Abstract
SOFIA (Studies On Fission with Aladin) is a new experimental set-up dedicated to accurate measurement of fission-fragments isotopic yields. It is located at GSI, the only place to use inverse kinematics at relativistic energies in order to study the (gamma,f) electromagnetic-induced fission. The SOFIA set-up is a large-acceptance magnetic spectrometer, which allows to fully identify both fission fragments in coincidence on the whole fission-fragment range. This paper will report on fission yields obtained in U-234,U-235,U-236,U-238(gamma,f) reactions.
Highlights
Data on fission-fragment yields are still up to now incomplete and often inaccurate despite decades of advanced investigations
This lack of high-resolution data constitutes an obstacle to the development of predictive and reliable models, and yet, accurate yields data of isotopic fission fragments are crucial for nuclear-reactor applications, to simulate the nuclear fuel burn-up associated with the accumulation of fission products in the core, the neutron flux, or, the decay heat after a core shutdown
The isotopic identification was obtained for both fission fragments in coincidence and for a large range of fissioning nuclei
Summary
Data on fission-fragment yields are still up to now incomplete and often inaccurate despite decades of advanced investigations. Even for the most studied reaction, i.e., thermal-neutron-induced fission of 235U, uncertainties attached to isotopic fission yields are mainly above 30 % [1]. This lack of high-resolution data constitutes an obstacle to the development of predictive and reliable models, and yet, accurate yields data of isotopic fission fragments are crucial for nuclear-reactor applications, to simulate the nuclear fuel burn-up associated with the accumulation of fission products in the core, the neutron flux, or, the decay heat after a core shutdown.
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