Abstract
In the context of improvement of nuclear data bases for future nuclear reactor researches, we study (n,xn) reactions experimentally with the help of the (n,xn γ ) technique. The experiments are performed at the GELINA facility which delivers a pulsed, white neutron beam. Several measurement campaigns have been performed on 235 U, 232 Th, 182,183,184,186 W and 238 U isotopes. A compilation of all these experimental cross sections (mostly still preliminary) compared to theoretical predictions will be discussed.
Highlights
Precise knowledge of (n,xn γ) reactions is a key issue in present day reactor development studies. the new Generation IV nuclear reactors explore new energy domains, and imply reaction rates unknown or badly known at this stage
Following the studies made by Salvatores et al [1] and A.Santamarina et al [2] this uncertainty impacts too strongly the accuracy of different core parameter calculations like the ke f f, the radial power distribution and the βe f f calculations of pressurized water and fast reactors
From the (n,xn γ) measurements the total (n,xn) cross section can be deduced since the total inelastic cross section is the sum of the cross section carried by all transitions that directly decay to the ground state
Summary
Precise knowledge of (n,xn γ) reactions is a key issue in present day reactor development studies. The new Generation IV nuclear reactors explore new energy domains, and imply reaction rates unknown or badly known at this stage. For the design of these new systems, the (n,xn) reactions have to be well described by simulation codes as they are an important energy loss mechanism and as they lead to neutron multiplication and production of radioactive isotopes. Following the studies made by Salvatores et al [1] and A.Santamarina et al [2] this uncertainty impacts too strongly the accuracy of different core parameter calculations like the ke f f , the radial power distribution and the βe f f calculations of pressurized water and fast reactors.
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