  A fully ionized multi-nucleus plasma system (containing thermally degenerate
electron species, non-degenerate warm light nucleus species, and low dense
stationary heavy nucleus species) is considered. The basic features of thermal
and degenerate pressure driven small and arbitrary amplitude subsonic and
supersonic nucleus-acoustic solitary waves in such a plasma system are studied
by the pseudo-potential approach. The effects of stationary heavy nucleus,
non-relativistically and ultra-relativistically electron degeneracies, and
light nucleus temperature on small and arbitrary amplitude subsonic and
supersonic nucleus-acoustic solitary waves are also examined. It is found that
(i) the presence of stationary heavy nucleus species with Bolttzmann
distributed electron species supports the existence of subsonic
nucleus-acoustic solitary waves, and that the effects of electron degeneracies
and light nucleus temperature reduce the possibility for the formation of these
subsonic nucleus-acoustic solitary waves; (ii) the amplitude (width) of the
subsonic nucleus-acoustic solitary waves increases (decreases) with the rise of
the number density of heavy nucleus species; (iii) the amplitude of the
supersonic nucleus-acoustic solitary waves in the situation of
no-relativistically degenerate electron species is much smaller than that of
ultra-relativistically degenerate electron species, but is much larger than
that of isothermal electron species; (iv) their width in the situation of
non-relativistically degenerate electron species is much wider than that of
ultra-relativistically degenerate electron species; (v) their amplitude (width)
decreases (increases) with the rise of the light nucleus temperature. The
applications of the results in astrophysical, space, and laboratory plasma
situations are briefly discussed.
