The Thermal-Neutron Activation Cross Sections and Resonance Integrals for ¹²⁸Te (n,γ) ^129gTe and ¹²⁸Te(n,γ)^129mTe

The thermal-neutron capture cross sections for the reactions ¹²⁸Te (n,γ) ^129gTe and ¹²⁸Te (n,γ) ^129mTe have been measured by a neutron activation method, using gold as a standard. Samples of powdered tellurium enriched to 96.5% in ¹²⁸Te were measured by gamma spectrometry. The found values are 199.7 ± 8 and 16.1 ± 0.7 mb, respectively. The resonance integrals have been calculated by irradiating tellurium and gold, or cobalt, with and without cadmium covers; their values are 1.48 ± 0.13 b and 77.4 ± 5.2 mb, respectively.