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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.
| 2021 |
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P13-2021-30 (3.512.569)
Pepelyshev Yu. N., Sumkhuu D.
Optimization of Automatic Power Control System of the IBR-2M Pulsed
Reactor in the Presence of Instability
The paper presents the main results of computational and experimental
optimization of the automatic power control system (AR) of the IBR-2M pulsed
reactor in the presence of a high level of oscillatory instability.
Optimization of the parameters of the AR made it possible to significantly
reduce the influence of random and deterministic oscillations of reactivity
on the noise of the pulse energy, as well as to sharply reduce the
manifestation of the oscillatory instability of the reactor. As a result,
the safety and reliability of operation of the reactor has increased
substantially.
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P13-2021-29 (4.037.416)
Pepelyshev Yu.N., Tsogtsaikhan Ts.
The Dynamics of Oscillation Instability of the IBR-2M Reactor.
The Noise Analysis
The results of the study on noise dynamics and self-oscillations of the pulse
energy in the IBR-2M for period from 2012 at the power of 2 MW until the
middle of 2021 are presented. It is shown that with an increase in fuel burnup,
the power spectral density of the pulse energy noise becomes more complicated
and the amplitude of self-oscillations grows. Based on the data obtained, a
strategy was developed to suppress the oscillatory instability of the IBR-2M, up
to the life of the reactor in 2036. The need to continue research on the noise
dynamics and oscillatory instability of the IBR-2M reactor was shown
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P16-2021-25 (2.063.403)
Mokrov Yu. V., Morozova S. V., Schegolev V. Yu.
Determination of Correction Factors for Correction of the Individual Albedo Neutron Dosimeter DVGN-01 Readings in the Field of the DC-280 Accelerator
The paper presents the results of determining the correction coefficients for individual albedo
neutron dosimeters DVGN-01 of the AKIDK-301 complex for correcting their readings when used by personnel
in the field of the DC-280 accelerator.
The correction coefficients have been determined using a spherical albedo system under irradiation
at four points: in the accelerator hall near the radiation monitor and in front of the shield door from the accelerator hall (room 110) and in the beam output cabin (room 115). The obtained values of the coefficients
are in good agreement with the coefficients obtained earlier on the MC-400 and used in the individual
dosimetric control of the personnel of the FLNR.
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P3-2021-22 (474.392)
Frank A. I., Kulin G. V., Rebrova N. V., Zakharov M. A.
On the Possibility of Creating a UCN Source on a Periodic Pulsed Reactor
The possibility of creating a UCN source on a periodic pulsed reactor is
considered. It is shown that the implementation of the principle of time
focusing, based on nonstationary neutron diffraction, and the idea of pulse
filling of the trap for UCN allows us to create a sufficiently intense source
of UCN on a pulsed reactor of a moderate power.
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P4-2021-15 (341.197)
Efimov A. D., Izosimov I. N.
Systematic of the Yrast-Bands in the Region of Heavy and Superheavy Even-Even Nuclei
By using the extrapolation
method, the estimations of yrast-band level energies for heavy
and superheavy nuclei were obtained. For getting these estimations,
the information about the properties of the neighboring nuclei
was exploited. Such a method seems reasonable because for more
collective states in the considered region of nuclei the
yrast-band level energies varvary smoothly and slightly.
The obtained results are very significant both for the experiment
planning and for the analysis of the experimental data on the
observation and study of the β- and γ-decays of high-spin isomers in the region of heavy and superheavy nuclei.
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P13-2021-11 (1.934.096)
Pepelyshev Yu. N., Sumkhuu D.
The Cycle Changing of Dynamics of the IBR-2M Pulsed Reactor
It is shown that in the IBR-2M reactor by the end of the reactor cycle,
changes in dynamics are observed associated with a strong weakening of the
fast power feedback (PFB), as a result of which the reactor becomes
oscillatory unstable. When the reactor is shut down, negative changes in
dynamics disappear and the stability of the reactor is restored. Thus, the
reactor undergoes cyclic changes in the oscillatory instability. The
correlation between a fast PFB and a slow PFB is experimentally observed,
which makes it possible to almost completely eliminate the cyclic component
of instability by changing the control mode of rods of the control system.
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P6-2021-6 (292.654)
Mukhin R. S. et al.
Reconstruction of Spontaneous Fission Neutron Multiplicity Distribution
Spectra by the Statistical Regularization Method
We propose a technique for reconstructing the multiplicity distribution of spontaneous
fission neutrons using the Tikhonov regularization method. The results obtained for 252No, 244Fm, 246Fm, and 248Cm are compared
with previously reconstructed distributions. The multiplicity distributions of spontaneous fission neutrons of 250No, 256Rf, and 254Rf were
reconstructed for the first time. For each spectrum, the mean number of neutrons per decay and the dispersion of the distribution were obtained.
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D18-2021-5 (301.267)
Eganova I. A. et al.
Ad Disputandum: The Most Topical Scientific Ideas That Were Highlighted in Time
of Coronavirus Pandemic
It is indisputable that without a proper worldview, without a proper understanding of physical reality,
science is unable to provide a sustainable future on our planet. It is expedient and very timely for the authors
to submit judgment presented in this article of the deep essence of the main results, which form the foundations
of the scientific understanding of objective reality. Talk is about a really adequate model of space–time,
about a physical mechanism of global (terrestrial and cosmic) interactions and about the planet Earth as superorganism — a representative
of a special form of cosmic life.
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P4-2021-4 (460.524)
Efimov A. D., Izosimov I. N.
High-Spin States of Yrast-Bands Even Isotopes Pu, Cm, Fm, No
In some isotopes of Pu, Cm, Fm, No, the yrast-band
state energies are experimentally known up to the spin 32+, like this
holds in 248Cm. What is unique is that all the states of these superlong bands remain purely collective. Collectivity of the bands manifests itself
in the fact that the band state energies are reproduced with a high degree
of accuracy within the framework of the phenomenology of the IBM1. The
uncertainty of the model parameters is reduced under condition that the
depth of the deformation energy obtained on the basis of realistic
interactions was equal to the deformation energy depth in the internal
state, calculated with the found parameters of the IBM1 Hamiltonian.
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2021-3 (5.317.371)
Brief Review of Topmost Scientific Results Obtained in 2020 at the Joint Institute for Nuclear Research
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