  Accurate quantum Monte Carlo calculations of ground and low-lying excited
states of light p-shell nuclei are now possible for realistic nuclear
Hamiltonians that fit nucleon-nucleon scattering data. At present, results for
more than 30 different (J^pi;T) states, plus isobaric analogs, in A \leq 8
nuclei have been obtained with an excellent reproduction of the experimental
energy spectrum. These microscopic calculations show that nuclear structure,
including both single-particle and clustering aspects, can be explained
starting from elementary two- and three-nucleon interactions. Various density
and momentum distributions, electromagnetic form factors, and spectroscopic
factors have also been computed, as well as electroweak capture reactions of
astrophysical interest.
