Abstract
Comparisons of calculated neutron yield distributions from $\ensuremath{\alpha}$-particle induced reactions on thick targets are made with measured data to analyze the initial reaction process in the framework of the exciton (hybrid) model code ALICE91 (M. Blann, Lawrence Livermore National Laboratory Report UCID 19614, 1982). We have considered two reaction mechanisms: dissolution of the $\ensuremath{\alpha}$ in the nuclear field, and preequilibrium processes initiated by $\ensuremath{\alpha}$-nucleon collisions. Both these processes seem to contribute to the emitted neutron spectra in varying proportions depending on the incident $\ensuremath{\alpha}$ energy and possibly on the target nucleus. Contributions from other processes appear to be non-negligible.
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