Investigation of fast neutron reactions in natural lutetium

The cross-sections and isomeric ratios of the cross-sections for the reaction ¹⁷⁶Lu(n,γ)${}^{177m,g}$Lu were obtained for the first time on a base of experimental and evaluated data with the MCNP simulation of scattered neutron spectra. The cross-sections of the reactions ¹⁷⁵Lu(n,p)¹⁷⁵Yb, ¹⁷⁵Lu(n,α)¹⁷²Tm, and ¹⁷⁶Lu(n,α)¹⁷³Tm were precised at a neutron energy of 14.6±0.3 MeV and used for checking up our cross section determination procedure. The account of scattered neutrons to the nuclear reaction was estimated with the MCNP 4c code and TALYS-1.96, EMPIRE 3.2.3 codes calculations. Even with a proper consideration of scattered neutrom spectra, the ¹⁷⁶Lu(n,γ)${}^{177m,g}$Lu reaction cross section appeared rather greater than the calculations with the TALYS, EMPIRE codes and evaluations within the ENDF/B-VIII.0, TENLD-2021, JEFF-3 data bases and libraries.