Interference of the Low-Energy Neutrons on Activation Cross-Section Measurement of the ¹⁸⁶W(n, )¹⁸⁷W Reaction

Based on analyses of previous experimental methods and results, the cross sections of the ¹⁸⁶W(n, )¹⁸⁷W reaction were measured in the neutron energy range from 0.50 to 1.50 MeV by the activation technique. Neutrons were produced through the T(p,n)³He reaction, and the cross sections of the ¹⁹⁷Au(n, )¹⁹⁸Au reaction were used to determine the absolute neutron flux. Experimental results agreed with the previous time-of-flight measurements but did not agree with the previous activation measurements. Without the tungsten resonance absorption foils, the measured cross sections of the ¹⁸⁶W(n, )¹⁸⁷W reaction by the activation method were shown to be larger than the corrected ones because of the interference of the low-energy neutrons.