| F. Marie, A. Letourneau, G. Fioni, O. Deruelle, Ch. Veyssiere, H. Faust, P. Mutti, I. Al Mahamid, B. Muhammad |
In the framework of the Mini-INCA project, dedicated to the study of Minor Actinide transmutation process in high neutron fluxes, an $\\alpha$- and $\\gamma$-spectroscopy station has been developed and installed at the High Flux Reactor of the Laue-Langevin Institut. This set-up allows short irradiations as well as long irradiations in a high quasi-thermal neutron flux and post-irradiation spectroscopy analysis. It is well suited to measure precisely, in reference to ${}^{59}Co$ cross section, neutron capture cross sections, for all the Actinides, in the thermal energy region. The first measurements using this set-up were done on ${}^{243}Am$ and ${}^{242}Pu$ isotopes. Cross section values, at $E_n=0.025~eV$, were found to be $(81.8 \\pm 3.6)~b$ for ${}^{243}Am$ and $(22.5 \\pm 1.1)~b$ for ${}^{242}Pu$. These values differ from evaluated data libraries by a factor of 9 and 17\\%, respectively, but are compatible with the most recent measurements, validating by the way the experimental apparatus. |
