Abstract
The formation of two-neutron halo is described using the neutron-neutron (n-n) interaction constrained by the low-energy n-n scattering limit. This method is tested for loosely- bound two neutrons in 24O, where a good agreement with experimental data is found. It is applied to halo neutrons in 22C, where the 20C-core is treated as a correlated-core with mixing of 2s1/2 orbit. This n-n interaction is shown to be strong enough to produce a two-neutron halo, locating 22C on the drip line, while 21C remains unbound. A unique relation between the two neutron separation energy, S2n, and the radius of neutron halo is presented. The estimated halo radius is found to be consistent with a recent experimental data. The appearance of Efimov states is discussed. The present method is extended to apply to the case of mixed configurations for the two-neutron halos such as 17B and 11Li.
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