High-accuracy 233U(n, f ) cross-section measurement at the white-neutron source n TOF from near-thermal to 1 MeV neutron energy
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Document typeArticle
Defense date2009-10-08
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Abstract
The 233U(n,f ) cross section has been measured at the white neutron source n TOF in a wide energy range with
a dedicated fission ionization chamber. We report here the results from ∼30 meV to 1 MeV neutron energy. The
233U(n,f ) cross section has been determined relative to a reference sample of 235U(n,f )measured simultaneously
with the same detector. The very high instantaneous neutron flux and the intrinsically low background of the
n TOF installation result in an accuracy around 3% in the whole energy range, while the energy resolution of the
neutron beam allows for an accurate description of the fission cross section by means of R-matrix analysis over a
wide energy range. The results are, in general, in good agreementwith the most recent high-accuracy measurement
of this fission cross section, over the more limited range of the previous measurements, and indicated that even
the latest evaluations underestimate the cross section in the epithermal region. The present high-quality data
provide the basis for a more precise evaluation of the 233U fission cross section and for improving the reliability
of databases needed for the design of new energy systems based on the Th/U cycle.
CitationCalviani, M. [et al.]. High-accuracy 233U(n, f ) cross-section measurement at the white-neutron source n TOF from near-thermal to 1 MeV neutron energy. "Physical review C", 08 Octubre 2009, vol. 80, p. 044604-1-044604-11.
ISSN0556-2813
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