Abstract
The recently measured interaction cross section data for 22 N, 23 O, and 24 Fi n a 12 C target at relativistic energies have been analysed in a few body Glauber model approach. Conventional fixed core-plus-neutron model for halo nuclei is unable to explain the observed enhanced cross section for these nuclei by any selection of the neutron orbitals. Microscopic calculations like many-body Monte Carlo shell model, relativistic mean field theory and cluster model are also shown to fail in describing the large difference if interaction cross section between 22 Oa nd 23 O. A possibility of core enlargement is suggested in these nuclei. 2001 Elsevier Science B.V. All rights reserved.
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