Neutron capture gamma rays were measured for all stable Se isotopes in an incident neutron energy region from 15 to 100 keV. A neutron time‐of‐flight method was adopted with a ns‐pulsed neutron source based on the 7Li(p,n)7Be reaction and with a large anti‐Compton NaI(Tl) spectrometer. A pulse‐height weighting technique was applied to the observed capture gamma‐ray pulse‐height spectra to obtain the capture yields. Using the standard capture cross sections of 197Au, the capture cross sections of stable Se isotopes were derived with an error of about 5%. The capture gamma‐ray spectra were obtained by unfolding the observed capture gamma‐ray pulse‐height spectra. The present results for the capture cross sections are compared with the previous measurements and the evaluations of JENDL‐3.3 and ENDF/B‐VI.8 and VII.0.
