In planetary atmospheres, runaway electron avalanches could happen due to large scale electric fields, which accelerate electrons to energies about 0,1 - 10 MeV. This phenomenon is not fully understood. Nowadays, most of the data is obtaining using satellites on low orbits. However, breakdown can also occur at altitudes of less than 30 km. In this case, most of the radiation is scattered...
In the present research, the analysis of experimental elastic scattering angular distributions data of alpha particles on 28Si nuclei carried out using SFRESCO computational code in the energy range from 18 to 240 MeV. The data were analyzed using phenomenological Woods–Saxon (WS) potential within the context of the optical model (OM). We created the real potentials in the double-folding (DF)...
GAMMA-400 space-based gamma-ray telescope represents the core of the scientific complex intended to perform a search for signatures of dark matter in the cosmic gamma-emission, measurements of diffuse gamma-emission characteristics, investigation of extended and point gamma-ray sources, studying of high energy component of gamma-ray bursts and solar flares emission. Prototypes of...
The NA61/SHINE detector at the CERN SPS is undergoing a major upgrade during the LHC Long Shutdown 2 period (2019-2021). The upgrade is essential to fulfil the requirements of the new open charm measurement program. In this program detector will operate at a beam intensity increased by a factor of 10, which requires an upgrade of current Beam Position Detectors (BPDs). New BPDs should monitor...
The Forward Hadron Calorimeter is one of the sub-detectors of the BM@N experimental setup at JINR, Dubna. It consists of 54 lead-scintillator modules of two types with the transverse sizes 20x20 cm$^2$ and 15x15 cm$^2$. These two types of modules are subdivided into 10 and 7 individual longitudinal sections, respectively. Each section provides the independent light and amplitude signal...
Scintillation detectors with organic scintillators are widely used for fast neutrons detection in high gamma ray background. This is a way to solve the problem of measuring the combined gamma-neutron background in a large number of studies: registration of backgrounds near accelerators; monitoring of spent nuclear fuel; monitoring of neutron flux in nuclear fusion installations; measurement of...
An application of deconvolution to signal peak finding in readout ASIC for GEM detectors is described. Unlike the traditional approach based on the use of an analog or digital peak detector, it is proposed to use the deconvolution technique to find the signal peak. In this case the digital data coming from the ADC are processed by a digital filter that deconvolves the data according to the...
The results of the study of the hardware function (HF) of the muon hodoscope (MH) URAGAN (MEPhI), based on mathematical modeling, are presented. A multi-parameter HF model has been formed. A hypothesis is accepted about the model function of the input distribution of the intensities of muon fluxes (MF). A functional is introduced that determines the difference between the matrix data of the...
The mathematical model is discussed allowing the description of relativistic electron beam propagation in rared plasma. Such model may be applied for the analysis of the electron beam behavior in accelerators as well as under space conditions. The equation for the beam radius and the results of its numerical solution are presented.
The Compressed Baryonic matter Matter experiment (CBM) is one of the major experimental projects at the constructed FAIR facility in Darmstadt, Germany. It will explore strongly interacting nuclear matter at highest net-baryon densities in nucleus-nucleus interactions. A novel, free-streaming data acquisition system will be used at this experiment, which aggregates the data sent by the...
The ATLAS collaboration at LHC has chosen the Large size multi-gap resistive strips Micromegas (MM) technology along with the small-strip Thin Gap Chambers (sTGC) for the high luminosity upgrade of the first muon station in the high-rapidity region, the so called New Small Wheel (NSW) project.
The NSW is expected to be installed in the ATLAS underground cavern in the current long shutdown. ...
A prototype analog channel with digital processing system for read-out signals coming from GEM detectors is presented. Each channel consists of a CSA, shaper and followed by a 10-bit ADC. Data from ADC processing by digital system based on an interpolator for finding the signal peaks in the digital domain. Interpolation allows us to find the fit curve function, which passes through a given...
The task of detecting fast neutrons in the presence of gamma radiation is successfully solved using scintillation detectors with special organic scintillators. However, when operating with a scintillation detector near particle accelerators, there is a problem associated with the presence of a magnetic field near the accelerator.
A new efficient detector for mixed neutron and gamma fields is...
The behaviour of a photon is strange. It possesses both wave nature and
particle nature. Some experiments show both behaviours of photons can
coexist simultaneously, while some other experiment state that both
properties do not coexist simultaneously. According to electromagnetic
theory, the rest mass of photon in free space is zero and also photon
has non zero rest mass, as well as...
A method for searching for heliospheric disturbances and Forbush decreases in time series of two-dimensional data matrices of the URAGAN muon hodoscope (MEPhI) using decision rules for sequences of confidence intervals is considered. A sequence of two-dimensional angular matrices of the muon hodoscope are interpreted as time series of random numbers, which are distributed according to the...
A search for supersymmetry in events with four or more charged leptons (electrons, muons and taus) is presented. The analysis uses a data sample corresponding to 139 fb-1 of pp collisions delivered by the Large Hadron Collider at sqrt(s) = 13 TeV and recorded by the ATLAS detector. Four-lepton signal regions with up to two hadronically decaying taus are designed to target several...
The solution of the problem how to register fast neutrons in the presence of intense gamma radiation is required when solving such fundamental and applied problems as registration of the neutron and gamma background in underground low-background experiments (the low background detectors of the neutrino and dark matter); beam diagnostic at particle accelerators; radiation monitoring at nuclear...
The modern trend in developing of the transmission x-ray scanners based on fast scintillators and SiPMs arrays combining gamma pulses counting and amplitude selection methods. Such scanners can be very attractive for medical imaging and human/luggage inspection. These applications require commercially available, cheap scintillators with high brightness, high density, good linearity and energy...
The future γ-ray telescope GAMMA-400 will provide fundamentally new data on discrete sources and spectra of γ-ray emissions and electrons + positrons due to it's unique angular and energy resolution in wide energy range from 20 MeV up to several TeVs.The gamma-ray telescope consists of the anticoincidence system, the converter-tracker, the time-of-flight system, the position-sensitive and...
Using the Gribov-Glauber model for photon-nucleus scattering and a
generalization of the vector meson dominance model for the hadronic
structure of the photon, we calculate cross-sections of light and heavy
vector meson photoproduction in ultraperipheral Xe–Xe collisions at 5.44
TeV at the Large Hadron Collider. Analyzing the momentum transfer
distribution in this process, we examine the...
The muon spectrometer of the ATLAS detector will undergo a major upgrade in order to cope with the operational conditions at the high-luminosity LHC. The trigger and readout system will need to support Level-0 trigger rates of 1 MHz and a latency of 10 us.
The readout electronics of all the trigger and precision chambers will be replaced and the precision chambers, currently not included in...
The previous theoretical studies in scope of Non-Inflationary Cosmology (NIC), regarding the program OLIMPIA and several theoretical aspects of heavy elements’ synthesis [1], previously have been carried out in frame of NIC’s concepts [2-6]. Recently, the theory of NIC revealed a new cosmological phenomenon concerning the possibility “gravitons’ entanglement” in the Universe [7], the broad...
We perform energy dependence study for underlying event activity in hadron-hadron collisions by using monte-carlo event generators HERWIG++, MADGRAPH and PYTHIA8 with different tunes. Study is performed at various energies between 1 TeV to 14 TeV. The underlying event activity is important for the complete understanding of standard model processes and also for the search of new physics beyond...
We present test-station designs for testing the latest version of a switch-mode power supply for the front-end electronics of the ATLAS hadronic Tile Calorimeter (TileCal) at the LHC. We further discuss the steps taken to test the new TileCal LVPS (Low Voltage Power Supply), using a custom-based software to perform tests and graphically display and record all performance metrics. The test...
Known ideas about them are based on the behavior of particles in a cosmological vacuum. There are searches for particles that make up dark matter. These include axions, neutrinos, WIMP particles. Gravitation is explained by the law of universal gravitation. Repulsion of particles is not clear. The nature of repulsive forces is unclear. However, the runoff of galaxies from the Universe and the...
TAIGA-HiSCORE is an extensive air shower array of 121 Cherenkov detectors spread over an area of 1 km$^2$. It is designed to detect cosmic rays with energies from 50 TeV to 1000 PeV. Also TAIGA-HiSCORE is planned to use for gamma-ray astronomy in cooperation with the other setups of the TAIGA observatory. This work is dedicated to the analysis of the TAIGA-HiSCORE single-mode data. We consider...
Up to date analysis of velocity and isotope distributions of light fragments obtained in the projectile fragmentation reactions of 18O at 35 MeV/nucleon on 9Be and 181Ta targets measured at COMBAS fragment separator at the U400M Research Facility in JINR [1] are presented. The results of velocity spectra analytical parametrization and isotopic ratios are compared with the ones obtained in the...
We study some properties of kink solutions of a model with
non-polynomial potential obtained by deforming the well-known
$\phi^6$ field model. We consider the excitation spectrum
of the kink. We also discuss the properties of the `kink+antikink'
system as a whole that are not inherent to a solitary kink or antikink.
In the diffuse supernova neutrinos search and comprehensive geoneutrino analysis Borexino collaboration for the first time considered atmospheric neutrinos as a background source. Atmospheric neutrinos interact in many ways with the nuclei constituting the Borexino scintillator. Some of interactions can mimic the inverse beta-decay event signature used in these analyses, with expected yield of...
To predict and interprete the results of reactor antineutrino experiments, precise theoretical knowledge of the antineutrino spectrum is needed. Reactor antineutrinos are produced in beta-decay of fission products, so, in general, any correction to individual beta-spectra will show up in the resulting antineutrino spectrum.
We discuss the influence of atomic effects (such as screening,...
In a wide class of accelerator experiments with charged particles, an important task is to determine the coordinates of their stops. In this paper, a method for determining the stops of pions and muons based on the use of semiconductor detectors (PCDs) has been proposed and experimentally tested. Based on the performed measurements, dependence has been obtained that allows determining the...
Сonvolutional neural networks are currently used in various fields of science, technology, as well as in experiments related to particle physics. In this work, this technique was applied to create an alternative method and improve the existing method for position reconstruction in DarkSide-50 experiment.
We deduce the $D$-nucleon interactions from the even odd QCD sum rules. Unifying the chiral SU(3) model, we study the in-medium mass splitting between pseudoscalar $D$ and $\bar D$ meson in the hot and dense asymmetric nuclear matter. The medium modified quark and gluon condensates are evaluated from the chiral SU(3) model and further plugged into the even odd QCD sum rules to compute the...
The GAMMA-400 gamma-ray telescope is planned for the launch at the end of this decade on the Navigator service platform designed by Lavochkin Association on an elliptical orbit with following initial parameters: an apogee ~300000, a perigee ~500 km, a rotation period ~7 days and inclination of 51.4º. The apparatus is expected to operate more than 5 years, reaching an unprecedented sensitivity...
The dynamics of a space endowed by a metric of the 3-dimensional sphere in the framework of f(R)-gravity acting in D=4 from the creation at high energies is studied. Spaces of finite size are found as a result of exact solution of the classical equations of motion. The influence of the parameter values and initial conditions on the behavior of the solution is discussed. Generalization of the...
In the paper, the photons absorption rate in a relatively
strong magnetic field in the Compton process taking into account the
resonance on the virtual electron are calculated. A comparative analysis
obtained result with a nonresonance case was carried out.
Magnetic clouds affect the intensity of galactic cosmic rays. The diffusion mechanism is usually considered as the formation mechanism for Forbush decrease (FD) in a magnetic cloud. An FD is an observed decrease in the intensity of cosmic rays. There is a new theory of FD formation, in which the mechanism is the loss of particle energy in the electromagnetic field of a magnetic cloud. The...
In this work, the experimental data on thermal neutron flux registered by the “Neutron” setup on the Earth's surface for the period from May 2015 to February 2019 were analyzed. The Forbush decreases (FD), arising from the influence of solar activity on the flux of cosmic rays, as well as the lunar cycles associated with an increase of the release of radioactive radon due to the occurrence of...
Based on the explicit formulas found for the kink solutions of the $\phi^8$ model, we show that for certain values of the constants, kink-like solutions with power-law asymptotics arise in the model, describing, in particular, thick domain walls. Objects of this kind could be of interest for modern cosmology.
One of the consequences of Einstein’s general theory of relativity is bending of light as it passes through a gravitational field and it has been one of the first and most important results of general relativity. Some of the most important applications of gravitational lensing in cosmology are to study the large-scale distribution of matter and dark matter in the universe and specifying the...
The Tile Calorimeter (TileCal) is the central hadronic calorimeter ($|eta| < 1.7$) of the ATLAS experiment, made out of iron plates and plastic scintillators. The TileCal is divided into three cylinders along the beam axis, each of which is azimuthally segmented into 64 wedge-shaped modules, staggered in the $\phi$ direction. TileCal online software is a set of Trigger and Data Acquisition...
The interactions between $\eta$-meson and nucleons are studied by the unification of chiral SU(3) model and chiral perturbation theory. The $\eta$ and nucleon interactions for the next to leading order terms are derived by expanding the $\eta N$ interaction Lagrangian term within the chiral perturbation theory. Using the chiral SU(3) model, we calculate the in-medium scalar density, $\rho_s$...
Kaons and antikaons in multi-phase transport model
Department of Physics, Dr. B. R. Ambedkar National Institute of Technology,Jalandhar (Punjab) 144 011, India
Abstract
We investigate the impact of medium modifications of kaons and antikaons on their rapidity distributions, production ratio as well as the flow...
Application of machine learning (ML) algorithms in high-energy physics is evolving rapidly. One of the ways to improve the analysis of experimental data is to optimize track selection criteria. UsingMonte Carlo simulations, one can train ML classifiers to separate correctly reconstructed primary tracks from secondary and fake tracks based on their features such as a number of clusters in TPCs,...
The paper presents analysis of showers with energy E = 5-50 EeV and zenith angle less than 60 degrees. A quantitative estimate was obtained for muons with a threshold greater than 1 GeV at different distances from the shower axis, and the fraction of muons at a distance of 600 m from the axis. An empirical relationship was found between the fraction of muons and the longitudinal development of...
In the Standard Model of particle physics, CP violation arises due to a single complex phase in the Cabibbo–Kobayashi–Maskawa (CKM) quark mixing matrix. Precise measurements of the CKM parameters therefore constrain the Standard Model, and may reveal new physics effects. The measurement of the time–dependent decay rates of Bs -> J/ψϕ provides a theoretically clean method for extracting...
The measurements of the prompt and non-prompt differential cross-sections of J/ψ and ψ(2S) mesonsin high transverse momentum range are reported. The measurements of the non-prompt fractions of ψ(2S) and J/ψ, and prompt and non-prompt production ratios of ψ(2S) to J/ψ are also presented. The analysis is performed using pp collision data recorded by the ATLAS detector at √s = 13 TeV during Run 2...
The TAIGA Gamma-Observatory is a new hybrid detector, located in the Tunka Valley. It is being created to solve a wide range of fundamental problems of very high energy gamma astronomy and astroparticle physics. In order to obtain a clear image in the IACT, which is necessary for evaluating the event parameters and gamma-hadron separation, it is very important to correctly adjust the telescope...
The paper presents an analysis of the characteristics of muons with a threshold greater than 1 GeV in showers with energies greater than 5 EeV and zenith angles less than 60 degrees. The analysis is based on the registration data of extensive air showers of the Yakutsk array. Estimation of muons at different distances from the shower core, fraction of muons $\rho_\mu / \rho_{\mu+e}$ at a...
A new effect has been taken into account which has ever been used before in physics, this effect related to two different fi 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 closing to the...
The experiment was conducted at the HI-13 tandem accelerator at the China Institute of Atomic Energy (CIAE) in Beijing. Two different methods of deuteron detection were used: 1) a Q3D magnetic spectrometer at small angles (5–19 degrees in lab. system); 2) at medium and large angles - ΔE-E technique. Differential cross sections of the $^{9}$Be(d,d)$^{9}$Be scattering at E(d) = 23 MeV were...
An analysis of vector-boson-fusion production of Higgs bosons in the H → WW* → eνμν decay channel is presented. The proton-proton collision data used in this result were produced at the LHC with a center-of-mass energy of 13 TeV and recorded by the ATLAS detector between 2015 and 2018, corresponding to the full Run 2 integrated luminosity of 139 fb−1. Novel multivariate techniques are employed...
The movement of an electron in the nucleus field of a hydrogen atom consisting of one proton in a stationary orbit representing a circle is known to occur without radiation. The curvature of the orbit is determined by the action of the electric field of a practically fixed proton on a moving electron. A flat case is considered when the orbit circumference lies in a fixed plane of rotation. The...
In the physics of cosmic rays, there has always been a question about the primary particles that generate extensive air showers. This was especially true for particles with highest energies, since it is unclear nature of sources and mechanisms in outer space that produces such particles.
To study the nature of particles with energies greater than 5 EeV, the database of the Yakutsk array was...
Three-body $NN\bar K$ model for the "$ppK^-$" quasi-bound kaonic cluster is considered on the basis of the configuration space Faddeev equations. A single-channel approach is used taking into account the difference of nucleon and kaon masses as well as the charge independence breaking of nucleon-nucleon interaction. Two sets of the particle configurations, $ ppK^-$, $np \bar {K^0}$ and...
Correlation femtoscopy provides information about the space-time structure and evolution of the fireball created in ultrarelativistic ion-ion collisions. The dependence of the femtoscopic radii on the transverse pair momentum and
charged particle multiplicity of an event reflects the mechanism of collective behaviour. In this work, the femtoscopic radii of the charged pions were calculated...
The spectroscopy of charmonium-like mesons with masses above the 2_mD open charm threshold has been full of surprises and remains poorly understood [1]. The currently most compelling theoretical descriptions of the mysterious XYZ mesons attribute them to hybrid structure with a tightly bound cc\bar diquark [2] or cq(cq)\bar tetraquark core [3 - 5] that strongly couples to S-wave DD\bar...
The Tile Calorimeter (TileCal) is a sampling hadronic calorimeter and an essential part of the ATLAS experiment at the LHC. The active material is made of plastic scintillating tiles, and the light produced in the scintillators is transmitted to the photomultiplier tubes by wavelength shifting fibres. During the High Luminosity LHC (HL-LHC) program, the luminosity can reach a value seven times...
LEGEND is a ton-scale $^{76}$Ge-based experimental program to search for neutrinoless double-beta
decay with the discovery potential at a half-life greater than 10$^{28}$ years. The discovery of this decay
would establish that the neutrino is its own antiparticle, which would have several implications in explaining the matter-antimatter asymmetry in our universe. The first stage, LEGEND-200,...
Several recent CMS results on B hadron decays into the final states including the charmonium resonance are reported. The analyses are performed using pp collision at 13 TeV data collected by the CMS experiment.
The Identity Method (IM) is a mathematical tool that allows one to solve the problem of misidentification in the analysis of moments of particle distributions. This method was successfully used for corrections of the first and second moments in NA61/SHINE and ALICE experimental data. In this work, it is shown how the Identity Method could be used in a non-standard way, namely, for correction...
Blackhole remnants are one of the most exotic remnants in our universe, leaving behind several unsolved paradoxes. Resolving the black hole information paradox, in particular, can direct us to numerous engrossing discoveries and provide a decent understanding of the unsolved conventional theories. We readdress the notions underlying the paradox explicitly, beginning from the basic principles....
Forbush decrease (FD) is an effect in the cosmic ray physics which is characterized by sharp short-term decreases in cosmic ray intensities recorded by satellite and ground-based instruments. Nowadays it is well established that coronal mass ejections (CMEs) are the main drivers of FD. A huge amount of solar plasma is thrown into interplanetary space during CMEs. This plasma propagates...
Supersymmetry, or SUSY, is one of the proposed extensions of the Standard Model which represents a solution to some of the limitations of the latter, such as the hierarchy problem. It introduces new particle states which may be produced at the ATLAS experiment taking data at sqrt(s)=13 TeV at the Large Hadron Collider (LHC). Due to existing constraints on the value of the masses of strongly...
After several years of running of the LHC, new physics has not yet been found. Therefore one of the best hopes for discovering new physics is exploring the difficult to access corners of phase space, such as low mass regions where collecting the data is challenging. Data scouting or trigger level analysis is one such way to achieve this. This special dataflow, which utilises event-size...
NA64 experiment at CERN SPS is designed for direct and missing energy search for dark sector particle decays in sub-GeV range. Assuming an existence of new effective force between dark sector and ordinary matter, transmitted by a new massive gauge boson, one can perform a search for such a particle in an active beam dump experiment like NA64. Dark sector particles may be produced in...
Nowadays calorimetry plays a key role both in experimental studies in high-energy physics and in applied research. For charge particles energy identification with high energy resolution the new methods of digital calorimetry can be applied [1]. The digital electromagnetic calorimeter consists of several segmented layers and counts the total number of beam particles passing through the detector...
We will present some measurement results of the yield ratio of the high spin state to the low spin state of the isomeric pair for some isomeric products in the natural tellurium by photo-nuclear reaction. The experiment was performed by irradiating tellurium samples with bremsstrahlung end-point energies of 60-70 MeV by activation and the off-line ray spectroscopic technique, using the 100 MeV...
Dynamic chaos is observed experimentally in macro objects, but did not receive a proper explanation. To take it into account in the quantum representation of the particle motion, an attempt was made to introduce a random component into the equation of motion. Its magnitude depends on the intrinsic energy of the particle, equal to the resting energy. The total energy of the particle is equal to...
Preliminary results of the investigation of the properties of 7 clusters of galaxies from CfA2 redshift survey are discussed in the presented poster. Clusters 933, 142, 1046, and 1652, which have several pecularities of the spatial distributions of galaxies. Moreover, these objects have high-energy gamma associations on Fermi/LAT data (4FGL J1144.9 + 1937, 4FGL J0152.2 + 3714, 4FGL J1230.8 +...
THEORY TO PROOF THE EXISTENCE OF DARK ENERGY
We Earthlings are leaving in a world of 15 percentage of observable universe. The universe which we led life is because of the remaining percentages of dark matter and dark energy which is not anti particle or made of dark material. Most of our universe is hidden in plain sight. Though we can’t see or touch it, most astronomers say the majority of...
- Introduction
- Spherically symmetric scalar field black holes
- Tidal forces in the center-of-mass frame
- Tidal forces acting on a star orbiting a scalar black hole near its horizon
- Conclusions
Josephson current between two one-dimensional nanowires with proximity induced either s-wave or p-wave pairing and separated by a narrow dielectric barrier is calculated in the presence of Rashba spin-orbit interaction (RSOI), in-plane and normal Zeeman magnetic fields (ZMF). A topological superconducting phase in a Josephson junction of s-wave superconductors (s-JJ) is realized under the...
The common approach for implementation of self-triggered radio detection is applying amplitude threshold at station and cluster levels.
The main difficulty of this approach at most facilities is a high level of background and radio frequency interference.
For the efficient implementation of self-trigger it is needed to filter noise pulses from input data.
In the present work we present the...
The discrete part of the domain wall excitation spectrum, the
profile of which is described by a kink solution with one or
both power-law asymptotics, cannot contain levels other than
the zero (translational) mode. Nevertheless, it can be shown
that scenarios are quite possible when long-lived vibrations
will be excited on the domain wall. This, in turn, can affect
the processes of interaction...
In the case of the pile-up background (background from the neighboring interactions inside the bunch crossing) for Z(νν)γ process, its accurate calculation is very challenging.
If the impact of the pile-up background is negligible, as it is expected in the case of Z(νν)γ process selection, some global uncertainty from this source can be used.
This report studies the pile-up background and...
