The sources of theoretical uncertainties in the prediction of the two-neutrondrip line are analyzed in the framework of covariant density functional theory.We concentrate on single-particle and pairing properties as potential sourcesof these uncertainties. The major source of these uncertainties can be tracedback to the differences in the underlying single-particle structure of thevarious covariant energy density functionals (CEDF). It is found that theuncertainties in the description of single-particle energies at the two-neutrondrip line are dominated by those existing already in known nuclei. Onlyapproximately one third of these uncertainties are due to the uncertainties inthe isovector channel of CEDF's. Thus, improving the CEDF description ofsingle-particle energies in known nuclei will also reduce the uncertainties inthe prediction of the position of two-neutron drip line. The predictions ofpairing properties in neutron rich nuclei depend on the CEDF. Although pairingproperties affect moderately the position of the two-neutron drip line theyrepresent only a secondary source for the uncertainties in the definition ofthe position of the two-neutron drip line.
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