saha, S. Marchesi, M. Lopez
Abstract: The identification of major contributors to the observed
Cosmic Rays (CRs) is a prime objective to resolve this long-standing
puzzle. Star-forming regions (SFRs) may be one of these potential
contributors, in fact, the detection of gamma rays from the...
The event of astroparticle collision at high energy was detected in 1975 during
the balloon flight in stratosphere. The hundred particle tracks in x-ray films have been re-analyzed in the style of LHC experiments: rapidity distributions of charged particles and transverse mass spectra of multiparticle production have been built. The comparison of multiple rapidity-and-Mt histograms with the...
Several thousands of gamma-ray bursts were observed by various experiments, and during several GRBs very high-energy photons were detected both in space and ground-based experiments (up to some tens of GeV and up to some TeV, respectively). For example, GRB 190114C was detected by Fermi and MAGIC in very wide band up to subTeV energies. 18 photons were observed by Milagrito in energy band...
Blazars can show variability on a wide range of timescales, however, whether this variability displays a specific pattern or not is still an open issue. In this context, the search for periodicity in the gamma-ray emission from blazars is an on-going challenge. In this talk, we present the results from Peñil et al (2020), where we use the first nine years of gamma-ray data collected by the...
The physics motivations and advantages of the TAIGA (Tunka Advanced Instrument for cosmic ray physics and Gamma Astronomy) array are presented. TAIGA aims to addresses gamma-ray astronomy at energies from a few TeV to several PeV, as well as cosmic ray physics from 100 TeV to several EeV and astoparticle physics problems. For the energy range 30 – 200 TeV the sensitivity of 10 km^2 area...
TAIGA array (Tunka Advanced Instrument for cosmic ray physics and Gamma-ray Astronomy) addresses gamma-ray astronomy at energies from a few TeV to several PeV as well as cosmic ray physics from 100 TeV to several EeV. A 1 km$^2$ TAIGA setup will consist of a Cherenkov timing array TAIGA-HiSCORE with 120 wide-angle detectors, three Imaging Air Cherenkov Telescopes (IACTs) with the FoV diameter...
The shape of redshift distribution for uniform sources set in our Metagalaxy defined by cosmological parameters and properties of space is Euclidean at small redshifts and de-Sitter at z>0.7. Firstly the parameters of our Metagalaxy Ω and $\Lambda$ were determine due sample of Ia supernovae from the Supernova Cosmology Project analysis in 1998. Now several thousands supernovae characteristics...
The novel array for Extensive Air Shower (EAS) study consisting of 16 electron-neutron detectors was constructed in INR RAS in Moscow. The novel technique of simultaneous recording of EAS and background variations was developed and realized using 32-channel FADC produced by CAEN. Pulse shape selection was realized in the software and tested with the neutron source. Detectors calibration was...
