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Abstract. The neutron capture cross sections and capture gamma-ray spectra of Sn ( 116−119 Sn) and Gd ( 155−158 Gd) isotopes have been measured in the incident neutron energy region from 10 to 100 keV and at 550 keV. Pulsed keV neutrons were produced by the 7 Li(p,n) 7 Be reaction. Capture gamma rays were detected with a large anti-Compton NaI(Tl) spectrometer by means of a time-of-flight method. A pulse-height weighting technique was applied to the observed capture gamma-ray pulse-height spectra to obtain capture yields. Using the standard capture cross sections of 197 Au, the capture cross sections of the Sn and Gd isotopes were derived. The capture gamma-ray spectra were obtained by unfolding the observed capture gamma-ray pulse-height spectra. The present cross section results were compared with other experimental data and evaluated values.

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