  We suggest a way to capture by a focusing crystal the short-lived particles
(tau leptons, charmed baryons) produced in the decays downstream of a target
hit by primary protons. The beam of captured short-lived particles can be
extracted from the debris produced in the target and bent onto experimental
setup over a distance of centimetres. The debris is rejected by the crystal,
i.e. it remains nonchannelled. The technique can handle the particles with
decay length c{\tau} down to 1 micron.
