Average s- and p-Wave Resonance Parameters of ¹¹⁵In and ¹²⁷I

A study of the average s- and þ-wave resonance parameters of ¹¹⁵In and ¹²⁷I has been carried out by activation of samples in a ¹⁰B filtered beam of epithermal neutrons from a reactor. Neutron strength functions were obtained that are comparable to recent values obtained by total-cross-section studies but somewhat lower than earlier capture measurements. The s- and þ-wave neutron strength functions for ¹¹⁵In were found to be 0.09 ± 0.03 × 10⁻⁴ and 3.9 ± 1.4 × 10⁻⁴, respectively, and for ¹²⁷I, the corresponding values were found to be 0.42 × 10⁻⁴ and 0.83 ± 0.20 × 10⁻⁴. The average energy-dependent neutron cross sections from 1 to 100 keV were computed for both isotopes from the experimentally determined resonance parameters.