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We examine Cr isotopes at the drip line, where surface effects related to theexistence of a weakly bound $s1/2$ state are known to be important and tightlyconnected with the pairing phenomenon (anti-halo effect). For theseweakly-bound isotopes, we evaluate the ground state to ground state two-neutrontransfer probabilities within a mean-field-based approach. An important part ofthe discussion is devoted to the analysis of several procedures that can beemployed to constrain the parameters of a phenomenological pairing interaction.The parameters are first adjusted to reproduce the experimental gaps evaluatedwith the five-point formula. This choice has however some consequences on theevolution of the pairing correlations along the isotopic chains and, inparticular, at shell closures. Other procedures are then followed (adjustmenton a theoretical pairing gap at mid-shell and on the two-neutron separationenergies).  For the transfer probabilities, we discuss the effects associated todifferent choices of the spatial localization of the pairing interaction. Weindicate that the analysis of pair-transfer reactions for such cases (where thelast bound state is a low-$l$ state in a weakly bound nucleus) may improve ourunderstanding of two aspects: the spatial distribution of pairing correlationsin nuclei and the general problem of the persistence of pairing at the driplines.

Two-neutron transfer probabilities and spatial-localization effects at the drip line