Pairing anti-halo effect

K. Bennaceur,^1,2 J. Dobaczewski,³ M. Poszajczak^2
1Centre d'Etudes de Bruyères-le-Châtel, BP 12, F-91680 Bruyères-le-Châtel, France
²Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM - CNRS/IN2P3, BP 5027, F-14076 Caen Cedex 5, France
³Institute of Theoretical Physics, Warsaw University, Hoza 69, PL-00681, Warsaw, Poland

Abstract:

We discuss pairing correlations in weakly bound neutron rich nuclei, by using the coordinate-space Hartree-Fock-Bogolyubov approach which allows to take properly into account the coupling to particle continuum. We show that the additional pairing binding energy acts against a development of an infinite rms radius, even in situations when an $\ell$=0 single-particle orbital becomes unbound.