Measurement of keV-Neutron Capture Cross Sections and Capture Gamma-Ray Spectra of ^<91, 92>Zr

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The capture cross sections and capture γ-ray spectra of 91,92Zr were measured in an incident neutron energy region from 15 to 100 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) spectrometer. A pulse-height weighting technique was applied to observed capture γ-ray pulse-height spectra to obtain capture yields. Using the standard capture cross sections of 197Au, the capture cross sections of 91,92Zr were derived with the errors from 5 to 9%. The present results were compared with other measurements and the evaluated values in JENDL-3.3 and ENDF/B-VI. The JENDL-3.3 evaluations for 91Zr were in agreement with the present results, but those for 92Zr largely deviated from the present results. The capture γ-ray spectra of 91,92Zr were obtained by unfolding the observed capture γ-ray pulse-height spectra. The multiplicities of observed γ rays were derived from the γ-ray spectra.
一般社団法人日本原子力学会の論文
2005-04-25