Measurements of the neutron emission spectra from spheres of N, O, W, 235U, 238U, and 239Pu, pulsed by 14-MeV neutrons

Inspired by new detector instrumentation that is insensitive to gamma-ray background and improved deuteron-beam bunching and sweeping of the ICT accelerator, we have measured the high-energy (2 less than E/sub n/ less than 15 MeV) neutron emission spectra from spherical targets of nitrogen, oxygen, tungsten, 235U, 238U, and 239Pu. The targets were pulsed at the center by a nominal 14-MeV neutron source at the LLL time-of-flight facility. The neutron source was obtained from the T(d,n)4He reaction with a pulsed 400-keV deuteron beam, produced by the LLL ICT accelerator. Collimated scintillation detectors at 260 and 1200 with respect to the deutron beam and at flight paths from 7.5-9.8 m recorded the neutron time-of-flight spectra