Preprints and Communications
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Brief Review of Topmost Scientific Results Obtained in 2016 at the Joint Institute for Nuclear Research
Pepelyshev Yu. N., Tsogtsaikhan Ts.
Investigation of the Dynamics of Pulse Energy Noise at the IBR-2M
Reactor in the Fuel Burnup
In this paper, we present the results of a study on pulse energy noise
dynamics of the IBR-2M in the fuel burnup for a significant period of the
reactor operation, starting from the date of its commissioning in
2011 and until the end of 2016. It is shown that the pulse energy noise
during operation of the IBR-2M with burnup to about
∼1100 MW·day changes significantly by both the spectral component and the level. The
standard deviation of the random power fluctuations did not exceed 5% and
was less than allowable. In addition, the low level of low-frequency
noise (∼1,6%) indicates the absence of sign of
vibrational instability of the reactor and a substantial margin of burnup
Koltovaya N. et al.
Kinetics of Gene and Chromosome Mutations Induced by UV-C in Yeast Saccharomyces cerevisiae
The systematic study of the kinetics of UV-induced gene and structural mutations in eukaryotic cells was carried out on the basis
of model yeast S. cerevisiae. A variety of genetic assays (all types of base pair substitutions, frameshifts, forward mutations
canl, chromosomal and plasmid rearrangements) in haploid strains were used. Yeast cells were treated by UV-C light of fluence of energy
up to 200 J/m2. The kinetics of the induced gene and structural mutations is represented
by a linear-quadratic and exponential functions. The slope of curves in log-log plots was not constant,
had the value 2-4 and depended on the interval of doses. It was suggested that it is the superposition
and dynamics of different pathways form the mutagenic responses of eukaryotic cells to UV-C light that cause the high-order curves.
Aksenov V. L.
A 15-year Forward Look at Neutron Facilities in JINR
The service life of the IBR-2 reactor, one of the leading pulse neutron
sources in the world, is expected to end in 2032. Modern trends in sciences
where neutrons are used, possible variants of a concept for a new neutron
source and its potential position in the world neutron landscape are
discussed. The flagship experiments for a new neutron source in the fields
of condensed matter research, fundamental and nuclear physics are proposed.