Abstract
The double differential hybrid Monte Carlo simulation model (DDHMS) orig- inally used exciton model densities and transition densities with approximate angular dis- tributions obtained using linear momentum conservation. Because the model uses only the simplest transition rates, calculations using more complex approximations to these are still viable. We compare calculations using the original approximation to one using a nonrelativistic Fermi gas transition densities with the approximate angular distributions and with exact nonrelativistic and relativistic transition transition densities.
Highlights
The hybrid Monte Carlo simulation model[1] was proposed by Blann as a substitute for the exciton and hybrid preequilibrium reaction models, which depend on the overly strong hypothesis of equal a priori occupation of all n exciton states
The model was extended by Blann and Chadwick to calculate double differential spectra (DDHMS) using approximate expressions obtained from considerations of linear momentum conservation for the energy-dependent angular distributions of the particles and holes created.[4, 5]
The exciton model distributions were compared to the exact nonrelativistic Fermi gas ones in Ref. [6]
Summary
The hybrid Monte Carlo simulation model[1] was proposed by Blann as a substitute for the exciton and hybrid preequilibrium reaction models, which depend on the overly strong hypothesis of equal a priori occupation of all n exciton states. It provides a better approximation to the early stages of a preeequilibrium reaction than its predecessors.[2] The model was extended by Blann and Chadwick to calculate double differential spectra (DDHMS) using approximate expressions obtained from considerations of linear momentum conservation for the energy-dependent angular distributions of the particles and holes created.[4, 5] The simplest extension would be to substitute the exciton model densities and transition rates, based on spaced levels, with Fermi gas densities and transition rates that better reflect the nuclear single-particle density of states.
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