Cosmic rays are highly energetic particles emitted from different galactic and extragalactic sources.These primary particles propagate through interstellar space until they reach the Earth's atmosphere. The number of particles detected on the surface of Earth is not the same depending on the direction viewed in the sky, it varies with the zenith angle. In this work, we calculate the angular...
Astrophysical radio experiments in Antarctica and Greenland are designed to search for neutrinos with ultra high energies. The method of their detection is based on the search for Askaryan radio pulses emitted by showers from the interaction of neutrinos in ice. For these experiments, it is important to know what pulsed radio noise may be present in order to distinguish them from rare neutrino...
The upcoming LHCb calorimetry upgrade, aimed to allow LHCb detectors to operate with higher luminosity, implies significant hardware modifications to the present ECAL. These changes include replacement of the current shashlik-type modules with spaghetti-type for the inner part, upgrade of the shashlik modules to improve time resolution and possible removal/modification of the HCAL (Hadron...
The PAMELA electromagnetic calorimeter consists of 44 single-sided silicon sensor planes interleaved with 22 plates of tungsten absorber. It provides a comprehensive information about spatial development of hadronic showers, and about deposited energy amount.
In this work, Monte Carlo simulations (based on Geant4) performed using different available models, including Fritiof (FTF) and Quark...
The angular distributions for the 11.28 (7/2+), 11.82 (9/2-), and 13.79 (7/2-) MeV states were obtained and analyzed from the scattering of light particles by the 9Be nucleus.[1,2]. The MDM method was used to estimate the radii [3]. The resulting diffraction radius of the 11.82 MeV state turned out to be equal to the radius of the ground state. This indicates that the root-mean-square radius...
The current level of development of experimental facilities makes it possible to conduct studies of both relatively long-lived nuclei forming the valley of stability and exotic nuclei lying outside this region. The production of exotic nuclei is a rather difficult task, one of the solutions of which was the using radioactive isotopes beams accelerated to energies above the Coulomb interaction...
One of the most actual questions of particle physics and cosmology today is the nature of Dark Matter. Experiments on the direct search for dark matter particles are aimed to direct detection of Weakly Interaction Massive Particles (WIMP) or obtaining constraints on their space of mass parameters and spin-independent interaction cross sections.
For WIMPs (from a few GeV/c$^2$ to TeV/c$^2$)...
Neutrinoless double beta decay search is one of the most significant tasks in nuclear and elementary particle physics. The detection of this process will provide information on such fundamental issues as the absolute neutrino mass scale, the type of neutrino hierarchy (normal or inverse), and violation of CP parity in the lepton sector. One of the supposed options is a process involving the...
The study of the thermonuclear reaction rates of neutrino production in the primordial hot region is essential for understanding primordial nucleosynthesis in regions formed by primordial density inhomogeneities. We considered the thermonuclear reaction rates due to effects of electron-positron annihilation, reactions of weak proton-neutron transitions, and the production of light nuclides...
The aim of the present work was to measure the yield ratios of the 85m,gSr produced in the natSr(γ,xn) reactions with bremsstrahlung end-point energy 55 MeV. The study examined the possibility of producing 85Sr isotope in photonuclear reactions on a natural mixture of strontium isotopes. The radionuclide 85Sr has decay parameters such as half-life and photon energies suitable for the nuclear...
We obtain kink solutions for a family of field-theoretic models with polynomial self-interaction of a real scalar field. These solutions have power-law asymptotics, and hence can be used for modelling of the so-called thick domain walls (among other applications). We also study various properties of the obtained solutions.
At the Baksan Neutrino Observatory deployed in the North Caucasus mountains, it is proposed to develop, at a depth corresponding to about 4700 mwe, a large-volume neutrino detector based on a liquid scintillator with a target mass of 10 kt. The main physics goals of the detector are low-energy neutrino physics, astrophysics and geophysics. The highest possible light yield is crucial for such...
In addition to classical analytical data processing methods, machine learning methods are widely used for data analysis in elementary particle physics. Most often such techniques are used to identify a particular class of events (the classification problem) or to predict a certain event parameter (the regression problem). Here we present the result of using a machine learning model to solve...
The electroweak production of $Z(\nu\bar{\nu})\gamma$ in association with two jets is studied in a regime with a photon of high transverse momentum above 150 GeV using proton--proton collisions at centre-of-mass energy of 13 TeV at the Large Hadron Collider. The analysis uses a data sample with an integrated luminosity of 139 fb$^{-1}$ collected by the ATLAS detector during the 2015--2018 LHC...
An excess of positrons in cosmic rays (CR) called positron anomaly was discovered more than decade ago and still stays an open-ended question in astrophysics. There is a big group of models involving annihilating or decaying Dark Matter (DM) purported to explain the anomaly. But they face an obstacle in the form of gamma-rays. Simple DM models tend to overproduce gamma-rays, leading to...
Models of the origin of astrophysical neutrinos with energies from TeVs to PeVs are strongly
constrained by multimessenger observations and population studies. Recent results point to statis-
tically significant associations between these neutrinos and active galactic nuclei (AGN) selected
by their radio flux observed with very-long-baseline interferometry (VLBI). This suggests that...
To improve the sensitivity to CP violation, reduce systematic uncertainties, T2K launched an intensive upgrade program that includes the upgrade of the near neutrino detector ND280. A novel 3D highly granular scintillator detector, called SuperFGD, of a mass of about 2 tons will have the full polar angle coverage for charged particles produced in neutrino interaction, a low threshold...
The Noble Element Simulation Technique (NEST) is a C++ package with optional GEANT4 integration and a Python equivalent (nestpy) developed for liquid noble gases experiments. It is capable of accurate predictions of scintillation and ionization signal from different particles for a large range of drift fields in liquid xenon and argon and is widely used by leading dark matter and neutrino...
We obtain estimates for the kink-antikink force of interaction. We consider the case of kinks with power-law asymptotics, which is used, in particular, to model thick domain walls. We use a method based on a special type of field approximation between a kink and an antikink.
The BM@N (Baryonic Matter at Nuclotron) is the first running experiment at the NICA accelerator complex and is aimed at studying the QCD diagram at high baryon densities. The forward detectors of the BM@N experiment are the forward hadron calorimeter, scintillation wall and quartz hodoscope. The forward detectors are used to determine the centrality and orientation of the reaction plane, and...
The DarkSide-20k (DS-20k) experiment seeks to directly detect dark matter in the form of weakly interacting massive particles (WIMPs). DS-20k is a two-phase liquid argon (LAr) Time Projection Chamber (TPC) with an active volume of 50 tonnes, which is built in the Outer Veto. The Outer Veto is approximately 650 tonnes of atmospheric argon (AAr) in a membrane cryostat, designed to veto...
At present, production, properties, and decays of heavy baryons are intensively studied both experimentally and theoretically. The $SU(3)$ flavor symmetry allows an existence of a large number of hidden charm pentaquark states which differ in their light quark content. Here, ratios of weak decay width of bottom baryons into a pentaquark and light meson are presented. The most interesting for...
The method of induced activity was used to study photonuclear reactions on a natural mixture of selenium isotopes. This study measured the yields of the radionuclides 73(m+g)Se, 75Se, 79mSe, 81(m+g)Se, 71As, 72As, 74As, 76As, 77As, 78As, and 79As produced in natSe(γ, xnyp) multiparticle reactions with bremsstrahlung end-point energy of 55 MeV. The bremsstrahlung radiation was generated using...
Project of a compact muon hodoscope for muonography of various objects.
Tselinenko M. Yu.1, Kompaniets K. G1, Pasiuk N. A.1, Shutenko V.V.1, Yashin I. I.1
1NRNU MEPhI, Russia, Moscow, MYTselinenko@mephi.ru
Report Type: Poster.
At present, the method of muonography (by analogy with X-ray diffraction radiography) of the internal structure of various natural and artificial objects using the...
Rare decay process of the Higgs boson into a pair of $J/\Psi$ and a pair of $\Upsilon$ mesons is studied within perturbative Standard Model and relativistic quark model. Relativistic corrections to the production amplitudes, connected with the relative motion of heavy quarks, are calculated. Different decay mechanisms are studied. Numerical values of the decay widths of the Higgs boson are...
The Jacobson have shown that Gravity force is not fundamental phenomenon and one able to consider it as emergent one. According to his idea, gravity is only the first law of thermodynamics of space-time. The next step in this direction was forwarded by Verlinde whom argued that gravity is not fundamental force and can be interpreted as the entropic force due to changing of entropy associated...
Liquid scintillators have always been an important part of many experiments in neutrino physics. Currently, the so called “standard” liquid scintillator consisting of linear alkylbenzene (LAB), 2,5-diphenyloxazole (PPO) and 1,4-Bis(2-methylstyryl)benzene (bis -MSB) is used in many experiments. As an alternative to the “standard” LAB-based liquid scintillator, a new highly efficient liquid...
A central goal of current relativistic heavy-ion experiments is to study the properties of the hot and dense QCD matter. Anisotropic flow measurements of identified particles play an essential role in the constraining transport coefficients of the strongly-coupled Quark Gluon Plasma (sQGP) and studies providing better insight to the QGP phase diagramm.
We report on the results of the recent...
Level structure of heavy helium isotope $^{9,10}$He is studied in the reactions of stopped pion absorption $^{14}$C($\pi^-$, p$^4$Нe )X, $^{14}$C($\pi^-$,d$^3$Нe)X, $^{14}$C($\pi^-$,p$^3$Нe)X. The experiment was carried out at the LANL with a two-arm semiconductor spectrometer. The ground and excited states of $^9$He have been observed. The E$_x \approx$ 11 MeV state of $^9$He has been...
A promising way of studying properties of distant objects and transient sources in the Universe is exploring neutrino coming from that sources. Such transients as Fast Radio Bursts (FRB) are of particular interest for astroparticle physics. FRB is a millisecond radio transient observed at extragalactic or cosmological distance. Numerous models with a wide variety of physical processes have...
The paper presents the methodology and analysis of experimental data obtained by a Large Volume Detector (LVD) located in the Gran Sasso Laboratory. For 30 years of the experiment, a large database has been collected, on the basis of which a limit has been set on the frequency of supernova explosions in the Galaxy.
A gaseous beam monitor is being developed for the CSR external-target experiment (CEE) at HIRFL. The requirements on the beam particle rate of up to $10^{6}$ pps and the per-particle position resolution of better than 50 $\mu$m pose challenge on the detector design. The beam monitor mainly consists of two drift chambers, each measuring a 1D position of the beam particle transverse to the beam...
The LHC Phase II Upgrade foreseen for 2026 implies multi fold increasing of number of collisions and radiation levels compared to the present LHC conditions. The electromagnetic calorimeter (ECAL) of LHCb experiment requires modernisation due to enlarged radiation doses and high occupancy: replacing shashlik-type modules for the central part by spaghetti-type (SPACAL) calorimeter. Current...
In the early stages of the core-collapse supernova a prominent amount of neutrinos is emitted in a short burst on a ~10s time scale.
Since the neutrinos can escape the medium of the collapsing star without interaction, such signal can be detected by the neutrino experiments several hours before the observable optical signals.
SuperNova Early Warning System (SNEWS) is an international network...
The study of the proton transfer process during the interaction of accelerated nuclei with light nuclei near the Coulomb barrier is of great interest for astrophysics, since the information obtained from the analysis of such reactions makes it possible to estimate the astrophysical S-factors of the radiative capture of protons at very low energies, where direct measurements are impossible.
For...
The iDREAM (industrial Detector of Reactor Antineutrinos for Monitoring) has been developed as a prototype of the industrial detector for development reactor monitoring methods. The detector has been installed and commissioned at Kalinin NPP (Russia) at 20 m from the 3 GWth reactor core (third unit). The detector is a scintillator spectrometer. The calibration measurements play a crucial role...
The d+d reaction is very well suited for calibration due to the 2.45 MeV fast neutron reaction channel. Due to this circumstance, the d+d neutron generator is considered as one of the promising tools for calibrating low-background neutrino and dark matter detectors [1]. The current status of the development of a compact neutron generator is presented. The generator includes the elements of the...
We consider the interaction of particles with domain walls in the early Universe. The domain wall is a topological soliton of a scalar field. We obtain quantitative estimates for transmission and reflection coefficients using various approximate expressions for the effective potential of interaction.
The background induced by misidentification of a jet as a photon ($jet\rightarrow\gamma$) is usually estimated using two-dimensional sideband method (ABCD-method) in collider experiments. This report is devoted to an alternative "slice method" of the estimation based on likelihood fit of $jet\rightarrow\gamma$, signal and other background yields using kinematic distributions in a phase-space...
The problem of dark matter particle search is at the frontier of the modern physics. The scenario of composite dark matter, in which hypothetical, stable, lepton-like particles X having a charge - 2n, where n is any natural number, and forming neutral atom-like states of X-helium with primary helium nuclei, called "dark" atoms, offer a solution to the problem of direct searches for dark matter...
The spatial parity (P) violation in strong interactions have never been observed experimentally. One can include a P-breaking term in the QCD lagrangian. Thus, there can be a local violation of P-symmetry in the medium with hight temperature and large topological fluctuations [1]. As a consequence, some hadrons would decay in channels that forbidden by the global parity conservation [2]. In...
The binary black hole coalescences GW150914 and GW151226 observed by the LIGO enabled us to investigate gravity in the strong-field regime. In the formation models, including isolated binary stars, there are still many open questions about the sustainability of mass transfer and common envelope evolution. The gravitational wave (GW) sources have been predicted using extensive binary population...
The aim of the poster is to demonstrate status of the work in estimation of NA62 [1] experiment sensitivity towards the search for forbidden decay $\pi^{0}\rightarrow3\gamma$ and rare decay $\pi^{0}\rightarrow4\gamma$. Current branching-ratio upper limit is $3.1\times10^{-8}\:(90\%\;\textrm{C.L.})$ for the $\pi^{0}\rightarrow3\gamma$ decay and $2\times10^{-8}\:(90\%\;\textrm{C.L.})$ for...
The report focuses on studying the semiclassical limit in the case of a closed isotropic model with a scalar field, decomposed into modes. The calculations are made within frameworks of two approaches. The first is the Wheeler-DeWitt quantum geometrodynamics, and the second is the extended phase space approach, that is known to be gauge dependent. The work is aimed in comparing results,...
Ultra-high energy cosmic rays (UHECR) can be produced in active galaxies, and directional correlations between them were studied extensively. One puzzling result was the correlations of arrival directions of UHECR and a particular class of active galactic nuclei, BL Lacertae type objects, discovered in 2004 with the HiRes stereo data set [1,2]. If confirmed, this result would definitely mean...
This report discusses one of the stages of work on the creation of artificial pinning centers in superconducting tapes, for the possible creation of a series of superconducting magnets based on them, operating at temperatures up to 65 K.
The report describes the experimental setup and the results of irradiation of the HTS samples in the neutron-proton field of the lead converter, analyzes the...
The behavior of a beam with elliptical cross-section and arbitrary partial emittances in a solenoid is studied analytically. Such analysis is needed for various tasks of accelerator physics, for example, the formation of the beam extracted from the ion source and for the Low Energy Beam Transport (LEBT) design. The peculiarities of the coupling of the beam oscillations in longitudinal magnetic...
I.N. Borzov 1,2, S.V. Tolokonnikov1,3, S.S. Pankratov 1, A.V. Khudov4
1 National Research Centre “Kurchatov Institute”, Moscow, Russia.
2Bogolubov Laboratory of Theoretical Physics, Joint Institute of Nuclear Research, Dubna, Russia.
3 Moscow Institute of Physics and Technology (National Research University), Dolgoprudny, Russia.
4 National Research Nuclear University MEPHI, Moscow,...
Polarizability is a fundamental particle property. Measurement of pion
polarizability values allows checking strict ChPT prediction. Charged and
neutral pi-mesons polarizability will be extracted from the CPP and NPP
experimental data using Primakoff pair production cross-section on nuclear target. The CPP/NPP experiment run at TJNAF Hall-D was conducted in the summer of 2022 and utilized a...
Inclusion in Analysis of Borexino data K-40 antineutrino spectrum makes the fit better than without. Borexino data can install an upper limit on potassium abundance < 3% of Earth's mass. The probability to observe high K-40 counting rate in case of its absence is about 0.0001. It signals on large potassium abundance in the Earth.
The results of the study of the specific light output from the energy of X-rays and gamma quanta in the range from 1.5 to 662 keV for scintillation crystals NaI (Tl), CsI (Na), CsI (Tl), Bi4Ge3O12, CdWO4, ZnWO4, Y3Al5O12: Ce, CaF2 (Eu), LSO, YAlO3: Ce. The obtained dependences have a nonlinear form with pronounced minima in the region of the K and L edges of the absorption of the elements that...
A method for finding the position of the sectors of the time projection chamber based on experimental data is proposed. Based on the results of modeling the response of the sensitive elements of the camera, three types of tracks were reconstructed: cosmic muons, beams of the laser detector system and muons from the interaction of nuclei. Using these artificial experiment data and the proposed...
Dark Matter particles that are constructed from proton-antiproton String Junctions (SJ,antiSJ) was already announced at ICPPA18. Essencial specifics in spectra of baryons in p-p interaction are leading to new implications for cosmic ray physics and astrophysics. VHE event in stratosphere has shown that the pattern of astroparticle collision differs from nucleus-nucleus interaction. It can be...
We study a $D$-dimensional Einstein-Gauss-Bonnet model which includes the Gauss-Bonnet term, the cosmological term $\Lambda$ and two non-zero constants: $\alpha_1$ and $\alpha_2$. Under imposing the metric to be diagonal one, we find cosmological type solutions with exponential dependence of three scale factors in a variable $u$, governed by three non-coinciding Hubble-like...
To study the conditions of thermal equilibrium of relativistic electron beam (REB) is important for numerous fundamental and applied tasks of accelerator physics and space physics as well as physical electronics. In our report the analytical study of the dynamics of neutralized relativistic electron beam is presented. The beam parameters are found which correspond to equilibrium propagation of...
The article considers geo-effective phenomena that arose in near-Earth outer space and on Earth during 23 and 24 cycles of solar activity. The results of the SWPC NOAA data processing showed that about 90% of proton events with an energy of $p_T > 100$ MeV and 100% of terrestrial increases (GLE) are associated with solar flares with a capacity of more than M5.0. Methods of operational...
The spectroscopy of higher lying charmonium states together with exotic mesons with masses above the $2\,m(D)$ open charm threshold has been full of surprises and remains poorly understood [1]. It is a good testing tool for the theories of strong interactions, including: QCD in both the perturbative and non-perturbative regimes, LQCD, potential models and phenomenological models. The...
The characteristics of detectors made of silicon carbide (SiС) irradiated with various integral fluxes of both Xe ions with an energy of 165 MeV and fast neutrons were studied. With the help of alpha-particles, it was found that the energy resolution of SiC detectors irradiated with the maximum fluxes of heavy ions ($F_{max} = 2.3\times10^9$ ion/cm$^2$) and neutrons ($F_{max} =...
Placement of the hydroacoustic antenna-detector for ultrahigh energy neutrino
directly below the underwater acoustic channel gives several important advantages.
They simplifies the creation of the phased hydroacoustic array and signal processing for registration of such neutrinos. High temperature of the Mediterranean in comparison with other seas improves detector sensitivity. Placement of...
Double electron-capture (EC/EC) of $^{58}$Ni on excited states of $^{58}$Fe is investigated at Baksan neutrino observatory INR RAS in DULB-4900 laboratory (4900 m w. e.) using the ultralow-background HPGe detector with a sensitive volume of 200 cm$^3$ ($\sim1$ kg mass) and a natural nickel sample of $\sim68$% $^{58}$Ni with a mass of $\sim 6$ kg. The detector is surrounded by low-background...
When the temperature of the pyroelectric single crystal changes, X-ray generation is possible. To obtain the above effect, it is necessary to change the temperature of the crystal in vacuum (pressure on the order of several mTorr). Under such conditions, an electric field arises between the grounded target and the crystal surface, which causes the field emission of electrons from the crystal...
In recent decades, Cherenkov water (ice) telescopes such as IceCube, Baikal-GVD and KM3Net have been 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...
A.T. D’yachenko$^{1,2}$, M.S. Abu-Khasan$^{2}$
$^{1}$ National Research Center “Kurchatov Institute” B.P. Konstantinov Petersburg Nuclear Physics Institute, Gatchina, Russia:
$^{2}$ Emperor Alexander I Petersburg State Transport University, St. Petersburg, Russia
Within the framework of our approach, we have found an analytical solution of the equations of hydrodynamics in the soliton...
We study deuteron- proton elastic scattering in the GeV energy range.
Nowadays, a significant amount of the experimental data at these energies
has been accumulated both with unpolarized and polarized beams. However,
a theoretical description of the data faces problems because of
well developed Faddeev calculation technique cannot be applied at these energies.
In this report we...
Scientific project GAMMA-400 relates to the new generation of space observatories intended to perform a search for signatures of dark matter in the cosmic gamma emission, measurements of characteristics of diffuse gamma-ray emission and gamma-rays from the Sun during periods of solar activity, gamma-ray bursts, extended and point gamma-ray sources, electron/positron and cosmic-ray nuclei...
We study the one-parameter generalizations of the Starobinsky model of inflation, which obey all observational constraints on the inflationary parameters. Our models are connected to the original Starobinsky model via continuously changing an additional parameter. Modifying the Starobinsky $R+R^2$ inflationary model by adding an $R^{3/2}$-term, we find that the tensor-to-scalar ratio...
Axion is a hypothetical pseudoscalar Nambu-Goldstone boson that was introduced as an extension to the Standard Model intended to solve the strong CP problem.
It also could be a possible solution for a series of other fundamental physics problems such as the the dark matter or photon ultratransparency of the Universe.
As the least model-dependent axion interaction is its interaction with a...
The multipomeron exchange model was considered earlier in papers [1 – 5]. Within the framework of this model, it was possible to successfully describe the charged multiplicity (Nch), mean transverse momentum (pt) and pt-Nch correlations in pp and pp¯ collisions over a wide energy range (from ISR to LHC). It allowed also to reproduce the growth of the yields of strange, multi-strange and charm...
Phase structure of dense quark matter with chiral and isospin imbalance is considered in the framework of effective models. There has been considered as two color as well as three color QCD. It was shown that chiral imbalance has several rather peculiar properties such as being universal catalyzer,
i. e. it catalyzes all the considered symmetry breaking patterns in the system, including the...
Particle identification at the Super Charm-Tau factory experiment will be provided by a Focusing multilayer Aerogel
ring imaging Cherenkov detector FARICH. Due to hardware constraints the detector captures a great amount of noise
which must be mitigated to reduce both a data flow and further storage space.
In this presentation we present our approach to filtering signal hits. The approach is...
