Journal of Statistical Physics, Vol. 116, Nos. 5/6, September 2004. p. 1579-1596.
We give the Green function, momentum distribution, two-particle correlation function, and structure factor for the bound state of N indistinguishable bosons with an attractive delta-function interaction in one dimension, and an argument showing that this boson "molecule" has no excited states other than dissociation into separated pieces.