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We study emptiness formation probability (EFP) in interacting 1D Boseliquids. That is the probability that a snapshot of its ground state revealsexactly zero number of particles within the interval $|x|<R$. For a weaklyinteracting liquid there is parametrically wide regime $n^{-1} < R <\xi$ (here$n$ is the average density and $\xi$ is the healing length), where EFP exhibitsa non-trivial crossover from the Poisson to the Gaussian behavior. We employthe instanton technique [A. Abanov, 2004] to study quantitative details ofthese regime and compare it with previously reported limited cases.

Emptiness Formation Probability in 1D Bose Liquids