Measurement of keV-Neutron Capture Cross Sections and Capture Gamma-Ray Spectra of ^<147, 148, 149, 150, 152, 154>Sm

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The neutron capture cross sections and capture γ-ray spectra of 147, 148, 149, 150, 152, 154Sm were measured in the neutron energy region of 10 to 90 keV and at 550 keV. A neutron time-of-flight method was adopted with a 1.5-ns pulsed neutron source by the 7Li(p, n)7Be reaction and with a large anti-Compton NaI(Tl) γ-ray spectrometer. A pulse-height weigthing technique was applied to observed capture γ-ray pulse-height spectra to derive capture yields. The capture cross sections were obtained 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 JENDL-3.2 and previous measurements. 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 of 150, 152, 154Sm, and the energy position of the shoulder was consistent with the systematics obtained in our previous work.
社団法人日本原子力学会の論文
1999-10-25