Toward a global exciton model; lessons at 14 MeV

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Abstract
The exciton model code PRECO-E and an associated set of global input parameters are being developed to allow the calculation of energy spectra and angular distributions from pre-equilibrium reactions without the use of adjustable parameters. Earlier detailed studies of primarily proton-induced reactions at 18-25 MeV and a quick look at a few 90 MeV reactions are here complimented with studies of primarily neutron-induced reactions at 14-15 MeV. These give information on the size of the n-n effective residual two-body matrix elements relative to their n-p and p-p counterparts and point to changes necessary in the handling of the equilibrium components. Changes made in the code and input set do not subtantially alter earlier agreement with data while improving agreement with 14 MeV data from the literature, including the relative yields in the inelastic and exchange channels. Indicated areas for future work are a study of surface effects in neutron-induced reactions and the inclusion of shell corrections in the equilibrium level-density parameter.

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