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Zhuravlev, B.V; Lychagin, A.A; Titarenko, N.N; Demenkov, V.G; Trykova, V.I., E-mail: zhurav@ippe.ru
Third international workshop on compound nuclear reactions and related topics. Book of abstracts2012
Third international workshop on compound nuclear reactions and related topics. Book of abstracts2012
AbstractAbstract
[en] Level densities and their energy dependences for nuclei in the mass range 47≤A≤59 have been determined from the measurements of neutron evaporation spectra in (p,n) reaction. Knowledge of the level density values and their functional peculiarities is very important for the creation of consistent theoretical description of excited nucleus statistical properties and in making nuclear reaction cross-section calculations in the framework of statistical model. The general features of nuclear level density are known, but there are considerable uncertainties of its functional forms conditioned by the inhomogeneity of a single-particle state spectrum, residual interaction, effects of collective nature et al. The required accuracy of level density knowledge for nuclear cross-section calculation problems is approx. 10% in a wide range of excitation energy from 0.1 MeV to 20 MeV, and the existing data are often differed in 1.5 times. The experimental data on the nuclear level densities for many nuclei are derived, in the main, from the analyses of neutron resonance and low-lying level data. But this information is limited to rather narrow ranges of excitation energy and spin, and its extrapolation can lead to essential errors both in absolute value of nuclear level density and its energy dependence, especially, in transition field from well-identified discrete states to continuum part of excitation spectrum. Obviously, it is necessary to attract other experimental methods of nuclear level density determination with scope of more wide ranges of excitation energy and spin. One of the information sources on nuclear level density in a range between the discrete states and the neutron binding energy are the spectra of particles emitted in nuclear reactions. In this case the type of reaction and the energy of incident particles should be chosen so that the contribution of non-equilibrium processes was reduced to a minimum. These conditions are satisfied with the (p,n) reaction at proton energy up to 11 MeV. In the present work neutron spectra from (p,n) reaction on nuclei of 47Ti, 48Ti. 49Ti, 53Cr, 54Cr, 57Fe, 59Co have been measured at proton energies between 7 and 11 MeV. The measurements of neutron spectra were performed by time-of-flight fast neutron spectrometer on the pulsed tandem accelerator EGP-15 of IPPE. Analyses of the measured data have been carried out in the framework of statistical equilibrium and pre-equilibrium models of nuclear reactions. The calculations are done with use of the exact formalism of the statistical theory as given by Hauser-Feshbach with the generalized superfluid model of nucleus, the back-shifted Fermi-gas model and the composite formula of Gilbert-Cameron for nuclear level density. The nuclear level densities of 47V, 48V, 49V, 53Mn, 54Mn, 57Co, 59Ni and their energy dependences have been determined. The obtained results have been discussed in totality with existing experimental and model systematic data
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Faculty of Mathematics and Physics, Charles University, Prague (Czech Republic); 94 p; Sep 2012; p. 41; 3. international workshop on compound nuclear reactions and related topics; Prague (Czech Republic); 19-23 Sep 2011; GRANT 09-02-97515; Also available at: http://www-ucjf.troja.mff.cuni.cz/cnr11/cnr11_book_of_abstracts.pdf; The abstract in the publication is identical with that in this record
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CHROMIUM 53 TARGET, CHROMIUM 54 TARGET, COBALT 57, COBALT 59 TARGET, CROSS SECTIONS, ENERGY DEPENDENCE, ENERGY-LEVEL DENSITY, HAUSER-FESHBACH THEORY, IRON 57 TARGET, MANGANESE 53, MANGANESE 54, MEV RANGE 01-10, MEV RANGE 10-100, NEUTRON SPECTRA, NICKEL 59, PROTON REACTIONS, STATISTICAL MODELS, SUPERFLUID MODEL, TIME-OF-FLIGHT METHOD, TITANIUM 47 TARGET, TITANIUM 48 TARGET, TITANIUM 49 TARGET, VANADIUM 47, VANADIUM 48, VANADIUM 49
BARYON REACTIONS, BETA DECAY RADIOISOTOPES, BETA-PLUS DECAY RADIOISOTOPES, CHARGED-PARTICLE REACTIONS, COBALT ISOTOPES, DAYS LIVING RADIOISOTOPES, ELECTRON CAPTURE RADIOISOTOPES, ENERGY RANGE, EVEN-ODD NUCLEI, HADRON REACTIONS, INTERMEDIATE MASS NUCLEI, ISOTOPES, MANGANESE ISOTOPES, MATHEMATICAL MODELS, MEV RANGE, MINUTES LIVING RADIOISOTOPES, NICKEL ISOTOPES, NUCLEAR MODELS, NUCLEAR REACTIONS, NUCLEAR THEORY, NUCLEI, NUCLEON REACTIONS, ODD-EVEN NUCLEI, ODD-ODD NUCLEI, RADIOISOTOPES, SPECTRA, TARGETS, VANADIUM ISOTOPES, YEARS LIVING RADIOISOTOPES
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