Forward-Angle Yields Of [sup 6,8]He and [sup 9]Li Isotopes in [sup 11]B(33 AMeV)+[sup 9]Be Reaction

Using fragment-separator COMBAS [1] in forward-angle measurements the velocity, isotopic and element distributions of products with Z<7 in B-11 (33AMeV) + Be-9 reaction have been studied. The yields of He-6,He-8 and Li-9 isotopes on the Be-9 thick target (332.6 mg/cm(2)) as a function of momentum acceptance of fragment -separator COMBAS have been measured. The production rates per 1p mu A of the primary beam of exotic nuclei of He-6 (6.9.10(5) pps), He-8 (2.10(4) pps) and Li-9 (4.3.10(5) pps) which can be used as secondary radioactive beams of halo -like nuclei have been determined. The two-neutron halo nuclei He-6,He-8 and Li-9 are of great current interest both as very neutron-rich nuclei with a significant neutron skin and in understanding the interactions of very neutron-rich nuclei. The Li-9 beam may be helpful in understanding of sub barrier fusion enhancement independent of the presence of the halo nucleons in used neutron - rich projectiles.