Physics of Particles and Nuclei Letters 
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This 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.Characteristics of Coherent Transition Radiation in the Prewave Zone from a Finite-Size Target
AbstractResults of experimental and theoretical investigation of coherent transition radiation from a finite-size target in the prewave zone are presented. The measurements were conducted in sub-terahertz frequency range on the 100-MeV electron beam extracted from LINAC-200 (JINR). A formula for the spectral-angular density of coherent transition radiation is obtained. Results of the simulation of experimental conditions and experimental data are jointly analyzed. Estimation of the bunch length based on experimental data and obtained theoretical model deviates from the expected value. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - April 1, 2024 Category: Physics Source Type: research
Counting Rates in Collisions of Main and Satellite Bunches at NICA
AbstractEstimated counting rate in the collisions of heavy ions in the NICA/MPD are presented for collisions of main bunches (bunch-bunch scattering), satellite bunches (satellite-satellite scattering), and the collision of a main bunch with a satellite bunch (bunch-satellite scattering). The distribution of vertices in the MPD interaction area is presented. The main conclusion is that the contributions of satellite-satellite and satellite-bunch scattering do not exceed two percent of the bunch-bunch scattering. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - April 1, 2024 Category: Physics Source Type: research
Neutron Activation Analysis of Rare Earth Elements (Sc, La, Ce, Nd, Sm, Eu, Tb, Dy, Yb) in the Diagnosis of Ecosystems of Donbass
AbstractUnder conditions of intense anthropogenic impact, the territory of modern Donbass is geochemically contrasting environment. Concentrations of rare earth elements (Sc, La, Ce, Nd, Sm, Eu, Tb, Dy, Yb) in the natural ecosystems of the Northern Azov region (Central Donbass) were determined by indicator plants using neutron activation analysis. An open landscape experiment was carried out using mossCeratodon purpureus (Hedw.) Brid. which has a high information response in the assessment of technogenic impacts. It allowed to establish the levels of regional contamination with rare earth elements, to identify correlation ...
Source: Physics of Particles and Nuclei Letters - April 1, 2024 Category: Physics Source Type: research
Analysis of Libraries of Evaluated Nuclear Data Using the Example of Calculations of Np-237 Sphere Criticality
AbstractA number of fast reactor projects suggest using neptunium nitride (NpN) as a fuel. Given that the neutron-physical characteristics of Np-237 are insufficiently studied, a detailed analysis of the libraries of evaluated nuclear data is necessary for numerical modeling of the reactor operation. The purpose of this study is to compare libraries to reduce the errors in calculating the critical mass of Np-237. The experimental values ofK-eff (found in the experiment conducted at Los Alamos National Laboratory in 2002) are compared with the calculated values obtained using various software packages (MCNP, Serpent) and 14...
Source: Physics of Particles and Nuclei Letters - April 1, 2024 Category: Physics Source Type: research
Method with Digital Signal Processing for Increasing the Efficiency of Thermal Neutron Detection by a Scintillation Detector Based on a $${{^{6}{\text{LiF}}} \mathord{\left/ {\vphantom {{^{6}{\text{LiF}}} {{\text{ZnS}}({\text{Ag}})}}} \right. \kern-0em} {{\text{ZnS}}({\text{Ag}})}}$$ Screen and Wavelength-Shifting Fibers
AbstractThe results of studying neutron signals from scintillation detectors based on a\({{^{6}{\text{LiF}}} \mathord{\left/ {\vphantom {{^{6}{\text{LiF}}} {{\text{ZnS}}({\text{Ag}})}}} \right. \kern-0em} {{\text{ZnS}}({\text{Ag}})}}\) screen and wavelength-shifting fibers are presented. It is shown that the complex shape of the neutron signals arises from a low signal amplitude and fluctuation of photoelectrons in the process of light collection from the scintillator surface using optical fibers. A charge method for neutron detection using digital signal processing is proposed, which allows an appreciable increase in the ...
Source: Physics of Particles and Nuclei Letters - April 1, 2024 Category: Physics Source Type: research
Gamma Decay Hindrance Factors Used in Systematic Configuration Assignments
AbstractA simple empirical relation is proposed to correlate theK-hindrance factor with the number of quasiparticles in the state configuration. The reduced hindrance\({{F}_{\nu }}\) =\({{({{t_{{1/2}}^{\gamma }} \mathord{\left/ {\vphantom {{t_{{1/2}}^{\gamma }} {t_{{1/2}}^{w}}}} \right. \kern-0em} {t_{{1/2}}^{w}}})}^{{1/\nu }}}\) has been empirically modified such that\(\nu \) =\(\Delta K - L - ({{N}_{\pi }} - {{N}_{\nu }})\), instead of\(\nu \) =\(\Delta K - {\kern 1pt} \,L{\kern 1pt} \), where\({{N}_{\nu }}\) and\({{N}_{\pi }}\) are the numbers of neutron and proton quasiparticles in the state configuration. In systemati...
Source: Physics of Particles and Nuclei Letters - April 1, 2024 Category: Physics Source Type: research
Gerstein –Greiner–Zeldovich Effect: Induced Charge Density and Vacuum Energy
AbstractThe Gerstein –Greiner–Zeldovich effect—the spontaneous emission of vacuum positrons under conditions of Coulomb supercriticality—has been studied in detail based on the first principles of quantum electrodynamics within the framework of an essentially nonperturbative approach based on a special combinati on of analytical methods, computer algebra, and numerical calculations. Particular attention is paid to the vacuum energy\({\kern 1pt} {{\mathcal{E}}_{{{\text{VP}}}}}\), considered a function of the parameters of the external Coulomb source: charge\(Z\) and radius\(R\). The specific contribution to\({\kern ...
Source: Physics of Particles and Nuclei Letters - April 1, 2024 Category: Physics Source Type: research
Development of a Scintillation Muon Shield for Low-Background Experiments
AbstractA technique for producing, adjusting, and testing large-area scintillation detectors ( ≥1 m2) for active cosmic muon shielding in low-background experiments is presented. The detectors developed feature a high efficiency (~99.75%) and low light collection inhomogeneity ( ≤25%); they can be used to construct modular systems for active muon shielding with different coverage areas and the interchangeability of modules. The testing method applied makes it possible to significantly reduce the time of checking light collection inhomogeneity of scintillation panels (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - April 1, 2024 Category: Physics Source Type: research
Natural Frequencies and Eigenfunctions of a Composite Rod
Abstract—The problem of finding the natural frequencies and eigenfunctions of the fuel element of a nuclear reactor is considered. A rod with a piecewise constant material density in the longitudinal direction is used as a model. The frequency equation is explicitly derived, and the natural frequencies of the first twelve harmonics are determined numerically and analytically. Analytical expressions for eigenfunctions are obtained, which are in good agreement with calculations made using the Galerkin method and numerical calculations in the ANSYS program. The results will be used to simulate the dynamics of the NEPTUN pul...
Source: Physics of Particles and Nuclei Letters - April 1, 2024 Category: Physics Source Type: research
On the Effect of Focusing of Coherent Diffraction Radiation by a Semi-Parabolic Target
AbstractBeam characteristics of a terahertz/subterahertz radiation obtained by collimation of coherent diffraction radiation (DR) emitted by ultrarelativistic electrons are considered. To achieve the maximum intensity on the beam axis of such radiation, it is proposed to use a semi-parabolic target with a focal length equal to the distance between the target and the collimator aperture. It is shown that for the proposed geometry, the DR distribution on the aperture plane has a maximum along the beam axis, in contrast to the previously used coherent transition radiation mechanism, which is characterized by a “funnel-shape...
Source: Physics of Particles and Nuclei Letters - April 1, 2024 Category: Physics Source Type: research
Prompt Photon Production in Sub-Processes $${qg \to q\gamma }$$ and $${q\gamma \to q\gamma }$$ of Compton Scattering in Proton –Proton Collision at NICA Energies
Abstract—Dependence of the differential cross section of the production of prompt photons with sub-processes of mixed chromo-electrodynamic\({qg \to q\gamma }\) and pure electrodynamic\({q\gamma \to q\gamma }\) Compton scattering on the total energy of colliding protons\({\sqrt s }\), the transverse momentumpT of photons, the cosine of the scattering angle cos( θ), and the rapidity of photonsy is studied. It has been shown that the purely electrodynamic sub-process can contribute up to the order of ten percent of the total cross-section of the production of prompt photons at NICA energies and, consequently, should be ta...
Source: Physics of Particles and Nuclei Letters - April 1, 2024 Category: Physics Source Type: research
Time-of-Flight System for Particle Identification in the NA61/SHINE Experiment in CERN
Abstract —A new time-of-flight (ToF) system of the NA61/SHINE hadron spectrometer at the extracted beam of the Super Hadron Synchrotron in CERN has been developed in 2019 –2022 by the staff of the Laboratory of High-Energy Physics of the Joint Institute for Nuclear Research. The new ToF system is based on Multigap Resistive Plate Chambers (MRPCs) technology. The previous system consisting of scintillation counters was substituted with the new ToF system. This paper presents the overview of the new NA61/SHINE ToF system. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - April 1, 2024 Category: Physics Source Type: research
Method of Experimental Alignment of Detectors in the DPS-NICA Project
This article presents a methodology that allows it to be carried out based on experimental data. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - April 1, 2024 Category: Physics Source Type: research
High-Voltage Supply System for Electron Cooling of the NICA Buster with Ripple Suppression
AbstractThis paper describes the high-voltage power supply for the booster injector еlectron cooling system of the NICA collider. The ripple suppression module provides low voltage ripple and makes it possible to obtain Xe ion cooling times of less than 0.1 s. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - April 1, 2024 Category: Physics Source Type: research
Exploring Stopping Power Models for Efficient Ignition Condition in Inertial Confinement Fusion Driven by Fast Ignition Method
AbstractFast ignition, a pivotal concept in inertial confinement fusion, presents a departure from conventional methods by implementing a two-stage process for fuel compression and ignition. This novel approach minimizes driver requirements and enhances energy efficiency. Among the primary solutions for initiating fast ignition, the utilization of light ion beams, specifically protons, generated through the interaction of high-power lasers with convertor foils, emerges as a prominent strategy. Investigation into the transport of alpha particles produced by the deuterium-tritium fusion reaction plays a vital role in the for...
Source: Physics of Particles and Nuclei Letters - February 1, 2024 Category: Physics Source Type: research
