Programs in Physics & Physical Chemistry
|[Licence| Download | New Version Template] abqq_v1_0.gz(18 Kbytes)|
|Manuscript Title: Alpha-decay half-life semiempirical relationships with self-improving parameters.|
|Authors: D.N. Poenaru, M. Ivascu, D. Mazilu|
|Program title: SEMIEMPIRICAL ALPHA HALF-LIFE|
|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.|
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.
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.
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.
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.
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