Measurement and Evaluation of the Activation Resonance Integral of 146Nd, 148Nd, and 150Nd

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Abstract
Values of the ratio of the reduced activition resonance integral to the thermal cross section, I′/σ0, of 146Nd, 148Nd, and 150Nd were determined relative to gold by measuring cadmium ratios. A lithium-drifted germanium gamma-ray spectrometer was used to resolve the activities of the irradiated samples. The results are: for 146Nd I′/σ0 = 1.42 ± 0.10 and with an assumed σ0 = 1.4 b, I′ = 1.99 ± 0.20 b; for 148Nd I′/σ0 = 4.22 ± 0.14 and with an assumed σ0 = 2.5 b, I′ = 10.5 ± 0.9 b; and for 150Nd I′/σ0 = 13.7 ± 0.8 and with an assumed σ0 = 1.2 b, I′ = 16.4 ± 2.8 b.The resolved and unresolved epithermal integrals of 146Nd, 148Nd, and 150Nd were calculated. Values of the spectral correction factor were also calculated, so the resonance integral could be obtained from the epithermal integral data measured in our reactor spectrum in this experiment. Epithermal integral and spectral correction factors are listed in the text.The most important result of this investigation is that the 148Nd activation reduced resonance integral is about half of the previously recommended value and consequently the radiative width for 148Nd is also about half of the previously accepted value.

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