Cross-Section Measurement for the Reaction ¹⁰³Rh(n,n')^103mRh

The excitation function for the reaction ¹⁰³Rh(n,n')^103mRh was measured by the activation technique from 0.2 to 6.1 MeV in 0.1-MeV steps and from 13.0 to 16.7 MeV in 1-MeV steps. This excitation function is normalized through an absolute measurement at 1.8 MeV. This measurement is based on n-p scattering for neutron flux determination and on liquid scintillation counting of ^103mRh separated from ¹⁰³Pd solutions for the activity determination. The total uncertainty of the cross-section results is typically ±5% above 0.5 MeV (about ±10% above 13 MeV). Concurrence with existing data is good except below 0.35 MeV, where the present results are considerably higher.