Abstract
The exciton model of pre-equilibrium decay was originally formulated for the emission of nucleons, and the other kinds of ejectiles have been introduced afterward. However, clusters and gammas have not been yet treated simultaneously in competition. In connection with series of experiments using the ʼʼOslo methodʼʼ, we feel that such extension of calculations may be useful and we try to fill in this gap. To this aim, we employ the updated version of the Iwamoto-Harada-Bisplinghoff model.
Highlights
2.1 Iwamoto-Harada-Bisplinghoff model for cluster emissionPre-equilibrium model, formulated originally just for nucleon emission, has been extended to include emission of light clusters and γ quanta
For the specific case of α-particles, Bisplinghoff pointed out the importance of the binding energy of nucleons inside the cluster [3]
His approach was extended to other kinds of clusters and knock-out was incorporated [4, 5]
Summary
Pre-equilibrium model, formulated originally just for nucleon emission, has been extended to include emission of light clusters (up to the α-particle) and γ quanta. One of the principal requirements is the principle of microscopic reversibility applied to the emission rates and to the particle capture, and the other one is the necessity of reaching the compound nucleus theory as the limit (equilibrium) case of the pre-equilibrium emission when one goes to sufficiently long times. Both of them can be dealt relatively in the case of nucleon emission and with some additional approximation for cluster coalescence model in its pure version, where the Weisskopf-. It is rather complicated to say something a priori about the fraction of the knockout reactions fKO in the pre-equilibrium process, and we take it as a free parameter to be determined from the fit to the data
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