Fast-neutron induced reaction cross section measurement of tin with dual monitor foils and covariance analysis

The fast-neutron induced elemental cross sections have been measured relative to the ^197 Au(n,2n) ^196 Au and ^27 Al(n, α ) ^24 Na monitor cross sections at 14.5 ± 0.2 MeV by using a natural Sn sample and the activation technique for production of ^111 Sn, ^117 Sn ^m , ^123 Sn ^m , ^111 In (cumulative), ^116 In ^m1+m2 , ^117 In ^m , ^117 In ^g (cumulative), and ^118 In ^m1+m2 . The off-diagonal weighted mean of the elemental cross sections were determined by constructing the covariance between the cross sections obtained with the two monitor cross sections. From the measured elemental cross sections, the respective isotopic cross sections were also determined for the ^112 Sn(n,2n) ^111 Sn, ^124 Sn(n,2n) ^123 Sn ^m , ^112 Sn(n,x) ^111 In and ^118 Sn(n,p) ^118 In ^m1+m2 reactions. The comparison of the measured elemental and isotopic cross sections with those in the EXFOR, JEFF-3.1/A, JENDL/AD-2017 and TENDL-2019 libraries as well as those predicted by TALYS-1.9 is discussed.