Browsing by Author "Moo, SP"

Now showing 1 - 3 of 3
  • Thumbnail Image
    Item
    Application of the pulsed neutron technique to fast metal systems
    (Australian Atomic Energy Commission, 1973-01) Moo, SP; Rainbow, MT; Ritchie, AIM
    The experimental apparatus and techniques which have been developed up to the end of 1971 at the AAEC Research Establishment at Lucas Heights to allow pulsed experiments to be performed in fast metal systems are described. The details of a metallic thorium assembly, the pulsed neutron source, timing systems and shielding and room return problems are discussed.
  • Thumbnail Image
    Item
    Time dependent 237Np, 235U and 239Pu fission rates in a thorium assembly during the interval 0 to 200 ns using a pulsed 9Be(d,n) source part I - experiment
    (Australian Atomic Energy Commission, 1973-03) Moo, SP; Rainbow, MT; Ritchie, AIM
    This paper describes a series of integral pulsed neutron experiments performed in a 0.4 x 0.4 x 0.4 m3 metallic thorium assembly in such a way as to allow direct comparison of space independent reaction rates with calculated reaction rates derived from a code which uses the asymptotic reactor theory approximation to describe leakage. The technique relies on the Fourier decomposition of measured space-time dependent reaction rates and the extraction from these of the reaction rate corresponding to the fundamental three-dimensional Fourier spatial mode. The reaction rates measured were the fission rates of 235U, 239Pu and 237Np following a short (~ 10 ns) burst of neutrons with a mean energy of ~ 2.7 MeV.
  • Thumbnail Image
    Item
    Time dependent 237Np, 235U and 239Pu fission rates in a thorium assembly during the interval 0 to 200 ns using a pulsed 9Be(d,n) source part II - theory
    (Australian Atomic Energy Commission, 1974-02) Moo, SP; Rainbow, MT; Ritchie, AIM
    Calculations are presented of the 237Np, 235U and 239Pu fundamental mode fission rates in a thorium assembly based on a diffusion theory code with a DB2 leakage term. Three different thorium cross section sets derived from the ABBN set, the UKNDL68 file and the ENDF/B-II file were used in the calculations and the results compared with each other and with experimental results reported previously. The sensitivity of the instantaneous decay constant of the fundamental mode to changes in partial cross sections is investigated.