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Manuscript Title: A nuclear optical model code for small computers.
Authors: R.J. Eastgate, W.J. Thompson, R.A. Hardekopf
Program title: OPTICS
Catalogue identifier: ABOU_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 5(1973)69
Programming language: Fortran.
Computer: HONEYWELL DDP 224.
Operating system: HASP VERSION 3.0.
RAM: 80K words
Word size: 8
Keywords: Nuclear physics, Optical model, Potential, Elastic scattering, Schrodinger equation, Spin-zero, Spin-half, Spin-one, Spin-orbit, Fox-goodwin, Coulomb, Compound-elastic, Scattering amplitudes, Phase shifts, Transmission coefficient, Angular distributions, Cross sections, Vector polarization Analysing power, Tensor polarization Analysing power.
Classification: 17.9.

Nature of problem:
OPTICS performs non-relativistic calculations of differential cross sections and vector and tensor polarization analysing powers for the elastic scattering of a particle of spin s=0, 1/2 or 1 from a particle whose spin is ignored. Scattering data are analysed in terms of an optical model potential including spin orbit coupling (for s=1/2, 1) and an optional compound-elastic cross section calculation. Coulomb wavefunctions are generated at two points exterior to the nuclear potential. Nuclear scattering wavefunctions are produced by outward iteration of the Schrodinger equation using method VII of Fox and Goodwin (also known as the Cowell and Numerov methods). Matching of these wavefunctions at the two points produces scattering anplitudes which are used to generate differential cross sections and polarization components and, if necessary, the transmission coefficients for the compound-elastic cross section calculation.

Restrictions:
Maximum projectile spin is 1; target spin is ignored. The only spin dependent potential is spin orbit. The maximum number of L-values is 30. The maximum number of radial mesh points is 200. The maximum number of experimental differential cross section points is 32. The maximum number of experimental differential polarization points is 32 (only one polarization component at a time for s=1). No program- controlled search facility.