Light exotic nuclei: A new explanation of halo

The experimental Tanihata density distributions for both protons and neutro ns in He-6,He-8 are very well reproduced here without an increase of the 1p neutron orbital size. Instead, an internal collective rotation, due to the invalidity of the adiabatic approximation, leads to the same measurable in crease in the radius and to a simultaneous decrease in the separation energ y of the nucleons participating in this rotation. Further support of the ap proach presented is gained by the reproduction of the ground-state properti es of Be7-11 and of the excited (particle and rotational) states of Be-11. (C) 2001 MAIK "Nauka/Interperiodica".