Abstract
The effective cross section of the reaction 147Pm( n, γ) 148 g Pm has been measured for reactor neutrons. 197Au and 59Co monitors have been used to determine the 2200 m/sec neutron fluxes in the spectra employed, and cadmium ratio measurements for gold and the silver-cobalt activity ratio method have been used to determine the epithermal indices. The amounts of 148 g Pm formed, and the amounts of 147Pm from which they were formed, were both determined after purification of the irradiated material. γ-Spectrometry was used for the former purpose, and the 4πβ-γ tracer method, with 46Sc as the tracer, was used for the latter. The cross section of the reaction for Maxwellian neutrons ( σ 0 g) and its reduced resonance integral (Σ′) were found to be 96·0 ± 1·8 barns ( T = 60°C) and 1274 ± 66 barns respectively.
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