Solution of few-body problems with the stochastic variational method I. Central forces with zero orbital momentum Original Research Article

This paper presents a Fortran program to solve diverse few-body problems with the stochastic variational method. Depending on the available computational resources the program is applicable for N = 2-3-4-5-6-…-body systems with L = 0 total orbital momentum. The solution with the stochastic variational method is “automatic” and universal. One defines the system (number of particles, masses, symmetry, interaction, etc.) and the program finds the ground state energy and wave function. The examples include nuclear (alpha particle: four-body, 6He: six-body), atomic (tdμ− 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.