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.

Monte Carlo Study of Λ Polarization at MPD
AbstractThe transverse hyperon polarization is self-analyzed in their weak decays and represents a sensitive tool to explore the dynamics of hadronic reactions and heavy-ion collisions. It was extensively studied in hadronic reactions, where it is directed along the normal to the scattering plane. In heavy-ion collisions this observable is expected to decrease due to randomization of the scattering on different nucleons. At the same time, there exist another observable, global hyperon polarization, which is directed along the normal to the reaction plane. It is emerging due to the presence of initial angular momentum in no...
Source: Physics of Particles and Nuclei Letters - July 1, 2021 Category: Physics Source Type: research

Space-Charge Waves in the Electron Beam of the Electron Cooling System of the NICA Booster
This study is devoted to experimentally investigating changes in the amplitude of the sum signal at pickup stations, which can be associated with the formation of space-charge waves arising along the electron beam. Space-charge waves are excited by applying an alternating voltage to the near-cathode (control) electrode. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - July 1, 2021 Category: Physics Source Type: research

Higher Order Structural Relativistic Effects for s-States of Hydrogen-Like Systems
AbstractA calculation of structural relativistic corrections of higher orders for the ground states of hydrogen-like systems, such as a hydrogen atom and a muonic hydrogen atom, has been performed. The dependence of the corrections on the parametrization of proton form factors is investigated. The numerical estimates show that the corrections are within the limits of sensitivity of modern experiments to measure the energy characteristics of hydrogen-like systems. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - July 1, 2021 Category: Physics Source Type: research

Implementing Methods for Calculating the Functional Connectivity of Regions of the Human Brain at Rest and Neuroimaging Using Data of Functional Nuclear Magnetic Resonance Imaging (fMRI)
AbstractThis paper describes the concept and basic principles of methods for determining the regions of functional neuronal connectivity of the human brain which formed the basis of the Neuroimaging system at the National Research Center “Kurchatov Institute” for processing and analyzing experimental MRI/fMRI data. A method of functional segmentation (MFS) module of the system is presented for remotely launching tasks of identifying functionally homogeneous regions of the human brain at rest by using a unique MFS method that pro vides clustering using Pearson’s correlation coefficient. Tests of the module on real fMR...
Source: Physics of Particles and Nuclei Letters - July 1, 2021 Category: Physics Source Type: research

Reconstruction of Spontaneous Fission Neutron Multiplicity Distribution Spectra by the Statistical Regularization Method
AbstractIn this paper we propose a technique for reconstructing the multiplicity distribution of spontaneous fission neutrons using the Tikhonov regularization method. The results obtained for252No,244Fm,246Fm, and248Cm are compared with previously reconstructed distributions. The multiplicity distributions of spontaneous fission neutrons of250No,256Rf, and254Rf are reconstructed for the first time. The mean number of neutrons per decay and the dispersion of the distribution are obtained for each spectrum. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - July 1, 2021 Category: Physics Source Type: research

The Production of Gauge Bosons Pairs $${{W}^{ + }}{{W}^{ - }}$$ Associated with 0, 1, and 2 Jets in Proton –Proton Collisions at LHC
We report in this work the production of\({{W}^{ + }}{{W}^{ - }}\) pairs gauge bosons associated with 0, 1 and 2 jets in proton –proton collisions at LHC with an energy of 14 TeV in the center of mass. These processes are produced at leading-order (LO) and next-to-leading-order (NLO) with QCD corrections in the standard model, using MadGraph\(\_\)aMC@NLO. For a realistic description of the processes, we match the hard scattering processes with Pythia8 parton showering and hadronization. The obtained events are run through the fast detector simulation, Delphes, which serves to accurately model the ATLAS and CMS detectors ...
Source: Physics of Particles and Nuclei Letters - July 1, 2021 Category: Physics Source Type: research

Analysis of the Features of the Network Traffic in the Trunk Channel: Zero Channel
In this study, we discuss the problem of a peak arising in the low-intensity region during the aggregation of network traffic measurements. Taking into account the location of the peak in question, we called it the “zero channel” (ZC) (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - July 1, 2021 Category: Physics Source Type: research

Investigation of $$B_{c}^{ + } \to D_{s}^{ + }\mathop {\bar {D}}\nolimits^0 $$ and $$D_{s}^{ + }{{D}^{0}}$$ Decays Including Factorization Approaches and Final State Interaction Effects
In this study there are nineteen intermediate states for\(B_{c}^{ + } \to D_{s}^{ + }{{\bar {D}}^{0}}\) decay and four middle states for\(B_{c}^{ + } \to D_{s}^{ + }{{D}^{0}}\) decay in which the contribution of each one is calculated and summed in the final amplitudes. By choosing the value of the\(\eta \) according to the mass of the exchange meson, as\(\eta = 3\) for exchange meson of\(D{\text{*}}\) (or\(D\)) and\({{{{f}_{c}}} \mathord{\left/ {\vphantom {{{{f}_{c}}} {{{f}_{u}}}}} \right. \kern-0em} {{{f}_{u}}}} = 1.2\% \) the obtained results in FSI are (in units of\({{10}^{{ - 6}}}\))\(\frac{{{{f}_{c}}}}{{{{f}_{u}}}}\m...
Source: Physics of Particles and Nuclei Letters - July 1, 2021 Category: Physics Source Type: research

Organ Dose Estimation for Adult Chest CT Examination Using GATE Monte Carlo Simulation
Abstract —This work relates to the study of organ dose during a Chest computed tomography (CT). Organ dose has been simulated with the Monte Carlo Simulation code (GEANT4/GATE) using two computational phantoms Adam male and Eva female. Simulated scans were performed for helical mode, collimation of 10  mm and tube voltages of 80, 110 and 130 kV. The method “dose by region” used in GATE to calculate the organ doses was validated with maximal agreement of 7%. Organ doses for Adam and Eva were evaluated and contributions to effective dose were compared to those obtained from IMPACT CT and CT-EX PO. It was found that Ev...
Source: Physics of Particles and Nuclei Letters - July 1, 2021 Category: Physics Source Type: research

Comparative Study of Spontaneous-Fission Characteristics of 252No and 254No Isotopes
AbstractSpontaneous fissions of the252No and254No nobelium isotopes have been studied in a series of experiments with the SHELS separator. These isotopes are produced by colliding a beam of48Ca ions from the U-400 cyclotron with the206Pb and208Pb targets. The measured characteristics of the252No and254No spontaneous fissions include their half-lives, total kinetic energies of fission fragments, and prompt-neutron multiplicities. The average number of neutrons per254No spontaneous-fission act is measured for the first time as 4.88 ± 0.53. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - July 1, 2021 Category: Physics Source Type: research

Cord (Closed Orbit Dynamics): A New Field Map Evaluation Tool for Cyclotron Particle Dynamics
AbstractIn this paper, we present the main components of CORD (Closed ORbit Dynamics) code used in the conceptual design of the SC230 cyclotron. SC230 is a compact superconducting isochronous cyclotron for proton therapy, that has been recently proposed in JINR. Obtaining maximum amount of information from field maps without the need to perform time-consuming beam tracking is useful for magnet and accelerating system design. CORD code is providing particle dynamics analysis based on a combination of magnetic field map analysis with electric field map analysis. The first part of the article is about the proposed method for ...
Source: Physics of Particles and Nuclei Letters - July 1, 2021 Category: Physics Source Type: research

The New 249No Isotope
AbstractIn the reaction of complete fusion of48Ca-ions with a204Pb target, a new α line, related to the decay of a new, previously unknown isotope (249No), has been detected in an experiment carried out at the SHELS separator. The α decay energy (Eα = 9129 keV) and the half-life (T1/2 = 38.1 ± 2.5 ms) are measured using the GABRIELA detector array. The SF branching ratio was estimated (bSF≤ 0.2%). (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - July 1, 2021 Category: Physics Source Type: research

Monitoring System for Selection π−-Meson Stops
AbstractA description of a monitoring system consisting of semiconductor detectors designed to detect π− mesons stops in various targets is presented. It is shown that setting thresholds for energy release in monitors and using a silicon detector as an active target makes it possible to achieve an accuracy of 5 and 6.5% in determining the number of pion stops, respectively, for active and conventional targets. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - July 1, 2021 Category: Physics Source Type: research

Reducing the Level of Power Vibrations in the NEPTUNE Pulsed Reactor
AbstractDubna ’s IBR-2 periodic pulsed research reactors are the most effective source of slow neutrons in extracted beams for studying various structures by using diffraction, small-angle scattering, reflectometry, inelastic scattering, and neutronography, thanks to their short-pulse neutrons and high average flux (reaching 1014 cm–2 s–1). At the same time, due to the specificity of the kinetics, fluctuations in the power energy of pulses in such a reactor are tens of times higher than in stationary reactors and create problems when trying to control the apparatus. This paper proposes and substantiates a method to s...
Source: Physics of Particles and Nuclei Letters - May 1, 2021 Category: Physics Source Type: research

Assessment of TiO2 Nanoparticles Accumulation in Organs and Their Effect on Cognitive Abilities of Mice
AbstractBecause of good optical and electrical properties, TiO2 nanoparticles are widely used in many fields of industry and medicine. To assess the effect of TiO2 nanoparticles on mice cognitive abilities and their accumulation in different organs, daily, up to 2-month period, experimental mice were administrated with TiO2 nanoparticles solution. Accumulation of titanium in blood, brain, liver, kidney, lungs and feces was assessed by neutron activation analysis. Cognitive abilities in mice before and after TiO2 nanoparticles administration were evaluated in the Morris water maze behavioral test. The amount of titanium in ...
Source: Physics of Particles and Nuclei Letters - May 1, 2021 Category: Physics Source Type: research