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Manuscript Title: Bremsstrahlung cross section for a point, spinless target.
Authors: A. Minter, D.A. Jenkins
Program title: BREMPNT
Catalogue identifier: ABRV_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 59(1990)499
Programming language: Fortran.
Computer: VAX 8800.
Operating system: VMS V5.1-1.
Word size: 32
Keywords: Radiation, Bremsstrahlung, Spinless, Relativistic, Atomic physics, Spectra, Cross section, Point target.
Classification: 2.2, 21.1.

Nature of problem:
The differential cross section for bremsstrahlung was originally calculated by Bethe and Heitler. The Bethe-Heitler cross section has a complicated form which, thus far, has required the use of either numerical methods to integrate the differential cross section or severe approximations for analytic integration. In addition, as discussed by Maximon, de Miniac and Aniel, the direct use of the Bethe-Heitler cross- section is complicated by a sharp structure which can lead to the loss of 10 or more significant digits when evaluating the cross section.

Solution method:
The double differential cross section d2sigma/dKappa * dOmega for a photon of momentum Kappa emitted at an angle Theta with respect to the electron beam was derived by an analytic integration of the bremsstrahlung triple differential cross section d3sigma/ dKappa * dOmega * dOmega' in the photon energy Kappa, photon solid angle Omega and electron solid angle Omega'.

Restrictions:
The program requires QUAD precision to run. The use of double precision has lead to an error as great as a factor of two in some cases.

Running time:
3.02 seconds