An ambitious CERN experiment -- PUMA -- is going to form anti-protonic atoms of unstable nuclei. The purpose is to detect π-mesonic decays of such atoms and extract the neutron excess at nuclear surfaces : the neutron haloes - of N>> Z nuclei. In this talk a method to analyse such experiments is discussed. Studies of old experiments with standard anti-protonic atoms indicate that pionisation experiments may offer rich data. In addition to neutron haloes one could learn effects of short-range p-n correlations , possibly learn existence or non-existence of α type structures at distant nuclear radii. All depends on our control of nucleon-antinucleon interactions , and naturally on the precision of experiment.
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