Cross Sections of the Reactions ⁵⁵Mn(n,2n)⁵⁴Mn, ⁵⁸Ni(n,2n)⁵⁷Ni and ⁵⁸Ni(n,np )⁵⁷Co Averaged over the U-235 Fission Neutron Spectrum

Abstract

Cross sections of ⁵⁵Mn(n,2n)⁵⁴Mn, ⁵⁸Ni(n,2n)⁵⁷Ni and ⁵⁸Ni(n,np)⁵⁷Co reactions are presented together with the 34 kinds of threshold reaction cross sections which have been measured earlier. The ⁵⁵Mn(n,2n) ⁵⁴Mn reaction cross section values are also used to give specific variance-covariance matrix of the 35 kinds of cross sections. The ⁵⁸Ni(n,np)⁵⁷Co reaction includes the (n,pn) and (n,d) reactions. The obtained experimental values are compared with those of experimental values of other authors, or with the values calculated by the Horibe’s formula, or with the integral values calculated with the cross section data in ENDF/B-V and JENDL-2, assuming the fission neutron spectrum shapes to be of Maxwell, or Madland-Nix, or Watt types.