Physics of Particles and Nuclei Letters Physics of Particles and Nuclei Letters RSS feedThis is an RSS file. You can use it to subscribe to this data in your favourite RSS reader or to display this data on your own website or blog.

Vacuum Integration: UV- and IR-Divergencies
AbstractIn this note we present the important details regarding the massless vacuum integrations which are not outlined in the literature. In particular, it has been shown how the delta-function represents either UV ‑regime or IR-regime. In the case of vacuum integration, we advocate the use of sequential approach to the singular generated functions (distributions). The sequential approach is extremely useful for many practical applications, in particular, in the effective potential method. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - February 1, 2024 Category: Physics Source Type: research

Vector Analyzing Power in Quasi-Elastic Proton-Proton Scattering at an Energy of 500 MeV/nucleon
AbstractThe values of the analyzing power in quasi-elastic proton-proton (pp) scattering are obtained at the Nuclotron Internal Target Station using a polarized deuteron beam at an energy of 500 MeV/nucleon and the polyethylene target. The selection of useful events has been performed using the time and amplitude information from scintillation counters. Asymmetry by protons has been obtained by the subtraction of the carbon background from the data accumulated on polyethylene. The analyzing power values are compared with predictions of SAID partial-wave analysis and the data of other experiments. (Source: Physics of Partic...
Source: Physics of Particles and Nuclei Letters - February 1, 2024 Category: Physics Source Type: research

Coherent Electroproduction of Vector Mesons on Spinless Targets
AbstractIt is shown that the amplitude ratios of vector-meson production by heavy photons on spinless targets can be explicitly expressed in terms of the spin-density-matrix elements (SDMEs) only if the lepton beam is longitudinally polarized. Making use of the amplitude ratios as free fit parameters instead of the SDMEs reduces the number of the real parameters in data description from 23 to 8. The exact formula for\(R = {{\frac{{d{{\sigma }_{{\text{L}}}}}}{{dt}}} \mathord{\left/ {\vphantom {{\frac{{d{{\sigma }_{{\text{L}}}}}}{{dt}}} {\frac{{d{{\sigma }_{{\text{T}}}}}}{{dt}}}}} \right. \kern-0em} {\frac{{d{{\sigma }_{{\te...
Source: Physics of Particles and Nuclei Letters - February 1, 2024 Category: Physics Source Type: research

Invariants for Angular Distributions in the Production of Lepton Pairs
AbstractThe dependence of the angular distribution of lepton pairs in hadronic collisions on the choice of the reference frame is discussed. A geometric description of the transformations of the angular distribution coefficients is presented. The rotational invariants including all coefficients and restrictions on them are considered. The data of the E615 experiment have been processed and a verification of rotational invariants on their basis has been presented. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - February 1, 2024 Category: Physics Source Type: research

Determination of Elemental Composition of Soils Collected near Waste Incineration Plants in Moscow Using Neutron Activation Analysis
AbstractThe incineration of municipal solid waste is an important source of environmental pollution with heavy metals. In present study the elemental composition of soil samples collected near two main waste incinerators in Moscow was determined. The content of 38 elements (Mg, Al, Si, Ca, Ti, V, Mn, Dy, Fe, K, Na, Sc, Cr, Co, Ni, Zn, As, Br, Rb, Sr, Zr, Mo, Sb, Cs, Ba, La, Ce, Nd, Sm, Eu, Tb, Yb, Hf, Ta, W, Au, Th, and U) was determined using neutron activation analysis. To assess the level of soil pollution, the values of the geoaccumulation index, contamination factor and pollution load index were calculated. The contam...
Source: Physics of Particles and Nuclei Letters - February 1, 2024 Category: Physics Source Type: research

Use of Bremsstrahlung of a Linear Electron Accelerator for Processing Large Objects
AbstractThe results of a numerical analysis of the dynamics of electrons in a beam injected into air with an energy of several tens of MeV and focused by the field of an accompanying electromagnetic radiation (EMR) wave at a full stopping distance are presented. The main feature is that the electrons travel the main part of the path in a radial focusing field, which provides beam transport. During the motion of an electron beam, multiple collisions occur between the particles of the beam and air molecules. As a result of these collisions, the radius of the electron beam increases. To determine the increase in the beam radi...
Source: Physics of Particles and Nuclei Letters - February 1, 2024 Category: Physics Source Type: research

System of Cryogenic Physical Targets for the ACCULINNA-2 Facility
AbstractTo carry out the experiments with radioactive beams at the ACCULINNA-2 fragment separator in the Flerov Laboratory of Nuclear Reactions, a complex of cryogenic thin physical targets with isotopes H2, D2, T2,3He, and4He is being created for the gas, liquid, and solid phase (for hydrogen). One of the three types of cryotargets created for nonhazardous gases in any phase at a temperature of 11 –30 K is described. Requirements to the targets are formulated. A variety of available cells are presented, a concept of safe operation with the solid phase of hydrogen is given, and the gas–vacuum test bench for its impleme...
Source: Physics of Particles and Nuclei Letters - February 1, 2024 Category: Physics Source Type: research

Neutrino Mixing Matrix in Terms of Neutrino Mass Matrix and Its Frobenius Covariants
AbstractAn explicit expression is derived for the mixing matrix of Majorana neutrinos in terms of the mass matrix and its Frobenius covariants. Illustrative scenarios are taken as examples where the suggested formula is used to obtain the mixing matrix from the mass matrix. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - February 1, 2024 Category: Physics Source Type: research

Concept of the High-Temperature Superconductor Magnetic System of the New Nuclotron Synchrotron
Abstract—This work is carried out within the Mega-Science project of the new NICA accelerator –collider complex at the Joint Institute for Nuclear Research (JINR) in Dubna. The existing superconducting synchrotron has been operating since 1993 and requires modernization. The New Nuclotron is planned to be built using magnets made of the second-generation high-temperature superconductor (HT S) material produced by Moscow-based S-Innovations. The magnets will be cooled to 30 K with a flow of two-phase neon inside channels of the winding cable, or to 50–65 K with a flow of helium gas, using the next-generation HTS mater...
Source: Physics of Particles and Nuclei Letters - February 1, 2024 Category: Physics Source Type: research

Food Recognition for Smart Restaurants and Self-Service Cafes
AbstractIn recent years, deep learning has been applied to different tasks in the food recognition field. Some promising solutions have been proposed. Due to the complexity of background food, the problem of pattern recognition on a limited dataset is still challenging. Experiments were conducted on a self-collected dataset with canteen trays, containing images of various dishes depending on the day of the week. The main objective of this work is to compare the effectiveness of modern object detection architectures, namely, YOLO_v5, YOLO_v6, YOLO_v7, and YOLO_v5, with a custom classifier. The experimental results showed th...
Source: Physics of Particles and Nuclei Letters - February 1, 2024 Category: Physics Source Type: research

Method for Studying Characteristics of Light Readout Systems in Liquid Argon
Abstract—A method for studying the components of the light detection system of the Liquid Argon Time-Projection Chamber (LArTPC) of the Near Detector of the DUNE experiment (DUNE ND) in liquid argon is presented. As part of the methodology, comparative tests of a full-scale light collection module for a liquid argon time-projection chamber and a shortened module were carried out using a cryogenic stand. The light detection efficiency of the full-scale module observed in the study is ~5% less than that of the shortened module. The full-scale module is shown to be suitable for designing the LArTPC Near Detector for the DUN...
Source: Physics of Particles and Nuclei Letters - February 1, 2024 Category: Physics Source Type: research

Simulation of the Straw Detector in the NA64 Experiment for the Muon Run
AbstractThe NA64 experiment is a fixed-target experiment at the CERN SPS. The experiment looks for new particles such as dark photons, axion-like particles, new light X orZ ' bosons by colliding 100–150 GeV energy electron or muon beams onto an active target. Three types of track detectors are used in the experiment, one of them is the Straw detector. The article presents a simulation of the Straw detectors. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - December 1, 2023 Category: Physics Source Type: research

Field-Free Molecular Alignment by the Optimized Two-Color Laser Fields
AbstractWe have theoretically investigated the molecular alignment by a asymmetric potential created by the superposition of two-color laser fields. The time-dependent Schrodinger equation is solved numerically for different field parameters. We have shown how enhancement or suppression of the molecular alignment can be manipulated by the laser field parameters, such as time between laser pulses, the different intensity of the pulses, etc. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - December 1, 2023 Category: Physics Source Type: research

Skyrme-Like Λ Hyperonic Interactions and Neutron Stars Properties
AbstractAt high densities that are achieved in neutron stars, there may be additional sensitivity to certain properties of the baryonic interaction. In the present work, we consider neutron stars consisting of nucleons, leptons, and Λ-hyperons with Skyrme baryonic force. We calculate different characteristics of neutron stars such as mass, radius and tidal deformability and investigate their dependence on the properties of the interactions. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - December 1, 2023 Category: Physics Source Type: research

Studying the Option to Form Depth Dose Distribution of an Electron Beam Using a 3D-Printed Plastic Bolus
AbstractEffectiveness of the application of a 3D-printed plastic boluses for electron beam therapy is studied. Boluses are custom-made items intended to provide a required depth distribution of the absorbed dose. Limitations of currently used standard boluses are their simple form, fragility, and complex production. The approach proposed eliminates these disadvantages. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - December 1, 2023 Category: Physics Source Type: research