Neutrino - Nucleus Reaction Cross Sections at Low and Intermediate Energies

Neutrino-nucleus reactions at low and intermediate energies up to Ev=500 MeV are investigated for the most interesting nuclei from an experimental point of view. We mainly focus on calculations of neutrino-nucleus cross sections for semi-inclusive processes, for which recent measurements from radiochemical experiments at LAMPF and KARMEN have been obtained. Inclusive cross sections are also calculated and discussed. The method employed uses the Lindhard function for the description of the particle-hole excitations of the final nucleus via a local density approximation.

CALCULATION OF DYNAMICAL MAGNETIC SUSCEPTIBILITIES OF TRANSITION METAL ELEMENTS AND ORDERED COMPOUNDS

The dynamical magnetic susceptibility χ(q, ω) may be modelled in terms of a band Lindhard function χo(q, ω) and a generalised molecular field parameter λ(q, ω). Comparison of χo(q, ω) calculated within density functional theory and information on χ(q, ω) inferred from neutron scattering data in nearly magnetic metals suggests that at low temperatures it is possible to understand the main features of χ(q, ω) at small ω near the ordering wavevector in terms of the Lindhard function and a qand ω independent molecular field parameter.