Pepan Letters
Annual Reports
To Authors

Preprints and Communications

Here you can find JINR preprints and communications in pdf format starting from 1999. File size is given in bytes in round brackets.

Subject Categories for JINR Publications Archive (1999 - 2022)


P5-2023-54 (138.132)
Yamaleev R. M.
Evolution Equations of Higher Order Kinematics

The path length traveled by an accelerated body with constant acceleration is described by the polynomial of second degree in time. In this work, we develop a generalized kinematics, where the distance, velocity, acceleration and higher order accelerations are determined by the higher degree polynomials. The evolution equations derived in this scheme are cast into the triangular-like systems and form the Appell sequences of polynomials admitting the Pascal-matrix representation. By making use of the mathematical tool developed with respect to the higher order kinematics, the evolution equations for the extended classical mechanics are derived. It is shown that the relativistic mechanics and extensions of the classical mechanics are naturally cast into the frames of the elaborated mathematical tool.

P18-2023-47 (63.010.639)
Shabalin A. D.
Influence of Ionizing Radiation on Frond Morphology of Some Fern Species

The present study is aimed at detecting and monitoring the ongoing mutational morphological changes of four species of pteridoflora (Athyrium filix-femina, Dryopteris dilatata, Gymnocarpium dryopteris and Phegopteris connectilis) of the Dubna urban district in a natural forest growing environment during an experiment on irradiating these plants with gamma rays on the 3rd channel of the IBR-2M reactor of the Laboratory of Neutron Physics of the Joint Institute for Nuclear Research. In the course of the study, photographs of morphological changes in the structure of fronds were obtained relative to control samples that were not subject to irradiation, and conclusions were drawn regarding the effect of gamma irradiation on the pteridoflora of the urban district of Dubna.

P4-2023-41 (201.273)
Kuz'min V. A., Tetereva T. V.
Ordinary Muon Capture by Cadmium Nuclei

The partial and total rates are calculated for the ordinary muon capture by even cadmium isotopes. The theoretical rates are compared with experimental data. The theoretical total rates of muon capture agree with the experimental ones well.

1-2023-39 (8.974.601)
Komarov V. I.
Memories of Bruno Pontecorvo

The notes describe the communication of a researcher V. I. Komarov at the Laboratory of nuclear problems with an outstanding physicist of the twentieth century, Bruno Pontecorvo. The memory of work and friendly relations allows to see features of a portrait of an outstanding scientist at the angle of his relationship with ordinary people.

P13-2023-35 (790.678)
Agapov A. V. et al.
Delivery of High-Intensity Proton Beam for the Study of Flash Effect in Radiotherapy

Flash therapy is a rapidly developing field of radiology that has the potential to revolutionize future cancer treatment techniques. The method involves delivery of the therapeutic radiation dose to the tumor volume at an ultra-high dose rate in the beam, several orders of magnitude higher than that usually used in conventional radiotherapy. In this mode of irradiation, the degree of damage to normal tissues surrounding the tumor and falling under the influence of radiation decreases, at the same time, the effect on cancer cells remains at the same level, which preserves the prospect of local control of the tumor with a lower frequency of side effects. The paper presents the results on the delivery of a high-intensity proton beam with an energy of 660 MeV from the Phasotron of JINR (Dubna), designed for radiobiological studies under flash-therapy irradiation of cell cultures and small laboratory animals (mice, rats). In addition, the main design features and parameters of the created detectors for measuring the characteristics of this beam are presented.

E11-2023-37 (2.645.236)
Chervyakov A. M.
On Finite-Element Modeling of Large-Scale Magnetization Problems with Combined Magnetic Vector and Scalar Potentials

A numerical performance of finite-element modeling based on the combination of magnetic vector and total scalar potentials is assessed against the vector potential formulation for two magnetization problems, the Helmholtz coil and the dipole magnet. The potentials are applied to conducting and nonconducting parts of the problem domain and coupled together across their common interfacing boundary. Thin cuts are constructed in the current-free regions to ensure the consistency of the formulation. Simulation results show a substantial reduction in the computational cost provided by the mixed formulation compared to its vector counterpart for a similar accuracy of both methods.

P13-2023-34 (298.980)
Agapov A. V., Mytsin G. V., Shipulin K. N.
Development of Ionization Chambers for Monitoring High-Intensity Radiation Beams

In the Medical-Technical Complex of the DLNP JINR, two air ionization chambers were developed and tested as part of a research project exploring the «Flash effect» caused by a proton beam with an ultra-high dose rate on biological objects. The first chamber, a monitor parallel-plane chamber with an ultrathin gap, has a narrow interelectrode air gap of only 0.5 mm which ensures efficient charge collection and no recombination during measurements of high-intensity pulsed (with a duty cycle of 100) proton beams. The second chamber features a parallel-plane monitor chamber for dose delivery monitoring and a multi-pixel ionization chamber for beam spatial characteristic control. Electronic components and software were also developed for the cameras. Tests demonstrated the chambers' full operability when measuring high-intensity proton beam parameters from the JINR Phasotron.

P19-2023-31 (227.167)
Rzyanina A. V. et al.
Research on Survival of 549 Tumor Cells under Proton Beam Irradiation in Flash and Conventional Mode

Flash radiotherapy is an innovative method of irradiation, which ensures the delivery of the therapeutic dose to the pathological focus in a time of about several tens of milliseconds. In this mode of irradiation, the degree of damage to normal tissues surrounding the tumor and falling under the influence of radiation decreases; at the same time, the effect on cancer cells remains almost at the same level, which improves the prospect of local control of the tumor with a lower frequency of side effects. To date, the exact radiobiological mechanisms underlying the flash effect are not fully clear. The paper presents the results on the delivery of a high-intensity proton beam with an energy of 660 MeV from the Phasotron of JINR (Dubna) designed for radiobiological studies under flash technique of irradiation of cell cultures and small laboratory animals (mice, rats). The survival rate of A549 cells under proton beam irradiation in two modes, flash and standard, was also compared.

E6-2023-29 (108.061)
Izosimov I. N.
Application of the Method of Moments for the Doublet and Triplet Analysis in the Radiation Spectra

When processing spectra, it is usually sufficient to determine only the positions of the peaks and their areas. To use the method of moments for doublet peaks analysis, it is necessary to first construct (calibrate) the dependence of the second and third moments for single peaks on the energy of the corresponding radiation. After such calibration overlapping peaks can be separated. To separate peaks in doublet using the method of moments, it is necessary to solve a quadratic equation. To separate peaks in triplet, it is necessary to have appropriate calibration curves already up to the fifth moment inclusive and solve a cubic equation. Examples of the separation of overlapping peaks in the analysis of gamma-ray spectra are presented.

P13-2023-28 (1.527.321)
Nikitenko Yu. V.
Accumulator of Cold and Very Cold Neutrons

Circle mirror accumulator of cold and very cold neutrons for neutron source is proposed. The relations are obtained for calculating of accumulator parameters, neutron current density and hold time. It is shown the gain factors for current density and hold time can achieve a hundred. Some possibilities of creating and using an accumulator in physical investigations are considered.

P10-2023-27 (253.368)
Morkovnikov I. A., Truntova L. A.
PyChannel Messaging Service in Sonix+

We consider the development of the PyChannel messaging service for the Sonix+ software package, which provides control of the measuring facilities at the IBR-2 reactor at FLNP JINR. The need for this was determined by the fact that the current implementation of the inter-module communication protocol based on the Varman database cannot provide data exchange between modules running on different computers and servers with different operating systems, as well as the interaction of 64-bit and 32-bit programs. The article describes the adaptation of PyChannel to the needs of different programs that are part of the software package in order to create a unified service to extend the capabilities of Sonix+.

P16-2023-24 (1.837.880)
Mokrov Yu.V. et al.
Experimental Research of the Response of the Albedo Individual Neutron Dosimeter DVGN-01 in the Field of the Accelerator DC-280 to Correct Its Readings

The paper presents the results of an experimental research of the response of albedo individual neutron dosimeters DVGN-01 of the AKIDK-301 and AKIDK-302 complexes in order to correct their readings.
Correction of the DVGN-01 readings was carried out using correction coefficients, which were determined by the results of measurements using a spherical albedo system when it was irradiated at eight points on the DC-280 accelerator: in the accelerator hall near the radiation monitor and in front of the protective door from the accelerator hall, in the beam output cabins (rooms 113 and 115) and in a permanent staff room on the second floor near the accelerator. The obtained values of the coefficients are in good agreement with the coefficients obtained earlier on the FLNR accelerators and currently used in individual dosimetric control of laboratory personnel.

P1-2023-22 (2.405.634)
Belyaev A. V.
Finding the Mass of a Charged Particle According to the Shape of Its Trajectory, and Hypothesis of Anomalous Lepton Existence Test

According to the current state of the theory of particle physics, the number of generations of leptons (and quarks) is three. In this case, however, the mass distribution of the three known leptons is such (me ∼ 100, mμ ∼ 102, mτ ∼ 103 MeV/c2) that the hypothesis of the possible existence of a fourth anomalous lepton with a mass ma ∼ 101 MeV/c2 often arises. Such a large difference in the masses of leptons is not fully explained at present. In this paper, we directly test the hypothesis of the existence of a lepton with a mass ma ∼ 101 MeV/c2. Thus, a method is proposed for finding the mass of a charged particle by the spatial trace (track) left by it, passing through matter in a uniform magnetic field near the stopping point. In the projection of the spatial track onto a plane perpendicular to the direction of the field, the particle trajectory is approximated by a helix («hadroide»), one of whose parameters is proportional to the particle mass. The initial energy of the particle does not matter for this problem. In accordance with the method, the mass of the particle is found.

P10-2023-21 (350.755)
Belyaev A. V., Rikhvitsky V. S.
Kinematic Fitting in the Restored Film Information Processing (FIP) in Pictures from Bubble Chambers

The VisualGeoKinFit procedure for kinematic fitting as part of the reconstructed film information processing on photographs of bubble chambers is presented. Photographs of 1-meter hydrogen and 2-meter propane chambers, which were obtained in the measurement sessions of the 60s90s of the 20th century at JINR, are considered.

P1-2023-20 (278.002)
Rikhvitsky V. S., Belyaev A. V.
Polynomial Approximation of the Magnetic Field for Track Detector

The magnetic field of the 1-meter hydrogen bubble chamber at LHE JINR was measured in 1971. In the programs for the geometric reconstruction of physical events, these data were used to calculate the field at arbitrary points in space using linear interpolation methods. It is convenient to approximate the measured magnetic field by polynomials, which makes it possible to exploit the connections imposed by the magnetic field equations. The method of least squares is used to construct basic polynomials that satisfy the Laplace equation. The proposed method for constructing the basis was implemented and used in a number of programs for processing experimental data obtained on track detectors. The presented method can be applied not only to bubble chambers, where the field is stationary and close to uniform, but also to other track detectors.

P10-2023-19 (556.856)
Belyaev A. V., Rikhvitsky V. S.
Refinement of Optical Constants for Bubble Chambers

At JINR, on the new software and hardware complex, the film information processing (FIP) for bubble chambers (1-meter hydrogen and 2-meter propane) was restored, which was obtained in the measurement sessions of the 6090s of the 20th century at JINR. During the restoration, inaccuracies were found in the spatial reconstruction of the points. A minimization algorithm has been found that refines the «optical constants» of photographic lenses and their location in the common Cartesian coordinate system of cameras.

P10-2023-18 (2.096.993)
Baldin A. A. et al.
Recovery of the Software and Hardware Complex for Film Information Processing (FIP) for Bubble Chambers

The complex for film information processing (FIP) obtained on bubble chambers has been restored. A procedure for the geometric reconstruction of spatial coordinates obtained from measurements on photographs of bubble chambers is presented. This procedure is a significant modification of the previous one. The work of the FIP is demonstrated in the photographs of the 1-meter hydrogen and 2-meter propane chambers, which were obtained during the measurement sessions of 1960-2000 at JINR. The reconstructed FIP complex adequately corresponds to, and in some ways even surpasses, the previously existing complex in the main parameters: spatial resolution and processing speed.

P10-2023-14 (1.590.162)
Kirilov A. S. et al.
Reorganization of the Sonix+ Software Package to Work with Data in the Event List Form

In the coming years the application of new DAQ controllers in which there is no hardware data histogramming will become more and more widespread at the IBR-2 instruments. At the same time, the primary data presentation in the histogram form is replaced in favor of accumulation in the form of a list of individual events, which corresponds to the global trend. This will entail a certain restructuring of the Sonix+ complex. Thus, on the one hand, histograms should be kept for operative visualization, as well as for data reduction programs, which are specific for each instrument. On the other hand, the hardware sampling limitation in the construction of these histograms is removed, which is expected to lead to a significant increase in histogram size, including exceeding the limit of available virtual address space for 32-bit applications in practice.

P13-2023-13 (721.699)
Butusov I. V. et al.
Stabilized Gas Installation for Filling Charged Particle Detection Systems

A setting has been worked out for filling various systems with gas, from gas detectors of ionized radiation to vacuum chambers of magnetic analyzers and separators. The setting meets all the necessary conditions for filling these systems: high stability in pressure, gas flow and temperature. The described system is successfully used in detectors and settings of the Flerov Laboratory of Nuclear Reactions.

E13-2023-12 (243.191)
Gapienko I. V. et al.
Research and Development of the Polarized Deuteron Source for the Electrostatic Accelerator

The prototype of a polarized deuteron source was made for the Van de Graaff accelerator of the Czech Technical University in Prague with the aim of creating a full-scale setup for producing a polarized neutron beam for experiments on measuring ΔσL and ΔσT, longitudinal and transverse spin asymmetries in transmission of a polarized neutron beam through a frozen polarized deuteron target. The method is based on Kaminsky's experiment on channeling deuterons through a magnetized single-crystal Ni foil 1-2 μm thick. It is proposed to use the reaction T(d,n)4He with polarized deuterons of an energy of 150-200 keV. For a nonchanneled beam (the goniometer in a random position), the tensor polarization measurements were carried out with a TiT target. Our result is Pzz=-0.10±0.02. This indicates that the deuterium atoms that have passed outside the channels also become polarized due to the capture of polarized electrons from the nickel crystal.

E10-2023-11 (535.814)
Lenivenko V., Palichik V., Patsyuk M.
Reconstruction of Simulated and Experimental Data in Coordinate Detector Systems Upstream of the Analyzing Magnet of SRC at BM@N Experiment in 2018

Multiwire proportional chambers and silicon detectors were located upstream of the analyzing magnet at the SRC at BM@N setup during the 2018 measurement. The reconstruction for these coordinate detectors was developed for both simulated and experimental data. The developed algorithms were added to the official software. The reconstruction results of the 2018 data were compared with the simulation. The main characteristics of the coordinate detectors upstream of the dipole magnet were evaluated and analyzed.

P13-2023-10 (1.539.579)
Vovchenko E. D. et al.
Experimental Laser-Plasma Diode with Magnetic Insulation for Neutron Generation

The simulation results of a diode accelerator for generating neutrons using a laser source of deuterons and a system for suppressing electronic conduction by magnetic fields are presented. Options of the formation of an insulating magnetic field by ring permanent magnets and a spiral electrodynamic line are considered. The possibility of realizing an efficient pulsed neutron generator based on such an accelerator is shown. The results obtained in numerical and physical experiments allow one to expect the achievement of record values of the energy cost per one neutron yield using the nuclear reaction T(d,n)4 He.

P9-2023-9 (2.974.825)
Baturitsky M. A. et al.
TESLA-Type Superconducting Accelerator Niobium Resonators for Electrons and Positrons

The monograph is devoted to the development and creation of prototypes of superconducting niobium resonators in which electromagnetic field energy is transferred to accelerated charged particles. These studies were carried out as part of JINR's participation in the ILC project in accordance with the scientific theme 02-0-1067-2007/2015 (Leader G. D. Shirkov) «Research in the field of e+e linear accelerators and colliders of a new generation for fundamental and applied purposes». For this purpose, Yu. A. Budagov organized the production of a working sample of a TESLA-type superconducting resonator from Fermilab (USA), which was used as a reference and for setting up measuring equipment. On the initiative of Yu. A. Budagov, work was organized in Minsk to create superconducting microwave resonators of this type by the leading research organizations of the Republic of Belarus. A complete production cycle of manufacturing parts of superconducting niobium resonators was developed, all the necessary technological equipment was created, and two resonators were manufactured. According to the test results, a Q factor of 1.5 · 109 was achieved on one of them.

P13-2023-3 (686.737)
Perelygin V. V.
The CMS Muon System

The muon system of the CMS facility (CERN) is presented, which uses detectors of three types: drift tubes, resistive plate chambers, and cathode-strip chambers. The characteristics of the muon system during the period of CMS data taking with pp collisions in 2016-2018 are given. Plans for the development of the muon system under the Phase II CMS upgrade project are presented. The problems of replacing greenhouse gases used in CMS muon detectors with gases with a lower global warming potential are discussed. The results of studying the effects of radiation aging of cathode-strip chambers at the GIF++ facility (CERN) are presented. The possibility of CSC operation with a reduced content of CF4 in the working gas mixture is being investigated.