Moments Calculations of the Fermi Age in Moderators and Moderator—Metal Mixtures

Essentially exact calculations of the Fermi age in the pure moderators and in moderator-metal mixtures have been performed by computing the first few moments of the slowing-down distribution. The treatment of energy degradation takes into account the anisotropy of the elastic scattering to sixth order in a Legendre expansion, using data not previously available. Energy degradation through inelastic and (n, 2n) processes is explicitly included.