Contribution of real and virtual Pions to nuclear Photoabsorption at Intermediate Energies
M. -Th. Huett, A. I. Milstein, M. Schumacher
Abstract
The universal curve σ/A of nuclear photoabsorption is investigated within a Fermi gas model of nuclear matter. An energy range from pion threshold up to 400 MeV is considered. The interactions between nucleon, pion, Δ-isobar and photon are considered in the non-relativistic approximation with corrections of the order 1/M taken into account with respect to proton mass. Analytical expressions are obtained, in which the influence of nuclear correlations, two-nucleon contributions and relativistic corrections is studied explicitely. An extension of the model calculation to nucleon knock-out reactions is discussed.
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