ABOUT ATTESTATION OF REFERENCE DATA AND CONSTANTS BY INTERDEPARTMENT
COMMITY ON THE ATTESTATION OF THE REFERENCE DATA AND CONSTANTS FOR
VARIOUS DIRECTIONS OF ATOMIC SCIENCE AND TECHNOLOGY
T.V.Golashvili, A.A.Lbov
ЦНИИАТОМИНФОРМ, МИНАТОМ РФ
This article contains the information about organization of the Interdepartment Commity on the attestation
of the reference data and constants for various directions of atomic science and technology of Russian
Federation Minestry on atomic energy and about order attestation of this data and also the list of data
attestated by this Commity from November 1994 up to the present time as recommended reference data.
SYSTEMATIC MEASUREMENT OF ACTIVATION CROSS SECTIONS AT NEUTRON
ENERGY OF 13.4-14.9 MeV
A.A.Filatenkov, S.V.Chuvaev, V.N.Aksenov, V.A.Yakovlev
Радиевый институт им. В.Г.Хлопина, Санкт-Петербург
The results of measurement of activation cross sections for 60 reactions of importance for fusion and
applications are presented.
GAMMA-RAY PRODUCTION CROSS-SECTION BY INTERACTION OF 13.8 MeV NEUTRONS
WITH Cu, W, AND 235U NUCLEI
V.M.Gorbachev, V.I.Nagorny, Yu.Ya.Nefedov, A.M.Shvetsov, M.S.Shvrtsov
Российский Федеральный ядерный центр Всероссийский научно-исследовательский институт экспериментальной физики,
г. Саров
Gamma-ray production cross-sections have been measured for Cu, W and 235U at the incident 13.8 MeV
neutrons energy. Differential cross-sections are given as a function of gamma-ray energy over the region
from 0.5 to 10.0 MeV for the angle between the incident neutrons and the emitted protons of 125°. The
measurements were carried out with the use of time-of-flight method and of the spectrometer with big
NaI(Tl) crystal. The data were corrected on multiple scattering of neutrons and gamma-rays in a sample.
Integral cross-sections errors make up not more than ±10% P=0.95. The differential cross-sections errors
are, mainly, in the limits of ±(15-30)% P=0.95. The results are compared with the results of the other
authors.
CROSS SECTION OF THE FORMATION OF GAMMA RAYS FROM NEUTRON INELASTIC
SCATTERING OF ENERGY 3.0 MEV
A.I.Lashuk, I.P.Sadokhin
Государственный Научный Центр РФ - Физико-энергетический институт, Обнинск
Measurements of the gamma rays existed by neutron inelastic scattering on Na, Si, Al, Cr, Zr, Nb, Mo, Cd,
W, Pb and Bi have been carried out by use of the conventional ring and disk scatterer geometry from a
neutron energy 3 MeV. A NaI scintillation spectrometer has been used to observe gamma rays. In most
cases these gamma rays can be fitted into known level schemes of the target nuclides.
THE MEASUREMENTS UF 117Sn RESONANCE PARAMETERS IN THE ENERGY RANGE 405000 eV
G.P.Georgiev, H.Fajkov-Stanchik,
Объединенный институт ядерных исследовяний, г.Дубна
Yu.V.Grigor’ev,
Государственный научный центр - Физико-энергетический институт., г.Обнннск
G.V.Muradyan,
Российский научный центр "Курчатовский институт", г. Москва
N.V.Yaneva
Институт ядерных исследований и ядерной энергетики, г. София
The neutron radiative capture measurements for enriched isotope 117Sn are performed at the neutron
spectrometer LNPh JINR by a gamma-rays multiplicity method using the multi.sectional 4-detector
"Romashka" placed on the 500 m flight path of the IBR-30 booster. The gamma-multiplicity spectra of
resolved rcsonances were obtained in the energy range from 40 eV to 5000 eV. The mean gamma-ray.s
multiplicity was determined the energy, the average multiplicity, the spin and the radiative width for each
resonance.
THE DEFlNITION OF SPINS OF INDIUM ISOTOPES BY MEANS OF GAMMA-LINE
INTENSITIES
Yu.V.Grigor’ev,
Государственный научный цнтр - Физико-энергетический институт, г. Обнинск
G.P.Georgiev, N.A.Gundorin, H.Fajkov-Stanchik, Hen Syn Ho
Объединенный институт ядерных исследований, г.Дубна
N.V.Yaneva
Институт ядерных исследований и ядерной энергетики, г. София
Gamma rays in the range 150-1500 keV have been studied for s-wave neutron ressonancess of 113In and
115
In, selected by time of flight in the range 1-100 eV. The measurement were carried out at the pulsed
neutron booster IBR-30 of JINR in Dubna on the 60 m flight path. The spins for 6 resonances of 115In have
been assigned by measuring intensity variation of some strong low-energy transitions. On the base of the
previous experiment statements we determined the spins torn the ratios between the intensities of the
transitions at 273 keV and 186 keV and of the triplet at 171175 keV. In the case 113In we chose under
consideration the ratios line intensity at 307 keV, 287.4 keV and 341 keV. In this way the information on
the spins for eight resonances of 113In was obtained for the first time.
SOME CRITERIA FOR SELECTION OF EVALUATED THRESHOLD REACTION
EXCITATION FUNCTIONS
V.N. Manokhin
Institute of Physics and Power Engineering, Obninsk, Russia
Some empirical systematics of excitation function shapes and cross sections of neutron induced threshold
reactions at the maximum of excitation functions are described.
ON POSSIBLE CONTRIBUTION OF KNOCKOUT PROCESS AND INELASTIC SCATTERING
WITH EXCITATION OF ANOMALY PARITY STATES IN NEUTRON EMISSION SPECTRA
V.P.Lunev, V,G,Pronyaev, S.P.Simakov
Institute of Physics and Power Engineering, Obninsk, Russia
In the framework of semi-microscopical approach, based on shell model for description of transitional
densities for states, distorted waves for incoming and outgoing particles and consistent effective interaction,
the contribution of the knockout process and inelastic scattering with excitation of anomaly parity states into
neutron emission spectra are evaluated. The calculations were done for 26 MeV neutrons induced on 93Nb
and 209Bi and results of calculations added by contribution of other reaction mechanisms were compared
with existing experimental data. Although, the account of these two new reaction mechanisms improves the
description of experimental data, the obtained quantitative results due to used approximations are
preliminary. More accurate calculations which do not apply some approximations of these work are
required.
DEPENDENCE OF THE TOTAL NEUTRON CROSS SECTIONS FOR EVEN-EVEN NUCLEI 112124
Sn AT LOW ENERGIES ON THE MASS NUMBER
D.A.Zaikin, M.V.Mordovskoy, I.V.Surkova
ГНЦ " Институт ядерных исследований РАН"
Low energy neutron total cross sections for the tin even isotopes with A=112-124 are analysed in the
framework of the two-phonon version of the coupled channel optical model. A unified description of these
cross sections has been obtained. Results of this analysis give an evidence in favour of the assumption that
the neutron number N=64 is a magic one, i.e. 114Sn is a twice magic nucleus.
HELIUM PRODUCTION NEUTRON CROSS SECTION DATA LIBRARY
K.I.Zolotarev, V.N.Manokhin, A.B.Pashchenko*), M.V.Scripova
Institute of Physics and Power Engineering, Obninsk
*) International Atomic Energy Agency, Vienna, Austria
A knowledge of neutron-induced He-3 and He-4 production reaction cross sections for neutron energies up
to 20 MeV is of considerable importance both for present day fission reactors and future fusion reactors.
The data are needed for various calculations concerning the prediction of helium gas production in
structural materials. In the Russian Nuclear Data Center in cooperation with the IAEA Nuclear Data Section
the Library of neutron induced helium production cross sections was formed. The library contains evaluated
data for total helium production cross sections and excitation functions of (n,), (n,n'), (n,He3) reactions
and some other helium production partial reactions for 29 elements and their isotopes. Evaluation were
performed on the basis of experimental data, theoretical model calculations and newly developed
systematics for (n,) reaction.
EFFECTS OF TRANSPORT APPROXIMATION IN REACTIVITY COEFFICIENTS IN LARGE
FAST REACTOR WITH SODIUM PLENUM
V.A.Grabezhnoy, A.V.Danilychev, D.G.Elistratov, V.A.Korneev, V.V.Korobejnikov, V.Yu.Stogov
Institute of Physics and Power Engineering, Obninsk
The corrections contribution to the main reactivity coefficients are studied, in the reactor being optimized
according to maximum safety and self-protection conditions going over from diffusion approximation to
transport one. It is shown that Fuck's law using for gradient elements in the calculations of material
efficiencies on the common boundary (core/sodium plenum), which characterized sharply different
neutron-physical characteristics, give sufficiently strong error. The values of calculation corrections
introduction for the calculation of reactivity components, connecting with temperature expansion of core
materials, including space distribution of given corrections for accident processes, increase the calculation
degree of reactor self-protections.
HALF-LIVES OF RADIONUCLIDES USED FOR CALIBRATION OF X-RAY AND GAMMARAY DETECTORS
V.P.Chechev
Радиевый институт им. В.Г.Хлопина, Санкт-Петербург
The evaluated values of half-lives for the 42 radionuclides are presented. They have obtained using
experimental data published up to 1995. The evaluation technique is considered. The obtained results are
affirmed as national recommended reference data.
PROTON OPTICAL POTENTIAL FOR 90Zr NUCLEUS NEAR THE COULOMB BARRIER
A.F.Gurbich, N.N.Titarenko
Institute of Physics and Power Engineering, Obninsk
The differential cross-sections have been measured for the elastic proton scattering from 90Zr in the energy
range of 5,6 - 9,0 MeV for the angles in the interval of 40°-165°. The analysis of data have been performed
in frameworks of the optical and statistical models. The peculiarities of the low energy behaviour of the
proton optical potential are discussed.