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Manuscript Title: NLOM: a program for nonlocal optical model calculations.
Authors: B.T. Kim, M.C. Kyum, S.W. Hong, M.H. Park, T. Udagawa
Program title: NLOM
Catalogue identifier: ACHU_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 71(1992)150
Programming language: Fortran.
Computer: VAX 11/750.
Operating system: VAX/VMS, UNICOS, SUN OS 4.1, MS-DOS 4.01.
RAM: 14K words
Word size: 32
Keywords: Nuclear physics, Nonlocal, Optical model, Lanczos method, Elastic scattering Cross section, Partial wave phase shift, Partial wave s-matrix.
Classification: 17.9.

Nature of problem:
It calculates the elastic scattering cross sections of a projectile (either a nucleus or a nucleon) with spin, 0 or 1/2 scattered by a non- local potential on the basis of the optical model.

Solution method:
It follows a method developed by Kim and Udagawa which utilizes the Lanczos technique for solving integral equations derived from the non- local Schrodinger equation.

Restrictions:
The problem deals with any nonlocal potentials as an input. It generates a Gaussian type nonlocal potential by itself. The maximum number of iterations, partial waves, radial mesh points, and angles for angular distributions are currently limited to MI=20, ML=50, MX=200 and MA=100, respectively, in PARAMETER statements. These restrictions can be modified by redefining MI, ML, MX and MA in the PARAMETER statements as desired. The total array size required for this program is roughly (30*ML+2*(MX+MI)**2).

Running time:
The amount of time required depends upon the number of partial waves and iterations given in the input card 3. The running time for one partial wave and 5 iterations in test runs on the VAX 11/750 is about 9 seconds.