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We present high-spatial resolution 21-cm HI VLA observations of the radiogalaxy 3C305 (z=0.041). These new high-resolution data show that the ~1000 km/sbroad HI absorption, earlier detected in low-resolution WSRT observations, isoccurring against the bright, eastern radio lobe, about 1.6 kpc from thenucleus. We use new optical spectra taken with the WHT to make a detailedcomparison of the kinematics of the neutral hydrogen with that of the ionisedgas. The striking similarity between the complex kinematics of the two gasphases suggests that both the ionised gas and the neutral gas are part of thesame outflow. Earlier studies of the ionised gas had already found evidence fora strong interaction between the radio jet and the interstellar medium at thelocation of the eastern radio lobe. Our results show that the fast outflowproduced by this interaction also contains a component of neutral atomichydrogen. The most likely interpretation is that the radio jet ionises the ISMand accelerates it to the high outflow velocities observed. Our observationsdemonstrate that, following this strong jet-cloud interaction, not all gasclouds are destroyed and that part of the gas can cool and become neutral. Themass outflow rate measured in 3C~305 is comparable, although at the lower endof the distribution, to that found in Ultra-Luminous IR galaxies. This suggeststhat AGN-driven outflows, and in particular jet-driven outflows, can have asimilar impact on the evolution of a galaxy as starburst-driven superwinds.Comment: Accepted for publication in A&A. 7 pages, 4 figure

The location of the broad H i absorption in 3C 305: clear evidence for a jet-accelerated neutral outflow