  The production of heavy clusters in nuclear reactions is important in a wide
variety of applications: radiation shielding, space engineering and design,
medical physics, accelerator design, and more. According to the Cascade Exciton
Model (CEM), there are three ways high-energy heavy clusters can be produced.
The first way is via coalescence of nucleons produced in the IntraNuclear
Cascade (INC). The second way is via the preequilibrium model. The last way is
via Fermi breakup. Previous work in CEM examines the impact of expansions of
the preequilibrium model and Fermi breakup model on heavy cluster production.
The present work studies the impact of expanding the coalescence model on heavy
cluster spectra. CEM03.03, the default event generator in the Monte Carlo
N-Particle transport code version 6 (MCNP6) for intermediate-energy nuclear
reactions, is capable of producing light fragments up to He4 in its coalescence
model. In the present study, we have expanded the coalescence model to be able
to produce up to Be7. Preliminary results are promising.
