A collimated beam of 14.1-Mev neutrons from the H 3 (0.8 and 1.6 Mev were excluded.At each telescope angle the scintillator pulse-height spectrum was observed between alpha-particle energies of 6 and 18 Mev. Background was measured by exposing a platinum blank to the telescope. The energy spectrum at zero and 15 degrees was peaked at its upper limit of 17 Mev and decreased to zero at about 10 Mev. Between 10 and six Mev, no alpha particles were observed. At larger angles, up to 115 degrees, yields were too low for significant spectrum determinations.The measured differential ...

New measurements of the differential elastic scattering cross sections of C, Al, Fe, Cu, Sn, Pb, and U for 14.5-Mev neutrons are reported. For Fe, Cu, Sn, and Pb the angular range from 5° to 150° was investigated with ±1° to db3° angular resolution. For the other elements a smaller angular range was investigated. Particular effort was devoted to the problem of discriminating against inelastically scattered neutrons and methods were developed which provided an experimental energy resolution of ^500 kev. Limited differential cross section data for inelastically scattered neutrons of energy greater than 9 Mev are also presented for Fe, Cu, Sn, and Pb.

No abstract

The inelastic collision cross sections of a number of elements for 14-Mev neutrons have been measured, using threshold detectors inside spherical shells of the scattering material. Reactions in copper, aluminum, and phosphorus with thresholds at approximately 11.5 Mev, 2.6 Mev, and 1.4 Mev were used as threshold detectors.

No abstract