Measurement of keV-Neutron Capture Cross Sections and Capture Gamma-Ray Spectra of 167 Er

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The neutron capture cross sections and capture γ-ray spectra of 167Er were measured in the neutron energy region of 10 to 90 keV and at 550 keV. Using a neutron time-of-flight method with a 1.5-ns pulsed neutron source by the 7Li(p, n)7Be reaction, the measurement was performed by detecting prompt γ rays from an enriched capture sample with a large anti-Compton NaI(Tl) spectrometer. A pulse-height weighting technique was applied to observed capture γ-ray pulse-height spectra to extract capture yields. The capture cross sections were derived with the error of about 5% by using the standard capture cross sections of 197Au. The present results were compared with the evaluated values of ENDF/B-VI and the previous measurement. The present measurement at 550 keV was the first one. The capture γ-ray spectra were obtained by unfolding the observed capture γ-ray pulse-height spectra. An anomalous shoulder was clearly observed around 3 MeV in the γ-ray spectra and the energy position of the shoulder was consistent with the systematics obtained in our previous work. The multiplicities of the observed γ rays were derived from the γ-ray spectra.
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