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Physics of Particles and Nuclei Letters
Journal Prestige (SJR): 0.245  Number of Followers: 1  Hybrid journal (It can contain Open Access articles)ISSN (Print) 1531-8567 - ISSN (Online) 1547-4771 Published by Springer-Verlag  [2467 journals]
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- Monte Carlo Simulation of the Experimental Setup for Studying Entangled
Annihilation Photons-
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Abstract: This work presents the GEANT4 simulation of the experimental setup for studying the Compton scattering of annihilation photons and compares the simulation results with the experimental data. Two 511 keV photons are born in electron-positron annihilation at rest and have mutually orthogonal polarization which is measured by the system of Compton polarimeters. Each polarimeter consists of scatterer of initial annihilation photons and NaI(Tl) detectors of scattered at 90° photons. Additionally, an intermediate scatterer of GAGG scintillator is used to produce the tagged decoherent photons. Different cases of two-photon quantum states have been simulated. In the first case, the setup response to Compton scattering of entangled photons with mutually perpendicular polarization was studied. In the second case similar study was done for decoherent photons that are produced if one of the initial photons interacts in intermediate scatterer. Distinctions in Compton scattering for these two cases have been obtained and compared to the experimental results. Energy spectra in NaI(Tl) detectors and angular distributions of scattered photons are presented for both entangled and decoherent cases.
PubDate: 2022-12-01
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- Operating Principles of the Joint Institute for Nuclear Research Grid Site
Accounting System-
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Abstract: The basic operating principles of a new accounting system for JINR Tier1 and Tier2 grid sites, which are components of the Multifunctional Information and Computing Complex (MICC) of the Meshcheryakov Laboratory of Information Technologies, are revealed. The new system completely repeats the functionality of the older system, significantly expands its capabilities, and is integrated into the general MICC monitoring system (LITMon).
PubDate: 2022-12-01
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- Optical Fiber Splitter for Photodetector Testing
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Abstract: This paper presents the design and study of an optical fiber splitter with a uniformity of light distribution better than 10%. The main idea is to place the fibers equidistantly from the center, simplifying manufacturing and providing better uniformity of the light intensity compared to a beam splitter. Such a splitter is convenient to use for the mass characterization of photodetectors in single-photoelectron mode, because the same statistical accuracy is ensured during simultaneous testing.
PubDate: 2022-12-01
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- Exploring Dynamics of A4 Flavour Symmetry Using Low Scale Seesaw
Mechanisms-
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Abstract: Low scale seesaw models, like low scale type II, inverse (ISS), and linear seesaw (LSS) models provide an interesting mechanism to obtain light neutrino masses and mixings, as they can be tested in future TeV scale experiments. Discrete flavour symmetry groups like \({{A}_{4}}\) can be incorporated to explain the flavour structure of particles. But, so far, nothing is known about dynamics of flavour symmetry—scale of its breaking, or VEV alignment of the flavon fields. In a recent study [1], we have investigated and shed light on how to pinpoint the favoured VEV alignment of the flavon field using light neutrino oscillation data. In this work, for the first time, we present an analysis on dependence of light neutrino masses on scale of flavon VEV in these three seesaw models, and comment on how this information can be used to discriminate among them. We also discuss about the estimated value of the constant \(F\) which can constrain various coupling constants of the model, cut-off scale of the theory and scale of flavour symmetry breaking. This study can provide useful insight into the hitherto unknown dynamics of flavour symmetry and hence can contribute as an important ingredient in the model building for future studies.
PubDate: 2022-12-01
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- Radiation Resistance of SiC Detectors after Neutron Irradiation
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Abstract: The characteristics of detectors based on silicon carbide (SiC) before and after irradiation with integral neutron fluxes of 5.11 × 1013 and 5.39 × 1014 n/cm2 are presented. On the samples irradiated with the maximum fluence, using alpha particles, a deterioration in the energy resolution by an order of magnitude and a decrease in the efficiency of charge collection by ∼25% are shown.
PubDate: 2022-12-01
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- Thermodynamic Characteristics of Doublets of Quadrupole Magnets for the
Booster Synchrotron at the NICA Accelerator Complex-
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Abstract: The booster synchrotron of the NICA accelerator complex in Dubna is designed for the preliminary accumulation and acceleration of heavy ions before injection into the Nuclotron. This article presents experimental and calculated data on the static heat leak and dynamic heat releases in quadrupole magnets of the booster synchrotron. The results will be taken into account for the development of new superconducting magnets and cryogenic installations.
PubDate: 2022-12-01
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- Optimization of the Ring Imaging Cherenkov Photodetector Shielding Box for
Compressed Baryonic Matter Experiment-
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Abstract: Compressed Baryonic Matter experiment at FAIR is devoted to the study of the strongly interacting matter properties at high baryonic densities and moderate temperatures. The systematic investigation of the Ring Imaging Cherenkov photodetector shielding box shape on its magnetic properties has been performed. It is demonstrated that the design of the shielding box with a “wing” located on the bottom plate and a back wall allows to decrease the stray magnetic field value in the vicinity of the photodetectors.
PubDate: 2022-12-01
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- Mobile-Based Accelerator Complex for the Detection of Nitrogen-Containing
Substances-
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Abstract: This article describes a method for detecting hidden nitrogen-containing substances. A description is given of a mobile complex based on a linear electron accelerator (LAE) capable of solving problems of detecting nitrogen-containing substances. The block diagram of the mobile complex is given and the accelerating system used for particle acceleration is described. The rotation of the electron beam is carried out using a special electromagnet located on the beam flight path. A drawing of such an electromagnet is given. The linear accelerator is placed in a container 6 m in length. The results of this work are of undoubted interest in solving problems related to detecting nitrogen-containing substances.
PubDate: 2022-12-01
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- Methods for Monitoring the Longitudinal Momentum Spread of Ions within a
Bunch during an Injection into a Synchrotron-
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Abstract: Methods for monitoring the longitudinal momentum spread of ions within a bunch during injections into a synchrotron are discussed. The method of moments for the distribution function of charged particles in a bunch is used when processing a digital signal for the pulse component of the current proportional to the longitudinal intensity of ions circulating in a synchrotron. Examples of using the proposed methods during the injection of a short bunch of carbon ions into the JINR superconducting booster synchrotron and Nuclotron are presented.
PubDate: 2022-12-01
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- On Model-Independent Analysis of $$B \to {{K}^{{(*)}}}\nu \bar {\nu }$$
Decays-
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Abstract: Semileptonic flavor changing neutral current transitions of \(B\) -mesons with a pair of neutrinos in the final state are very accurately determined in the standard model (SM) and, thus, provide a sensitive probe for physics beyond the SM. Until recently, the poor tagging efficiency for the \(B \to {{K}^{{(*)}}}\nu \bar {\nu }\) modes made them less advantageous as a probe of new physics (NP) compared to the charged lepton counterparts. The most recent Belle II [1] result on \({{B}^{ + }} \to {{K}^{ + }}\nu \bar {\nu }\) indicates a possible enhancement in the branching fraction of \({{B}^{ + }} \to {{K}^{ + }}\nu \bar {\nu }\) . Therefore, we explore the possibilities of an enhancement in a set of observables for \(B \to {{K}^{{(*)}}}\nu \bar {\nu }\) . We considered the weak effective theory extended by vector effective operators both with light left- and right-handed neutrinos. The latter can appear in various SM extensions, e.g., in models with additional \(Z{\kern 1pt} '\) boson.
PubDate: 2022-12-01
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- Towards the Structure of a Cubic Interaction Vertex for Massless Integer
Higher Spin Fields-
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Abstract: The structure of cubic Lagrangian vertex corresponding to the irreducible fields with helicities, \({{s}_{1}},{{s}_{2}},{{s}_{3}}\) in d-dimensional Minkowski space is clarified. The explicit form of the operator \({{\mathcal{Z}}_{j}}\) entering the vertex in a nonmultiplicative way (for \(j = 1\) considered in [6]) is obtained. The solution has been derived within BRST approach with complete BRST operators, which contain all constraints corresponding to the conditions that extract the irreducible fields, including trace operators.
PubDate: 2022-12-01
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- Study of Pion Production in νμ Interactions on 40Ar in DUNE Using GENIE
and NuWro Event Generators-
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Abstract: The study of pion production and the effects of final state interactions (FSI) are important for data analysis in all neutrino experiments. For energies at which current neutrino experiments are being operated, a significant contribution to pion production is made by resonance production process. After its production, if a pion is absorbed in the nuclear matter, the event may become indistinguishable from quasi-elastic scattering process and acts as a background. The estimation of this background is very essential for oscillation experiments and requires good theoretical models for both pion production at primary vertex and after FSI. Due to FSI, the number of final state pions is significantly different from the number produced at primary vertex. As the neutrino detectors can observe only the final state particles, the correct information about the particles produced at the primary vertex is overshadowed by FSI. To overcome this difficulty, a good knowledge of FSI is required which may be provided by theoretical models incorporated in Monte Carlo (MC) neutrino event generators. They provide theoretical predictions of neutrino interactions for different experiments and serve as a bridge between theoretical models and experimental measurements. In this work, we will present simulated events for two different MC generators—GENIE and NuWro, for pion production in \({{\nu }_{\mu }}\) CC interactions on 40Ar target in DUNE experimental set up. A brief outline of theoretical models used by generators is presented. The results of pion production are presented in the form of tables showing the occupancy of primary and final state pion topologies with 100% detector efficiency and with detection thresholds on pion kinetic energy. We observe that NuWro (v-19.02.2) is more transparent (less responsive) to absorption and charge exchange processes as compared to GENIE (v-3.00.06), pions are more likely to be absorbed than created during their intranuclear transport, and there is need to lower the detection thresholds on pion kinetic energy to improve detector efficiency for better results.
PubDate: 2022-12-01
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- Position-Sensitive Measurements of a Single-Mode Laser Beam Spot Using the
Dividing Plate Method-
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Abstract: New position-sensitive experimental results have been obtained using the Dividing Plates method to detect the displacement of a single-mode laser beam spot of various diameters. Measurements show that with this method it is possible to attain sensitivities down to 0.18 µm–1 for a laser beam spot diameter of 8.8 µm displaced over 2.4 µm diameter zone, defined as the area where measurements non-linearities are within 1%. The achievable measurement accuracy is limited by ADC noise and corresponds to ±0.030 nm. Application of the Dividing Plates method for position-sensitive measurements allows to build a compact version of the Precision Laser Inclinometer, the Compact PLI, with reduced overall dimensions of 20 × 20 × 20 cm3 and weight of approximatively 10 kg.
PubDate: 2022-12-01
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- Determination of Carbon Concentration in Soil Using the Tagged Neutron
Method-
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Abstract: The results of determining the mass concentration of carbon in soil are discussed. The measurements were made on a facility operating according to the tagged neutron method, which consists of irradiating samples with 14 MeV fast neutrons and detecting the characteristic spectra of gamma rays from inelastic neutron scattering at specific time ranges between neutron emission and arrival of the γ-quantum signal. The values of the accuracies of the measurements have been estimated, the standard deviation of the repeated measurements for concentrations of carbon of 1–3% was σr = 0.14%, the convergence to the calculated values was σr = 0.2%.
PubDate: 2022-12-01
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- Superluminal Particle Motion from the Hyperbolic Momentum Space Point of
View-
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Abstract: The tachyon problem is considered on the basis of the kinematics of the extended hyperbolic space of relativistic momenta, including a two-sheet hyperboloid of momenta of subluminal particles, a cone of massless particles propagating at the speed of light, and a one-sheet hyperboloid of momenta of superluminal particles. The concept of mutually polar four-dimensional momenta is introduced. It is shown that the four-momentum corresponding to infinite velocity is polar to the rest frame on the upper part of a two-sheet hyperboloid . The Lorentz transformation is found that translates an arbitrary four-momentum of a tachyon into a four-momentum which time component is zero (tachyon’s proper frame of reference). The kinematics of the decay of a tachyon into a particle and its antiparticle (neutrino-antineutrino) in an arbitrary frame of reference and in the tachyon’s proper frame is considered. A test for detecting such a process is proposed.
PubDate: 2022-12-01
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- Flash Method of Proton Therapy
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Abstract: The purpose of this review is to generalize the information available on the topic of the flash proton beam therapy method. Currently, research in this area is one of the flagships in the development of a proton therapy method for both medical centers and commercial companies that develop equipment and technologies for proton therapy. The published data on pioneering studies of proton irradiation by the flash method allow us to consider this method very promising for its development and use in medicine. At the same time, in this case, a large commercial component of this issue arises, since the promotion and development of the latest proton therapy technologies is one of the important components of competition in this market. In this regard, there is not that much open information about technological and methodological developments in this area. The authors of the review have tried to collect and combine the available information about the flash method of proton beam therapy to form an understanding of its features and advantages.
PubDate: 2022-12-01
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- Restrictions Imposed by the Wave Function on the Results of Particle
Momentum Measurements-
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Abstract: It is demonstrated with a particle in the one-dimensional configuration space (OCS) that knowledge of the wave function supposes more than statistical restrictions on the results of measurements. In particular, apart from the probability (density) field in the OCS, the wave function also suggests the existence of two fields that predict two (equiprobable) particle momentum values for each OCS point, and the average of these two momenta at each point is related only to the wave function phase, while their difference (coinciding with the Bohm quantum-mechanical potential) is related only to the wave function amplitude. An analogue of the Heisenberg uncertainty relation is obtained for both fields.
PubDate: 2022-12-01
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- Investigation of Light Collection in Scintillation Cubes of the SFGD
Detector-
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Abstract: This paper presents the results of measuring the parameters of scintillation cubes, which are elements of the active target of the upgraded near detector of the T2K experiment, with the scintillation of a polystyrene-based organic scintillator being excited by an ultraviolet LED. Most attention is paid to the study of light leaks through the side faces of the cubes. The measurement results show that an average value of the coefficient characterizing light leaks through one face of the cube is 0.026. The effect of heating scintillation cubes on the light collection from them and light leaks are studied. After keeping the cubes at a temperature of 60°C for 72 h, the light collection from the cubes and the light leaks remained at the same level.
PubDate: 2022-12-01
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- Manifestation of Reflection-Asymmetric Deformation in the Structure of
Superheavy Nuclei-
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Abstract: The characteristics of of alternating parity bands in transfermium nuclei with Z = 102–110 are calculated. The energy values of the lowest negative parity states and transitional dipole, quadrupole, and octupole moments are predicted. Assessments of the critical angular momenta at which the transition from oscillatory motion to stable reflection-asymmetric deformation occurs are performed. The calculations are carried out using the cluster model of a dinuclear system.
PubDate: 2022-12-01
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- The Study of Multi-Nucleon Transfer Reactions for Synthesis of New Heavy
and Superheavy Nuclei-
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Abstract: The standard reaction methods, such as fragmentation, fission or fusion used to synthesis exotic nuclei have reached their experimental limits. Multi-nucleon transfer (MNT) reactions are discussed as the potential method to reach the still unknown region of exotic proton/neutron rich heavy and superheavy nuclei. Studies of MNT reactions to follow this goal are presently a hot topic in diverse laboratories worldwide. At the velocity filter SHIP of GSI Darmstadt, our high sensitivity lead for the first time in collisions of 48Ca + 248Cm to the discovery of five new isotopes with Z \( \geqslant \) 92 produced in MNT reactions. As well, it enabled the observation of three nuclei of the quite heavy and neutron-rich isotope 260No. These results are very promising for further studies of MNT reactions for the synthesis of new heavy and superheavy nuclei. The implementation of improved detection efficiency, a faster data acquisition system, the use of various actinide targets, a longer irradiation time along with optimal field settings will be beneficial. This additionally allows to suppress high background and to observe new neutron-deficient nuclides in the Z \( \geqslant \) 92 region of interest with a half-life of up to microseconds, also several above target nuclides located close to the border in the present nuclear chart are possible to reach. In this context, first experimental tests for separation of the transfer products with the use of velocity filter SHELS at Flerov Laboratory of Nuclear Reactions, Joint Institute for Nucler Research, Dubna was performed. The applied fast detection systems assured its best possible performance similar to SHIP, for the future investigation of deep inelastic transfer collisions. In this review article, our results are discussed together with previous measurements, and perspectives will be given for the application of multi-nucleon transfer reactions to produce new heavy and superheavy isotopes. The project of new kinematic separator dedicated for the MNT reactions studies is also discussed. We plan to implement a project together with modernization of U400 cyclotron (U400R).
PubDate: 2022-12-01
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