Neutron cross-section sets were prepared for N, O, Al, Si, Fe, D, and Be for neutron energies from 0.037 eV to 18 MeV. The cross sections tabulated include the total, elastic, inelastic, (n,2n), and cross sections for charged particle emission. Information is also given on the angular distribution of elastically scattered neutrons and on the energy distribution of neutrons and gamma-rays following nonelastic reactions. (Author).

A set of neutron cross sections for Ti, K, Mg, and N were prepared for neutrons energies from 0.0253 ev to 18 Mev. A revision of some of the neutron cross sections for Al, Si, Na, and O given in NDA 2111-3, Vol. C, Nov. 1, 1959 and NDA 2133-4, Jan. 31, 1961 was made based on experimental results which appeared in the literature since the publication of these reports. In addition, some typographical errors in the tabulation (n, n) cross sections for Mn in NDA 2133-4 are corrected. The results of Hauser-Feshbach calculations of reactions of O-16 are reported. (Author).

The effect of fast-neutron (>1 Mev) irradiation on the mechanical properties of structural metals and alloys was studied. Although the yield strengths and ultimate tensile strengths are increased su stantially for most materials, the ductility suffers severe decreases. This report presents these changes in properties of several structural metals for a number of neutron exposures within the 1.0 x 10 to the 18th power to 5.0 x 10 to the 21st power n/sq cm range. Data summarizing these effects on several classes of materials such as carbon steels, low-alloy steels, stainless steels, Zr-base alloys, ni-base alloys, Al-base alloys, and Ta are given. Additional data which show the influence f irradiation temperatures and of post-irradiation annealing on the radiation-induced property changes are also given and discussed. Increases as great as 175% in yield strength, 100% in ultimate strength, and decreases of 80% in total elongation are reported for fast-neutron exposures as great as 5 10 to the 21st power n/sq cm. (Author).