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Manuscript Title: Nuclear energy loss and scattering of ions penetrating thin layers of matter.
Authors: R. Skoog
Program title: NELAS
Catalogue identifier: AAUM_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 7(1974)392
Programming language: Fortran.
Computer: IBM 360/65.
Operating system: OS/360 MFT II, HASP.
RAM: 80K words
Word size: 32
Peripherals: magnetic tape.
Keywords: Nuclear physics, Energy loss, Scattering, Distribution, Thin layer, Monte carlo method.
Classification: 17.2.

Nature of problem:
NELAS calculates the nuclear (elastic) energy losses and scattering distributions of initially monoenergetic and perfectly collimated ions penetrating a thin layer of matter.

Solution method:
The distributions are obtained by Monte Carlo simulation using the reduced differential cross section in the form given by Lindhard and coworkers.

Restrictions:
The only assumptions made for the energy loss part of the calculation is that the collisions are perfectly elastic. The low energy and large thickness limits are determined by the restriction that the energy loss should be much smaller than the mean energy of the ions. The target has to be amorphous or very fine polycrystalline.

Running time:
Typical compile and running time is 70 s for step B, and 31 s plus 42 s for every 1000 ions run, when simulating a 4.0 mu g/cm squared (180 Angstrom carbon layer in stepA.