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Manuscript Title: A computer program for internal conversion coefficients and particle parameters.
Authors: H.C. Pauli, U. Raff
Program title: CATAR
Catalogue identifier: ABGP_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 9(1975)392
Programming language: Fortran.
Computer: UNIVAC 1108.
Operating system: EXEC 8.
RAM: 26K words
Word size: 36
Keywords: Nuclear physics, Atomic shells, Screening, Dirac equation, Internal conversion Coefficient, Electric multipoles, Magnetic multipole Transitions, Internal conversion Particle parameters, Penetration effects, Activity detection.
Classification: 17.6.

Revision history:
Type Tit le Reference
correction 000ACORRECTION 16/08/77 See below

Nature of problem:
CATAR calculates internal conversion coefficients and particle parameters for electric and magnetic multipole transitions. The dynamic effects describing the interaction of the shell electrons with the nuclear charge and currents give rise to additional transition matrix elements (penetration matrix elements) through which the internal conversion process depends on the structure of the nucleus. The electric monoploe (Eo) internal conversion transition that is the most important penetration effect is also taken into account.

Solution method:
The Dirac equation is solved numerically for the bound and the free electron states in a central field with a Hartree-Fock-Slater screening function given by input. The radial matrix elements for electric and magnetic multipole transitions are calculated simultaneously for all multipole orders and partial waves allowed by selection rules for each transition energy and atomic subshell.

Restrictions:
The program should work for all nuclear charge numbers Z between 2<=Z<= 126 and all atomic shells. The number of highest mutlipole order is restricted to L=6. The energy of the electron should be larger than 50 eV and less than 5 MeV. The gamma transition k gamma must be within these limits, correspondingly. The function describing the screening of the nuclear charge by the atomic electrons ("screening function") must be given by input. For convenience the program has an option for a built-in, but approximate screening function, i.e., the analytical expression of Gaspar.

CORRECTION SUMMARY
Manuscript Title: Unpublished correction to a computer program for internal conversion coefficients and particle parameters.
Authors: H.C. Pauli, U. Raff
Program title: 000ACORRECTION 16/08/77
Catalogue identifier: ABGP_v1_0
Distribution format: gz
Classification: 17.6.