Study of the (n,γf) process on ²³⁹Pu

In the neutron resonance range, fission cross section of ²³⁹Pu can be seen as a sum of the immediate (n,f) and the two-step (n,γf) fission reactions. In that case, five channel widths should be considered for a proper evaluation, those are: two opened fission channels for J^π = 0⁺, one opened fission channel for J^π=1⁺ and two J-dependent for the (n,γf) reaction. The sizeable contribution of the (n,γf) process should have an impact on the determination of the capture and fission widths involved in the Reich-Moore approximation of the R-matrix theory. The present work aims to investigate this impact by using the CONRAD code and the Γ_γ-f available from literature. Prompt neutron multiplicity (ν_p) has been also reproduced including the contributions of the (n,γf) process. (authors)