Forward-Angle Yields Of ~(6,8)He and ~9Li Isotopesin ~(11)B (33 AMeV) + ~9Be Reaction

摘要

Using fragment-separator COMBAS [1] in forward-angle measurements the velocity, isotopic and element distributions of products with Z<7 in ~(11)B (33AMeV) + ~9Be reaction have been studied. The yields of ~(6,8)He and ~9Li isotopes on the ~9Be thick target (332.6 mg/cm~2) as a function of momentum acceptance of fragment -separator COMBAS have been measured. The production rates per lpμA of the primary beam of exotic nuclei of ~6He (6.9.10~3 pps), ~8He (2.10~4 pps) and ~9Li (4.3.10~2 pps) which can be used as secondary radioactive beams of halo -like nuclei have been determined. The two-neutron halo nuclei ~(6,8)He and ~9Li 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 ~9Li beam may be helpful in understanding of sub barrier fusion enhancement independent of the presence of the halo nucleons in used neutron -rich projectiles.