The core momentum distribution of a weakly-bound neutron-neutron-core exotic nucleus is computed within a renormalized zero-range three-body model, with interactions in the s-wave channel. The halo wave-function in momentum space is obtained by using as inputs the two-body scattering lengths and the two-neutron separation energy. The core momentum densities are computed for Li-11, Be-14 C-20 and C-22. The model describes the experimental data for Li-11, Be-14 and to some extent C-20. The recoil momentum distribution of the C-20 from the breakup of C-22 nucleus is computed for different two neutron separation energies, and from the comparison with recent experimental data the two-neutron separation energy is estimated in the range 100 less than or similar to S-2n less than or similar to 400 keV. The recoil momentum distribution depends weakly on the neutron-C-20 scattering length, while the matter radius is strongly sensitive to it. The expected universality of the momentum distribution width is verified by also considering excited states for the system. (C) 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP(3).
展开▼
