Physics of Particles and Nuclei Letters 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.

The Elemental and Texture Analysis of the Chelyabinsk Meteorite Fragment by Non-Destructive Neutron Methods
AbstractIn the study of the Chelyabinsk meteorite fragment various non-destructive neutron methods, such as prompt gamma-ray activation analysis and neutron diffraction texture analysis were used. These methods are realized by the special spectrometers which are operating at the neutron beams of the IBR-2 pulsed reactor (Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Dubna, Russia). Applying prompt gamma-ray activation analysis, mass fractions of 15 elements: Na, Mg, Al, Si, S, Cl, K, Ca, Sc, Ti, Cr, Mn, Fe, Co, and Ni were determined. The fragment surface was analyzed by the X-ray fluorescence....
Source: Physics of Particles and Nuclei Letters - April 1, 2022 Category: Physics Source Type: research

Production of Ultracold Neutrons in an Escaping Decelerating Trap
Abstract —Ultracold neutrons (UCNs) are widely used in the physics of elementary particles and fundamental interactions, and they can potentially be used in neutron scattering. However, most of these studies are limited by the available UCN densities and fluxes. One way to increase them is to use peak fluxes in pulsed neutron sources that are orders of magnitude higher than average. In the present work, a concept of UCN sources is proposed that makes it possible to implement this idea. We propose producing very cold neutrons (VCNs) in converters located in neutron sources and extracting and slowing them down to UCN energ...
Source: Physics of Particles and Nuclei Letters - April 1, 2022 Category: Physics Source Type: research

Retraction Note to: Study of Mass Spectra and Decay Properties of D Meson in a Relativistic Independent Quark Model
This article has been retracted. Please see the Retraction Notice for more detail: https://doi.org/10.1134/S1547477122020133 (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - April 1, 2022 Category: Physics Source Type: research

Prediction of Radiation Environment around NICA Complex
AbstractThe most important condition for starting work at the NICA accelerator complex, which is a powerful source of ionizing radiation, is to obtain a sanitary-epidemiological conclusion with the justification of a sanitary-protection zone around the facility. The size and configuration of the sanitary-protective zone around the NICA complex are determined by the mode of operation and the loss of particles in its various elements. Based on the calculations of the radiation situation performed earlier, the boundaries of the sanitary-protective zones have been defined for the heavy ions collision mode of the collider opera...
Source: Physics of Particles and Nuclei Letters - April 1, 2022 Category: Physics Source Type: research

Solenoid Separator of Superheavy Elements: A New Design for the GASSOL Separator
AbstractThe concept of a superconducting solenoid separator of super-heavy elements (SHEs) obtained in nuclear fusion reactions is presented. To obtain small dimensions of the SHE beams in the focal plane, a new design of the GASSOL gas-filled separator is proposed in which a large longitudinal axially symmetric magnetic field is used. For the SHE nuclei, this separator will provide the required speed and high efficiency required for working with isotopes of 112 –117 elements. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - April 1, 2022 Category: Physics Source Type: research

Theoretical Study of the Role of Symmetry Energy as Well as Its Density Slope and Curvature on Neutron Star Core Crust Transition Density Using Finite Range Effective Interaction
AbstractThe core crust transition density\({{\rho }_{{\text{t}}}}\) and core crust transition pressure\({{P}_{{\text{t}}}}\) of neutron stars are analyzed with the thermodynamical approach using finite range effective interaction for two different splittings of exchange strength parameters. The role of density derivatives of symmetry energy on\({{\rho }_{{\text{t}}}}\) and\({{P}_{{\text{t}}}}\) are studied and it is found that reducing the effect of slope, the curvature of symmetry energy dominates the variation of transition density. The results are compared with various models quoted in the literature. (Source: Physics o...
Source: Physics of Particles and Nuclei Letters - April 1, 2022 Category: Physics Source Type: research

Impact of the Background of Delayed Neutrons on the Capabilities of Experimental Facilities Based on Pulsed Reactivity-Modulated Neutron Sources
AbstractThe neutron-beam pulse structure (0.3-ms-long power pulses repeated with a period of 200 ms) at the IBR-2 research reactor (operated by Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research (JINR), Dubna) is obtained by modulating reactor core reactivity. However, the neutron flux between power pulses does not fall to zero; due to the continuous emission of delayed neutrons from the fissile material of the reactor core, it remains at a quasi-constant level, which is approximately 10–4 of the maximum neutron flux in the reactor power pulse. Based on this observation it is generally believed tha...
Source: Physics of Particles and Nuclei Letters - April 1, 2022 Category: Physics Source Type: research

Rigid Triaxial Rotor Model Description of γγ-Band in Some Even Nuclei
AbstractThe odd-even staggering (OES) in γγ-band in rigid triaxial rotor model (RTRM) is investigated at different asymmetry. It is found that the OES in γ-band and γγ-band obtained from rigid triaxial rotor model (RTRM) are different with some details, essentially, they are similar: both of them are constant for an axial rotor and st aggering appears in same phase for a rotor with large triaxial deformation. The onset of zigzag behavior of staggering indicesS(I) in γγ-band appears fromS(8) at γ = 25° however, in γ-band fromS(8) at γ = 15°. Thus, similar OES curve in theory and experiment at specific asymmetry...
Source: Physics of Particles and Nuclei Letters - April 1, 2022 Category: Physics Source Type: research

On the d*(2380)
AbstractThe Juelich Cooler Synchrotron (COSY) observed a resonant state in the two-baryon system with mass 2380 and width of 70 MeV. This state is denoted by the\(d{\text{*}}(2380)\) and has quantum numbers\(I({{J}^{p}}) = 0({{3}^{ + }})\). There is a debate whether it is a hadronic molecule or a compact hexaquark. We calculate the\(d{\text{*}}(2380)\) mass by using contact type effective potential consisting of only color-spin part. With a focus on the\(d{\text{*}}(2380)\) we consider its importance as a new degree of freedom. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - April 1, 2022 Category: Physics Source Type: research

Main Results of Neutronical Study about ADS with Ion Beams and Implications on Experiments Planning
AbstractThe conditions which maximize the efficiency of an accelerator driven systems (ADS) are reviewed. The influence of particle beam, accelerator type, target geometry and composition are studied, searching for the conditions which ensure high energy gain, safe exploitation and deeper burning of the actinides, with longer periods between refueling. A core with criticality coefficientkeff of 0.985 –0.988, lower enrichment, converter of beryllium with radius 10–20 cm and length 110–120 cm represents a proper choice. The advantage of ion beams from7Li and20Ne with energies from 0.25 to 0.75 AGeV is underlined. Value...
Source: Physics of Particles and Nuclei Letters - April 1, 2022 Category: Physics Source Type: research

Installation for Manufacturing Straw Detectors for the Comet Experiment
AbstractThe article is devoted to the creation of an experimental SRP-STRAW installation manufacturing unique STRAW detectors for the joint JINR-KEK experiment COMET. The method of welding straw tubes applying ultrasound greatly simplifies the technology of their production compared to the case of twisted tubes made by spiral winding and gluing two layers of mylar. The amount of matter decreases, which is important to minimize multiple scattering. The reduction of multiple scattering is also facilitated by a decrease in the level of gas leakage from the tubes. The measured parameters of the tubes showed the high quality of...
Source: Physics of Particles and Nuclei Letters - April 1, 2022 Category: Physics Source Type: research

Structure of Nucleons and Their Interaction in the Concept of Nonperturbative QCD as a Pressing Issue of 21st-Century Physics
AbstractThe problem of the structure of nucleons and their interaction in the concept of nonperturbative QCD is discussed as an approach to studying the transformation of current quarks into constituent ones and the search for the mechanism of such a transformation, creating the bulk of the nucleon mass. Attention is drawn to the possibilities offered by studying central nucleon-nucleon collisions in this aspect. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - February 1, 2022 Category: Physics Source Type: research

Study of Mass Spectra and Decay Properties of D Meson in a Relativistic Independent Quark Model
AbstractWe compute theS-wave\(~D(c\bar {s})\) meson spectra using the independent quark model of scalar plus vector with square root potential model. The calculated states inS-wave, 13S1(2009.14), 11S0(1865.96), 23S1(2607.19), 21S0(2536.73), 33S1(3215.43), 31S0(3189.12), 43S1(3552), 41S0(3492) are closely matching with experimental data of the BABAR collaboration. According to this relativistic Dirac formalism, radiative decay and pseudoscalar decay constant (\({{f}_{{\text{p}}}} = 204.26{\text{ MeV }}\)) of D meson is nearly identical to the theoretical, lattice, and experimental results. We get results for leptonic decay...
Source: Physics of Particles and Nuclei Letters - February 1, 2022 Category: Physics Source Type: research

Monte Carlo Studies of the MPD Detector Performance for the Measurement of Hypertritons in Heavy-Ion Collisions at NICA Energies
AbstractHeavy-ion collisions at NICA energies provide a unique opportunity for the study of the production of hypernuclei in dense baryonic matter. In this paper, the details of the reconstruction procedure for hypertritons with the MPD detector in Bi + Bi collisions at NICA energies are presented. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - February 1, 2022 Category: Physics Source Type: research

Radiation Reaction in Noncommutative Electrodynamics
AbstractWe study the radiation reaction acting on an accelerating charge moving in noncommutative spacetime and obtain an expression for it. Radiation reaction, due to a nonrelativistic point charge, is found to receive a small noncommutative correction term. The Abraham –Lorentz equation for a point charge in noncommutative spacetime suffers from the preacceleration and the runaway problems. We explore as an application the radiation reaction experienced by a charge which undergoes harmonic oscillations in a noncommutative plane. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - February 1, 2022 Category: Physics Source Type: research