  Structures of light unstable nuclei, Li, Be, B, and C isotopes are
systematically studied with a microscopic method of antisymmetrized molecular
dynamics. The theoretical method is found to be very useful to study ground and
excited states of various nuclei covering unstable nuclei. The calculations
succeed to reproduce many experimental data for nuclear structures; energies,
radii, magnetic dipole moments, electric quadrupole moments, transition
strength. In the theoretical results it is found that various exotic phenomena
in unstable nuclei such as molecular-like structures, neutron skin, and large
deformations may appear in unstabel nuclei. We investigate the structure change
with the increase of neutron number and with the increase of the excitation
energies, and find the drastic changes between shell-model-like structures and
clustering structures. The mechanism of clustering developments in unstable
nuclei are discussed.
