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We measured the ( n , 2 n ) cross sections for neutron energies from 13.7 to 15.1 MeV on  239 Pu and  241 Am by α- and γ-spectroscopy measurements of the post–irradiation  238 Pu/ 239 Pu and  240 Am/ 241 Am ratios relative to the ( n , 2 n ) cross sections of  196 Au and other calibration reactions. Statistical errors on the measurements were not more than a few percent. Cross–section values ranged from 228 to 214 millibarns for the reaction on  239 Pu and from 260 to 222 millibarns for the  241 Am reaction for neutron energies from 13.7 to 15.1 MeV.

239 Pu and 241 Am ( n , 2 n ) cross-section measurements near E n = 14 MeV