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Massless Representations of the ISO(1,5) Group
AbstractMassless irreducible representations of the Poincar é group in the six-dimensional Minkowski space are studied. The Casimir operators of the corresponding Poincaré algebra are obtained and their spectra are found on states corresponding to massless representations. It is shown that representations with finite spins (helicities) are defined by two n onnegative (half-) integer numbers, while representations of infinite (continuous) spin are defined by one real number and one nonnegative (half-) integer number. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - December 1, 2021 Category: Physics Source Type: research

Reference Radiation Field for GCR Chronic Exposure Simulation
AbstractA very urgent problem for space radiobiology is to model a chronic GCR exposure concerning simulations with animal models of human risks. However, it was impossible to realize similar irradiation in ground-based conditions until today because the use of heavy-ion accelerators for a long time for this purpose is not realistic. The booster of the Nuclotron —one of the heavy-ion accelerators of the NICA complex of Joint Institute for Nuclear Research—provides this unique possibility. The booster accelerates ions197Au to 578 MeV/n with a charge state of 31+. Before injection of the booster beam to the main heavy-io...
Source: Physics of Particles and Nuclei Letters - December 1, 2021 Category: Physics Source Type: research

Geometry of a Microelectronic Coordinate-Sensitive Detector of Charged Particles
AbstractThe optimal distance from a microchannel multiplier (MCM) that consists of two microchannel plates to the crystal of a large integrated circuit (LIC) is calculated. The geometry of the microelectronic coordinate-sensitive detector is determined and its housing is optimized. The geometry of the LIC input channels integrated into a coordinate-sensitive charged particle detector is determined. The resolution of the microelectronic coordinate-sensitive detector as a function of the geometric dimensions of the LIC input channels is obtained. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - December 1, 2021 Category: Physics Source Type: research

MCNP Simulations for Silver-Plastic Scintillator Detector for Mono-Energy Neutrons 2.5 and 14 MeV
AbstractIn this paper, a simulations using MCNP code were carried out to determine the behavior and the response of a highly sensitive silver-activation detector which used for neutron detection. The detector consists of sandwiched alternating thin-sheets of silver and plastic scintillator EJ-299-15 instead of NE-110. The simulations also tacked into account two mono-energy neutrons 2.5 and 14 MeV to get the most efficient design of detecting and registering signals due to fast-neutrons interactions with the active materials (silver) and the plastic scintillator EJ-299-15. The energy and charge deposition of neutrons, phot...
Source: Physics of Particles and Nuclei Letters - December 1, 2021 Category: Physics Source Type: research

Comparison of Dose –Response Curves between EBT-XD and EBT3 Radiochromic Films at High Dose Range (2000–4500 cGy) for a 175 MeV Proton Beam
AbstractTo characterise and compare the response of EBT-XD and EBT3 radiochromic films at high doses (up to 4500 cGy) for a 175 MeV energy proton beam. EBT-XD and EBT3 film dosimeters were irradiated by a proton beam with 175 MeV. In order to establish dose response curves, each film piece was exposed to radiation doses 50 –4500 cGy. The films were irradiated to doses of 200, 1000, 2000, and 4000 cGy and non-irradiated to determine the lateral response artifact (LRA) for varied lateral positions. The influence of film orientations (0°, 90°, and 45°) on the scanner bed was examined. Net optical density (netOD) for the films...
Source: Physics of Particles and Nuclei Letters - November 1, 2021 Category: Physics Source Type: research

Excitation of Isomeric States in the Reactions ( ?, n) and (n, 2n) on the 81Br Nucleus
AbstractThe cross sections for the formation of isomeric states in the reactions ( ?,n) and (n, 2n) on the81Br nucleus were measured by the induced activity method. The energy dependence of the isomeric ratio of the reaction yields ( ?,n) in the energy range 14 –35 MeV with a step of 1 MeV was obtained. The experimental results are compared with the data of other works and the TALYS-1.6 calculation. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - November 1, 2021 Category: Physics Source Type: research

Optical and Double Folding Model Analysis of 28Si( ?,?)28Si Elastic Scattering from 12.7 to 240 MeV
AbstractIn this paper the experimental data on the angular distribution of elastic scattering of ?-particles on28Si target nucleus in the energy range from 12.7 to 240 MeV are analyzed using FRESCO code. The analysis in the framework of the optical model (OM) has been performed in two different potential sets. In the framework of the double-folding model (DFM), we created the real optical potential using a density dependent version of M3Y interactions (BDM3Y1) based on the G-matrix elements of the Paris nucleon-nucleon (NN) potential. The renormalization factor of folded potentialNr has been extracted and its energy depend...
Source: Physics of Particles and Nuclei Letters - November 1, 2021 Category: Physics Source Type: research

Thermodynamically Consistent Description of One-Phonon States Fragmentation in Hot Nuclei
AbstractThe fragmentation of one-phonon states in hot nuclei is studied. For this purpose, the quasiparticle-phonon nuclear model is extended to a finite temperature by applying the formalism of thermo field dynamics. It is shown that consistent application of the thermal state condition leads to the realization of the detailed balance principle at each stage of the thermal Hamiltonian diagonalization. The equations describing the coupling between thermal one-phonon and two-phonon states are derived. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - November 1, 2021 Category: Physics Source Type: research

Quantization of Nonlinear Fields Using Bogolyubov Variables
AbstractThis is the first in a series of three papers in which we propose a method for the quantization of nonlinear fields on the classical background using Bogolyubov variables. The first paper outlines the main ideas and the subsequent papers describe the development of the quantization scheme, as is exemplified by nonstationary interacting fields —scalar and gravitational ones. This method allows one to accurately take into account conservation laws and avoid the problem of zero modes. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - November 1, 2021 Category: Physics Source Type: research

Detailed Study of the MPD Detector Performance for Reconstruction of Hyperons in Heavy-Ion Collisions at NICA Energies
AbstractThe study of the production of hyperons in heavy-ion collisions at NICA energies is among the principal goals in the scientific program of the MPD experiment. In this paper, the details of the hyperon reconstruction procedure as well as MPD detector performance for the measurements of the hyperon production in centrality selected Au + Au collisions are presented. The investigation has been performed at the Laboratory of High Energy Physics, JINR. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - November 1, 2021 Category: Physics Source Type: research

Comparison of Dose –Response Curves between EBT-XD and EBT3 Radiochromic Films at High Dose Range (2000–4500 cGy) for a 175 MeV Proton Beam
AbstractTo characterise and compare the response of EBT-XD and EBT3 radiochromic films at high doses (up to 4500 cGy) for a 175 MeV energy proton beam. EBT-XD and EBT3 film dosimeters were irradiated by a proton beam with 175 MeV. In order to establish dose response curves, each film piece was exposed to radiation doses 50 –4500 cGy. The films were irradiated to doses of 200, 1000, 2000, and 4000 cGy and non-irradiated to determine the lateral response artifact (LRA) for varied lateral positions. The influence of film orientations (0°, 90°, and 45°) on the scanner bed was examined. Net optical density (netOD) for the ...
Source: Physics of Particles and Nuclei Letters - November 1, 2021 Category: Physics Source Type: research

Pauli Ionization Mechanism for Recoil Atoms in Matter
AbstractFree-electron emission by stopping recoil atoms arising from particle –atom collisions in a noble-gas medium is numerically investigated using argon as an example. We demonstrate that, during propagation through matter of recoil atoms with energies over a few keV, vacancies in their internalL-shells arise via the Pauli mechanism with a probability on the order of 100%. As a result, over 30 free electrons are released upon a single interaction act in liquid or gaseous noble gas as a working medium of a particle detector. Thereby, the sensitivity of an argon-filled particle detector is significantly enhanced. In a ...
Source: Physics of Particles and Nuclei Letters - November 1, 2021 Category: Physics Source Type: research

Excitation of Isomeric States in the Reactions ( γ, n) and (n, 2n) on the 81Br Nucleus
AbstractThe cross sections for the formation of isomeric states in the reactions ( γ,n) and (n, 2n) on the81Br nucleus were measured by the induced activity method. The energy dependence of the isomeric ratio of the reaction yields ( γ,n) in the energy range 14 –35 MeV with a step of 1 MeV was obtained. The experimental results are compared with the data of other works and the TALYS-1.6 calculation. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - November 1, 2021 Category: Physics Source Type: research

Prototype of the Digital Electronics Chain for the GABRIELA Detector Assembly and First Tests
AbstractThis paper describes a digital electronics chain prototype for the GABRIELA detector assembly. The goal of the digital algorithm is to reduce the dead time of the electronics to tens of nanoseconds without loss of energy and time resolution. The structure and temporal diagrams of the algorithm are given in the text. The paper also shows the energy resolution of the algorithm in comparison with the existing analog system and the results of the first in beam run. (Source: Physics of Particles and Nuclei Letters)
Source: Physics of Particles and Nuclei Letters - November 1, 2021 Category: Physics Source Type: research

Optical and Double Folding Model Analysis of 28Si( α,α)28Si Elastic Scattering from 12.7 to 240 MeV
AbstractIn this paper the experimental data on the angular distribution of elastic scattering of α-particles on28Si target nucleus in the energy range from 12.7 to 240 MeV are analyzed using FRESCO code. The analysis in the framework of the optical model (OM) has been performed in two different potential sets. In the framework of the double-folding model (DFM), we created the real optical potential using a density dependent version of M3Y interactions (BDM3Y1) based on the G-matrix elements of the Paris nucleon-nucleon (NN) potential. The renormalization factor of folded potentialNr has been extracted and its energy depen...
Source: Physics of Particles and Nuclei Letters - November 1, 2021 Category: Physics Source Type: research