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We consider the one dimensional expansion of a system of interacting bosons,starting from a regular array. Without interactions the familiar Hanbury Brownand Twiss effect for bosons gives rise to a series of peaks in thedensity-density correlations of the expanded system. Infinitely repulsiveparticles likewise give a series of dips, a signature of the underlyingdescription in terms of free fermions. In the intermediate case of finiteinteraction the noise correlations consist of a set of Fano resonancelineshapes, with an asymmetry parameter determined by the scattering phaseshift of a pair of particles, and a width depending on the initial momentumspread of the particles.

Noise correlations in the expansion of an interacting 1D Bose gas from a regular array