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Manuscript Title: Alpha-decay half-life semiempirical relationships with self-improving parameters.
Authors: D.N. Poenaru, M. Ivascu, D. Mazilu
Catalogue identifier: ABQQ_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 25(1982)297
Programming language: Fortran.
Computer: IBM 370/135.
Operating system: DOS/VS-310.
RAM: 95K words
Word size: 8
Keywords: Nuclear physics, Particle detection, Radioactivity, Alpha decay, Semiempirical formulae, Half-life.
Classification: 17.5.

Nature of problem:
From the alpha decay Q-values, the partial half-life T is estimated by using five semiempirical relationships. The parameters of these formulae have been obtained from a fit with a given set of experimental data on four groups of alpha emitters: even-even, even-odd, odd-even and odd-odd. For each nuclide only the strongest transition is considered and the data are automatically sorted into the four groups mentioned above. There are three options: one can use either the present set of parameter values, a new one given as input data, or new values computed by using a better set of experimental data (more accurate or more complete). For each group of nuclides, up to 8 (or 9) families of curves could be plotted, optionally, with the line printer. The calculated life-time can be compared either with the experimental one, if it is available, or with the time.

Solution method:
Only the additive parameters of the log T formulae are modified, by requesting a vanishing mean value of the absolute errors. The B- parameters are obtained by a parabolic least square fit.

The maximum number of alpha emitters in each of the four groups can not be larger than 300 in a given run. Up to 40 curves are accepted by the plotting subroutine.

Unusual features:
The subroutines MZDPLT and MZDPFT could be used in other programs to plot a family of curves, or to make a bidimensional parabolic least squares fit, respectively.

Running time:
For 100 alpha emitters, the typical CPU running time on an IBM 370/135 ranges from 7 s (no plot) to 20 s (9 diagrams plotted) in the self- improving mode of operation and from 6 s to 18 s with the present set of parameters.