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[Licence| Download | New Version Template] adgf_v1_0.tar.gz(41 Kbytes)
Manuscript Title: Solution of few-body problems with the stochastic variational method: I. Central forces.
Authors: K. Varga, Y. Suzuki
Program title: FBS
Catalogue identifier: ADGF_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 106(1997)157
Programming language: Fortran.
Operating system: MSDOS, UNIX.
Keywords: Atomic physics, Nuclear physics, Theoretical methods, Few-body problems in atomic, nuclear and subnuclear physics, Stochastic variational method, Correlated gaussian basis.
Classification: 2.9, 17.16.

Nature of problem:
This computer code solves N = 2 - 3 - 4 - 5 - 6 -..-body problems. The number of particles, symmetry, interaction, etc. are input data and the program can solve various few-body problems. The examples include nuclear (alpha particle: four-body, 6He: six-body), atomic (tdmu- and e+e-e+e-) and subnuclear (the nucleon and the delta in a nonrelativistic quark model) systems. The solutions are accurate for excited states as well, and even the Efimov-states can be studied.

Solution method:
The wave function of the system is approximated by linear combinations of correlated Gaussians. This basis is optimized with the stochastic variational method.

Restrictions:
The practical limit, depending on the required accuracy, is around N = 8 - 10 particles. In principle it is possible to use the program for arbitrary N but the computational time becomes excessive.

Running time:
For the examples in the test run input, the computational time varies between few seconds (simplest case) and 1 hour.