The three-boson low energy effective interaction influences the dynamic
and the static properties of many bosons, including the ground state
energies of dilute Bose-Einstein condensates. The three-body scattering
hypervolume, which is a three-body analogue of the two-body scattering
length, characterizes this effective interaction. For bosons with a
soft-ball potential -- the Gaussian potential, we determine the
scattering hypervolume by solving the three-body Schrödinger equation
numerically, and matching the solution with the asymptotic expansions
for the wave function at large hyperradii.
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