  Light chemical elements are, for instance, produced through ion collisions
taking place in the core of stars, where fusion is particularly important to
the synthesis of chemical elements. Meanwhile soliton provides non-interacting
transparency leading to the hindrance of fusion cross section. In order to
explain high fusion cross section actually observed in low incident energies,
it is necessary to discover the suppression mechanism of soliton propagation.
In this paper, based on a systematic three-dimensional time-dependent density
functional calculation, the existence of soliton is examined for ion collisions
with some incident energies, impact parameters, and nuclear force parameter
sets. As a result solitons are suggested to exist highly depending on the
energy. The suppression of soliton is consequently due to the spin-orbit force
and the momentum-dependent components of the nuclear force.
