  We explore the structure of the ground state of $^{20}$Ne by investigating
various density profiles. Four candidates for the ground state configurations,
(a) $j$-$j$ coupling and (b) SU(3) shell model and (c) $5\alpha$ and (d)
$^{16}{\rm O}+\alpha$ cluster model configurations are generated by utilizing
the antisymmetrized quasicluster model. A high-energy reaction theory, the
Glauber model, relates these one-body density distributions and reaction
observables. The angular distributions of the elastic scattering cross sections
clearly distinguish these configurations and tell which is the most plausible
one: The ground state of $^{20}$Ne favors a 16+4 nucleon bi-cluster structure.
A comprehensive investigation of other electric observables also supports this
conclusion.
