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Pa(n,f) (MP) old DD

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  • The experiment was carried out at the tandem accelerator of IPN Orsay. We could successfully determine the fission probability for the 234Pa* nucleus in the fast neutron energy range (0.5-10 MeV). This probability, multiplied by the cross-section for the formation of compound nucleus (233Pa+n —> 234Pa*) calculated with the help of optical model leads to the cross-section for the reaction 233Pa(n,f).

  • It is worth noting that we validated the employed method
    calculated cross-section for formation of compound nucleus multiplied by the fission probability measured in the transfer reaction
    in the case of compound nuclei 232Pa and 231Th, by comparing the fission cross-sections deducted from the reactions 232Th(3He,t)232Pa and 232Th(3He,α)231Th with the directly measured ones 231Pa(n,f) et 230Th(n,f) obtained by other authors.

Picture of experimental setup.

The charged particles that sign the formed nucleus were identified with two E-ΔE telescopes, fission products were detected with fifteen photovoltaic cells. The 232Th target was placed in the center of the reaction chamber.

The experiment and the results are presented in M. Petit et al..

Related publications:

Mesure de la section efficace de fission du 233Pa
M. Petit, PhD, Université Bordeaux 1, Oct 2002
Neutron induced fission cross section of 233Pa via the surrogate method
M. Petit et al., Nuclear Physics A 735, 345 (2004)