Suppression of core polarization in halo nuclei

Details Suppression of core polarization in halo nuclei Suppression of core polarization in halo nuclei

1996-07-04

arxiv.org/abs/nucl-th/9607008v2

Phys.Rev.Lett. 78 (1997) 2708-2711

Physics

Nuclear Physics

Nuclear Theory

11 pages, RevTex, 2 postscript figures; major revisions, matches version to appear in Phys. Rev. Letters

Scientific paper

10.1103/PhysRevLett.78.2708

We present a microscopic study of halo nuclei, starting from the Paris and Bonn potentials and employing a two-frequency shell model approach. It is found that the core-polarization effect is dramatically suppressed in such nuclei. Consequently the effective interaction for halo nucleons is almost entirely given by the bare G-matrix alone, which presently can be evaluated with a high degree of accuracy. The experimental pairing energies between the two halo neutrons in $^6$He and $^{11}$Li nuclei are satisfactorily reproduced by our calculation. It is suggested that the fundamental nucleon-nucleon interaction can be probed in a clearer and more direct way in halo nuclei than in ordinary nuclei.

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