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 Au-197(n,2n)Au-196 and Al-27(n,alpha)Na-24 monitor cross sections at 14.5 +/- 0.2MeV by using a natural Sn sample and the activation technique for production of Sn-111, Sn-117(m), Sn-123(m), In-111 (cumulative), In-116(m1+m2), In-117(m), (117)Ing (cumulative), and In-118(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 Sn-112(n,2n)Sn-111, Sn-124(n,2n)Sn-123(m), Sn-112(n,x)In-111 and Sn-118(n,p)In-118(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.