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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:53 |
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Conference: Bucharest University Faculty of Physics 2012 Meeting
Section: Nuclear and Elementary Particles Physics
Title:
Improvement of cross sections library for neutron activation analysis
Authors:
Iuliana Elena Visan, C.Roth
Affiliation:
Institute for Nuclear Research, Pitesti, Romania
E-mail
iuliana.visan@nuclear.ro
Keywords:
cross-sections,ENDF, NAA, CSAPE
Abstract:
The paper intends to present the results obtained by improvement of the cross section library for neutron activation analysis (NAA). A different procedure has been applied for neutron energy dependence of cross sections arising from the Evaluated Nuclear Data File libraries (available as free on the internet), for which the unsolved resonance region is given in a very fine energy mesh (up to tens of thousands points). For this purpose, the initial cross sections are collapsed assuming a 1/E neutron energy distribution for the resonance region but sensitivity studies regarding the influence of the deviation from the 1/E neutron energy distribution are also considered. The collapsing is such made the resonance cross section results are given in SAND-II resonance energy grid. The computations are performed by developing an own source-code written in MICROSOFT VISUAL BASIC and FORTRAN programming languages. The output data are then completed with rapid and thermal regions and processed with interpolation/extrapolation cross sections CSTAPE program which generates the cross section library files written in SAND-II energy grid (10^(-10) – 18 MeV on 621 energy groups).
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