  New measurements of the interaction cross sections of 22,23O at 900A MeV
performed at the GSI, Darmstadt are reported that address the unsolved puzzle
of the large cross section previously observed for 23O. The matter radii for
these oxygen isotopes extracted through a Glauber model analysis are in good
agreement with the new predictions of the ab initio coupled-cluster theory
reported here. They are consistent with a 22O+neutron description of 23O as
well.
