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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.
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P19-2026-6 (721. 554)
Agapov A.V. et al.
Comparison of the Frequency of Micronucleus Induction in A 549 Cells under the Action of X-Ray and Gamma Radiation
Experiments were carried out to obtain calibration curves of micronucleus induction in the A 549 cells depending on the dose of X-ray radiation at the
SARRP facility of the JINR Laboratory of Radiation Biology and to compare the results with previously obtained dose dependences at the “Rokus-M” gammatherapeutic
facility with the 60Co radioactive source. The possible reasons for the differences in the results obtained at the two installations are analyzed.
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P3-2026-5 (3.973.377)
Enik T. L. et al.
Direct Beam Boron Detector for Monitoring and Analyzing the Neutron Spectrum at the YuMO Small-Angle Spectrometer of the IBR-2 Reactor
This article discusses the direct beam detector of the YuMO spectrometer
(IBR-2, FLNP). Optimization and measurement results using a gas proportional
multiwire direct beam detector with a boron converter (10B4C) are presented.
Spectra obtained after a recent upgrade of this detector (converter replacement,
voltage optimization, etc.) are described.
The forward beam detector is used to measure the spectrum of neutrons
passing through a sample (obtaining the sample transmission function as a
function of neutron wavelength), as well as to adjust the collimation system and
the chopper operating window (synchronizing the chopper window closure to
suppress background neutrons). The detector is also used for data normalization
in measurements with samples having a high scattering or absorption crosssection.
As a result of the upgrade, the detector count rate has at least doubled. It is
shown that the neutron beam on the YuMO spectrometer is well collimated, the
detector is aligned, and the correct chopper phase is selected.
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E7-2026-3 (1. 414)
Isaev A.V. et al.
Prompt Neutron Emission in the Spontaneous Fission of 258,260Sg
An experimental study of 258,260Sg produced in the complete fusion reactions 207Pb + 52,54Cr was performed using the SHELS velocity filter.
Prompt neutron multiplicities in the spontaneous fission of 258,260Sg were measured for the first time, yielding average values of ν¯ (258Sg) = 4.9 ± 0.4 and ν¯ (260Sg) = 5.03 ± 0.14.
The α-decay branching ratio of 260Sg was determined to be bα = 0.29 ± 0.03. In addition, the half-lives were measured as T1/2(258Sg) = 2.2+2.4-1.0 ms (95% C.L., confidence limit)
and T1/2(260Sg) = 7.0+2,6-1.7 ms (95% C.L.).
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