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Manuscript Title: CCFUS: a simplified coupled-channel code for calculation of fusion cross sections in heavy-ion reactions.
Authors: C.H. Dasso, S. Landowne
Program title: CCFUS
Catalogue identifier: AATM_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 46(1987)187
Programming language: Fortran.
Computer: VAX 8600, SPERRY 1100.
Operating system: VMS 4.4, H73/39R3B.
RAM: 10K words
Word size: 32
Keywords: Heavy ions, Cross sections-fusion, Multidimensional Low energy, Spin distributions, Barrier penetration, Reactions, Nuclear physics, Inelastic.
Classification: 17.7.

Nature of problem:
There are strong enhancements of the fusion rates in low-energy heavy ion collisions due to the couplings to other reaction channels. These couplings also modulate the distribution of angular momentum absorbed by the composite system at energies near the Coulomb barrier. The angular momentum distributions in turn are essential for describing the decay of the compound nuclei.

Solution method:
The various inelastic excitation and transfer reaction channels are treated as independent modes which couple to the initial ground state. The corresponding wave equations are approximately uncoupled by diagonalizing the interaction at the barrier. The total transmission probability is then obtained by summing over the distribution of transmission probabilities for the eigenbarriers, with weights given by the overlap of the initial state with the eigenchannels. The variation of the coupling interaction in the barrier region can be taken into account using a second-order expansion.

Running time:
A few cpu seconds.