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Abstract. Some fission yields data of JENDL FP Fission Yields Data File 2011 (JENDL/FPY-2011) revealed inadequacies when applied to delayed neutron related subjects. The sensitivity analyses of decay heat summation calculations also showed some problems. From these results the fission yields of JENDL/FPY-2011 have been revised. The present report describes the revision of the yield data by emphasizing the sensitivity analyses.

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The capture cross sections and capture-ray spectra of 91;92 Zr 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 7 Li(p,n) 7 Be reaction and with a large anti-Compton NaI(Tl) spectrometer. A pulse-height weighting technique was applied to observed capture-ray pulse-height spectra to obtain capture yields. Using the standard capture cross sections of 197 Au, the capture cross sections of 91;92 Zr 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 91 Zr were in agreement with the present results, but those for 92 Zr largely deviated from the present results. The capture-ray spectra of 91;92 Zr were obtained by unfolding the observed capture-ray pulse-height spectra. The multiplicities of observed rays were derived from the-ray spectra.

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