
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.
2024 
E4202427 (1.257.216)
Efimov A. D., Izosimov I. N.
Advanced Microscopic IBM1 Version. Description of the Crossing of Bands in Xe and Th Isotopes
The boson representation of fermion operators is used. A
method is described for calculating the parameters of boson operators based
on consideration of matrix elements between phonon states with a minimum
number of the latter. The configuration space of bosons is expanded up to
bosons with multipole J = 14^{+}. Within the framework of this method, the
effect of backbending in even isotopes ^{112–128}Xe is considered, where
it is clearly manifested. In even ^{220–236}Th isotopes, where backbending
is observed only for the lightest of these nuclei, the intersection of bands
is obtained only for two nuclei. Moreover, for ^{222}Th it is so smooth
that it does not appear through the moment of inertia. Among the properties,
the energies of the yrast bands and the values of B(E2) are considered.

P13202422 (6.474.596)
Pepelyshev Yu. N. et al.
Preliminary Computations for the Pulsed Reactor IBR4. Optimization of the Neutron Flux
The IBR4 pulsed reactor with a power of 4 MW and a pulse repetition
frequency of 10 s^{–1} is considered as a pulsed neutron source to replace the
IBR2M reactor, which will be decommissioned by the end of the thirties. The
design of the IBR4 is based on the MBIR reactor with some rearrangement of
the core. The core, with the changes made, ensures the nuclear safety of the
reactor and minimizes the lowfrequency fluctuations in pulse energy
inherent in periodic pulse reactors. The optimal design of the IBR4 core is
based on the basic design with the addition of beryllium reflectors and
small volume water moderators. The IBR4 reactor, with a relatively small
average power of 4 MW, makes it possible to obtain thermal neutron flux
densities on the surface of the water moderator for the derived neutron
beams at the level of 1.2 · 10^{14} cm^{–2} · s^{–1}, and in
the area close to the surface —
3.0 · 10^{14} cm^{–2} · s^{–1}.
Therefore, IBR4 is a powerful pulsed source of thermal neutrons.

E11202417 (469.408)
Gordeev I. S., Bugay A. N.
Computer Modeling of a New Type Galactic Cosmic Rays Simulator
A new type of a galactic cosmic rays (GCR) simulator, provided at the JINR Laboratory of Radiation Biology,
is potentially capable of generating a complex radiation field with inclusions of a variety of ions with a wide energy range
and with required abundance at the charged particle accelerators. This complex multicomponent radiation field simulates radiation
environment inside a spacecraft during an interplanetary flight, for example, to Mars. The paper provides an analytical description
of the GCR simulator as well as a description of a specially developed software that enables selection of necessary parameters of a simulator model
for creating relevant mixed radiation conditions. The software implements processing of data obtained with Monte Carlobased FLUKA and PHITS programs,
fitting and optimization of model parameters as well as data visualization tools.

D17202416 (43.002.580)
Shukrinov Yu. M., Botha A. E.
JINRUNISA Results of Collaboration on Theoretical Study of Josephson Nanostructures
An overview of the results obtained within the framework of the JINR—UNISA collaboration in the field of theoretical study
of Josephson nanostructures is presented. In particular, our work has involved studies of a wide variety of nonlinear
dynamic effects in various systems of coupled Josephson junctions, including superconductor/ferromagnet/superconductor junctions,
which are currently being investigated intensively due to the potential applications in superconducting electronics and spintronics.

E6202414 (177.455)
Izosimov I. N.
Manifestations of the Intermediate Structure
in the γ Decay of NonAnalog Resonances
The angular distributions of γ radiation during
the decay of nonanalog resonances in reactions ^{58, 60, 62}Ni (p, γ ) ^{59,61,63}Cu are analyzed. The coefficients of decomposition of angular
distributions by Legendre polynomials, the correlation of widths and the
distribution function of a mixture of multipoles δ for M1+E2 γ decays of nonanalog resonances are analyzed. Unambiguous evidence of the
nonstatistical nature of the studied resonances has been obtained. A possible reason for the manifestation of nonstatistical effects in
(p, γ ) reactions is discussed.

E4202413 (177.455)
Kuz'min V. A., Tetereva T. V.
Formation of Superconducting Pair Correlations in Spherical EvenEven Nuclei
The appearance of like nucleon pair correlations in the ground state of spherical eveneven nuclei is considered within
the special Bogoliubov transformation. It is confirmed that in closed subshell nuclei, superconducting pair correlations appear if the
coupling constant G exceeds a certain threshold value. Rough upper and lower estimates are obtained for the threshold value.
It is shown that superconducting correlations exist in open subshell nuclei at any positive G. In this case, nucleon pairs are distributed
over all subshells participating in the pairing interaction.

P1320247 (3.929.070)
Pepelyshev Yu. N. et al.
Preliminary Computations for the Pulsed Reactor IBR4. Basic Composition
By the end of the thirties, the IBR2M reactor will be decommissioned.
The authors suggested that after the decommissioning of the reactor, they should not create an absolutely new neutron source,
which would require significant development work, but use positive technical solutions tested at other fast neutron nuclear facilities,
for example, IBR2, IBR2M, MBIR, BOR60, BN1200 and others. This is a conceptual vision of a new source, called IBR4. Special attention
in IBR4 was devoted to the issues of stable reactor dynamics. The article is based on calculations for the socalled basic composition
of the IBR4, which considers the fundamental possibility of implementing positive technical solutions. In the next work, based on the basic composition,
the IBR4 core and its immediate environment — all that makes it possible to increase the density of the thermal neutron flux on the extracted
neutron beams and at the same time fully ensure the reliability and safety of the reactor — will be considered. It is expected that the parameters
of the IBR4 will be significantly higher than the parameters of the IBR2M.

P1120245 (683.575)
Bureš M. et al.
Application of the Hopfield Network to SPD Track Reconstruction
One of the key stages of processing data from particle physics experiments is the reconstruction
of trajectories (tracks) of interacting particles from measurement data. In the SPD experiment planned at the NICA collider,
a special difficulty will be caused by the extremely high frequency of interactions (3 MHz), which leads to overlapping of events during
the data acquisition in the timeslice mode, as well as by the strong contamination of data by fake measurements due to the specifics of
the track detectors. This makes track reconstruction (tracking) algorithms very complicated.


