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Fission 233Pa(n,f)

  • The experiment was carried out at the tandem accelerator of IPN Orsay. We could successfully determine the fission probability for the ^{234}Pa* nucleus in the fast neutron energy range (0.5-10 MeV). This probability, multiplied by the cross-section for the formation of compound nucleus (^{233}Pa+n —> ^{234}Pa*) calculated with the help of optical model leads to the cross-section for the reaction ^{233}Pa(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 ^{232} Pa and ^{231}Th, by comparing the fission cross-sections deducted from the reactions ^{232} Th(^{3}He,t)^{232}Pa and ^{232}Th(^{3}He,^{4 He)^{231}Th with the directly measured ones ^{231}Pa(n,f) et ^{230}Th(n,f) obtained by other authors.

Picture of experimental setup.

The charged particles that sign the formed nucleus were identified with 2 telescopes E-ΔE, fission products were detected with 15 photovoltaic cells. The ^{232}Th target was placed in the center of the reaction chamber. Our results compared with available databases are reported in the publication (Nuclear Physics A 735 (2004) 345).