Fusion of9,11Li with208Pb

W Loveland

doi:10.1051/epjconf/20111702003

Abstract

The fusion excitation functions for the reaction of 9 Li with 70 Zn and 208 Pb were measured. In the reaction with 70 Zn, the evaporation residues (EVRs) were detected by a radiochemical separation of the As and Ge EVRs followed by -counting. In the reaction with 208 Pb, the At EVRs were detected by -counting. In both systems, one observes substantial sub-barrier fusion enhancement that cannot be explained by coupled channels calculations. The implication of these studies for the study of the 11 Li + 208 Pb reaction are discussed.

Highlights

One of the most active areas of research with radioactive beams is the study of the fusion of weakly bound nuclei, such as the halo nuclei
The central issue is whether the fusion cross section will be enhanced due to the large nuclear size of the halo nucleus or whether fusionlimiting breakup of the weakly bound valence nucleons will lead to a decreased fusion cross section
The nuclear structure and nuclear reactions of 9Li are of interest for three reasons. (a) It is the core nucleus of the two-neutron halo nucleus 11Li that is of great current interest and an understanding of 9Li is important for an understanding of 11Li. (b) 9Li is itself a very neutron-rich nucleus (N/Z = 2) with a significant neutron skin [2] and an understanding of its reactions may be helpful in understanding the interactions of very neutron-rich nuclei. (c) 9Li is a well-characterized nucleus with a simple shell-model structure, which should be helpful in modeling its interactions

Summary

Introduction

One of the most active areas of research with radioactive beams is the study of the fusion of weakly bound nuclei, such as the halo nuclei. In this context, the nuclear structure and nuclear reactions of 9Li are of interest for three reasons. (b) 9Li is itself a very neutron-rich nucleus (N/Z = 2) with a significant neutron skin [2] and an understanding of its reactions may be helpful in understanding the interactions of very neutron-rich nuclei.

Experimental

Results and Discussion

Future Work

Conclusions