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Manuscript Title: MAXWEL: exact photon cross section processor for relativistic Maxwellian electrons.
Authors: B.L. Lathrop, B.R. Wienke
Program title: MAXWEL
Catalogue identifier: ACCF_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 32(1984)309
Programming language: Fortran.
Computer: CRAY-1.
Operating system: CTSS.
RAM: 116K words
Word size: 64
Keywords: Astrophysics, Radiative transfer, Photon cross sections, Klein-nishina formula, Photon-electron Scattering, Compton scattering, Transport radiation.
Classification: 1.3, 21.2.

Nature of problem:
A four dimensional, nested numerical integration of the Compton cross section folded over a relativistic Maxwellian electron background is treated by adaptive quadrature techniques. Various forms in the low energy, high and low temperature limits are recovered. Computed cross sections are of interest for discrete ordinates and Monte Carlo radiation transport applications in many areas of physics and engineering.

Solution method:
Nested 7-point Newton-Cotes adaptive quadrature routines are used to perform numerical integrations.


Running time:
Total and corresponding differential cross section computations (ten bins) require about 30 sec of Cray-1 time for a relative error of less than 10**-5.