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Manuscript Title: A computer program for determination of nuclear parameters from internal conversion experiments.
Authors: M. Rysavy, O. Dragoun
Program title: CFIT
Catalogue identifier: ABGS_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 19(1980)93
Programming language: Fortran.
Computer: IBM 370/135.
Operating system: OS/VS1, OS/ES4.1M4.
RAM: 13K words
Word size: 32
Keywords: Nuclear physics, Internal conversion, Transition, Penetration effect, Multipole mixture, Least-squares method, Data experimental, Activity detection.
Classification: 17.6.

Nature of problem:
The program analyzes the experimental data on gamma-ray internal conversion and determines the multipolarity mixing parameter and penetration parameter of the magnetic component for the nuclear electromagnetic transitions.

Solution method:
The best values of the parameters are found by the least-squares method. Due to the nonlinearity of the problem, the Gauss linearization method is used. The iterations are performed until the change in the least- squares sum is less than 0.1%. If this condition is not fulfilled within 100 iterations, the execution is terminated. All operations are performed using double precision.

Restrictions:
For a particular nuclear transition, a maximum of 25 experimental data items can be treated simultaneously. The program is not suitable for studying the hindered E1 transitions.

Running time:
The running time depends mostly on the guess values of the parameters (given via input) and is typically 1 to 3 s per transition analyzed.