Browsing by Author "Brooks, Frank"

Now showing 1 - 3 of 3
  • Thumbnail Image
    Item
    Open Access
    Differential cross section for neutron-proton radiative capture at En=63.4 MeV
    (1997) Allie, Muhammed Saalih; Brooks, Frank
    The angular distribution of photons from n-p radiative capture of 63.4 MeV neutrons has been measured using a new technique in which both the photon and the deuteron were detected simultaneously and the deuteron identified using pulse shape discrimination. Data taken at eight n-ϒ angles (45°-150°) were transformed to deuteron photodisintegration cross sections at the equivalent laboratory energy, Eᵧ = 33.9 MeV. The data were analysed in combination with independent measurements of the 0° and 180° cross sections. Legendre polynomial coefficients obtained from the analysis are consistent with other measurements in this energy range as well as with values reported from global fits. The measurements deviate marginally from predictions based on potential model calculations using the Bonn r-space and Paris potentials.
  • Thumbnail Image
    Item
    Open Access
    Neutron-neutron angular correlation in 252Cf spontaneous fission
    (1974) Pringle, John Stephen; Brooks, Frank
    The angular correlation between prompt neutrons emitted in 252 cf spontaneous fission has been measured. The observed correlation is compared with a theoretical calculation based on the evaporation model of neutron emission. It is found that the evaporation model is unable to account for the observed strong peaking in the n-n angular correlation at small angles. Preliminary calculations show that two of the proposed alternative neutron emission mechanisms, polar emission and "tidal wave" emission, may be able to account for the observed n-n angular correlation.
  • Thumbnail Image
    Item
    Open Access
    The response of organic scintillators to neutrons of energy 14-63 MeV
    (1991) Buffler, A; Brooks, Frank
    The response of a 5 cm (diameter) by 5 cm cylindrical NE213 liquid scintillator to neutrons has been measured as a function of neutron energy in the range 15-63 Me V, using time-of-flight to select neutron energy. The response function at each neutron energy was separated into components associated with the emission of different charged particles, identified by pulse · shape dissimilation to be protons, deuterons, and alphas, respectively. The response (light output) of NE213 to protons, deuterons and alphas was measured as a function of energy. Furthermore, total cross sections for neutron-induced proton, deuteron, and alpha production from 12C were determined from the charged particle yields. The simultaneous presence of n-p elastic scattering in the scintillator provided a reference for establishing an absolute cross section scale for the measurements. The results give information about reaction mechanisms and provide an improved basis for determining the neutron detection efficiency of the scintillator as a function of energy over this range.