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Manuscript Title: A finite range coupled channel Born approximation code.
Authors: P. Nagel, R.D. Koshel
Program title: FRCCBAOUKID
Catalogue identifier: ABPI_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 15(1978)193
Programming language: Fortran.
Computer: CDC 6600/CYBER 74.
Operating system: CDC-KRONOS.
Program overlaid: yes
RAM: 75K words
Word size: 60
Peripherals: disc.
Keywords: Nuclear physics, Finite range, Plane wave expansion, Coupled channel, Direct reaction, Born approximation.
Classification: 17.11.

Nature of problem:
The computer code OUKID calculates differential cross sections for direct transfer nuclear reactions in which multistep processes, arising from strongly coupled inelastic states in both the target and residual nuclei, are possible. The code is designed for heavy ion reactions where full finite range and recoil effects are important.

Solution method:
Distorted wave functions for the elastic and inelastic scattering are calculated by solving sets of coupled differential equations using a Matrix Numerov integration procedure. These wave functions are then expanded into bases of spherical Bessel functions by the plane-wave expansion method. This approach allows the six-dimensional integrals for the transition amplitude to be reduced to products of two one- dimensional integrals. Thus, the inelastic scattering is treated in a coupled channel formalism while the transfer process is treated in a finite range born approximation formalism.

Restrictions:
(1) No more than three states can be coupled in each the target and the residual nucleus.
(2) The projectile and the target nuclei cannot be simultaneously excited.
(3) The wave number for the relative kinetic energy should be less than 5 fm**-1.
(4) No more than 90 partial waves are allowed.
(5) Coulomb excitation is not included.
(6) The transferred particle is assumed to be a cluster with no internal structure.