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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.

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.