  The many-body structure of high-lying excited states, including macroscopic
quantum superpositions, of the gaseous double-well BEC is presented within the
context of a multiconfigurational bosonic self-consistent field theory based
upon underlying symmetry-broken one-body wave functions. To better understand
our initial results, a model is constructed in the extreme Fock state limit, in
which macroscopic quantum self-trapped and superposition states emerge in the
many-body spectrum, striking a delicate balance between the degree of symmetry
breaking, the effects of the condensate's mean field, and that of atomic
correlation. It is found that, in general, the superposition state lies
energetically below its related self-trapped counterpart. Furthermore,
noticeably different spatial density profiles are associated with each type of
excited state.
