Abstract
Surrogate reaction method is an important approach to overcome the difficulties meet in the direct measurement of neutron induced nuclear reaction. The current existing surrogate reactions generally employ the peripheral reactions such as inelastic excitation and transfer reaction where the involved angular momenta are much larger than the neutron capture reaction, which causes a difficulty in theoretical correction of spin of compound nucleus. We proposed to use capture reaction of light charged particle as the surrogate reaction, thus the spin distributions of compound nucleus in two reactions are quite similar and therefore the spin correction is not strongly desired. Based on this idea, the 239Pu(n, f) and (n, 2n) cross sections were successfully extracted by using 236U(α,, f) and (α, 2n) reactions as the surrogate reactions. The well coincidence of the present results with the data of ENDFB7 within the error bars shows the reliability of the proposed surrogate capture reaction method.
Highlights
Nuclear power today makes a significant contribution to electricity generation, providing about 10% of global electricity supply
For (n, 2n) reaction which plays an essential role in nuclear waste transmutation, the direct measurement is even harder due to the interference caused by the background neutrons from scattering and fission, etc
The basic principle is that the same compound nucleus (CN) "B" with the same excitation energy (Ex) can be formed by selecting a suitable reaction channel, based on the idea for the equilibrated compound nucleus that the formation phase is independent of the decay phase
Summary
Nuclear power today makes a significant contribution to electricity generation, providing about 10% of global electricity supply. For (n, 2n) reaction which plays an essential role in nuclear waste transmutation, the direct measurement is even harder due to the interference caused by the background neutrons from scattering and fission, etc. The surrogate reaction method (SRM) overcomes the difficulties meet in the direct measurement for the neutron induced reaction cross sections effectively. SRM refers to an indirect method which uses an surrogate reaction with a more experimentally accessible or preferable combination of projectile "d" and target "D" in measuring the target neutron "a" induced reaction cross sections,as shown in Figure 1 [1]. Σn f (En) and σC(En) are respectively the neutron induced fission cross section and the neutron capture cross section at the energy En, and Pe(tx,ppf )(En) is the experimental measured fission probability of the surrogate reaction at the corresponding neutron energy En, Pe(tx,ppf )(En) = N f /Np ,. Especially the blowout type development after 2000 [3][4], SRM has different forms like surrogate ratio method [3], surrogate capture reaction method and so on
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