Special roles of loose neutron-halo nucleus structure on the fragmentation and momentum dissipation in heavy ion collisions

We studied the special roles of loose neutron-halo structure of B-19 on the fragmentation and momentum dissipation by using isospin dependent quantum molecular dynamics. In order to protrude the special roles of neutron-halo structure on the reaction dynamics we compared the fragmentation multiplicity and nuclear stopping (momentum dissipations) induced by neutron-halo nucleus B-19 with those induced by a same mass stable nucleus F-19 under the same incident channel condition. We found that the loose neutron-halo structure of B-19 increases the fragmentation multiplicity in lower beam energy region. On the contrary, the special halo structure of B-19 weakens the nuclear stopping, compared to those induced by stable nucleus F-19. However both fragmentation multiplicity-difference and nuclear stopping-difference between the reactions induced by B-19 and F-19 gradually decrease and finally disappear as the increase of beam energy. These results suggest a good project for the experimental measurements of the fragmentation multiplicity and nuclear stopping to study the reaction dynamics induced by neutron-halo nuclei. (c) 2005 Elsevier B.V. All rights reserved.