  The soliton existence in sub-atomic many-nucleon systems is discussed. In
many nucleon dynamics represented by the nuclear time-dependent density
functional formalism, much attention is paid to energy and mass dependence of
the soliton existence. In conclusion, the existence of nuclear soliton is
clarified if the temperature of nuclear system is from 10 to 30 MeV. With
respect to the mass dependence $^{4}$He and $^{16}$O are suggested to be the
candidates for the self-bound states exhibiting the property of nuclear
soliton.
