Abstract
The reaction of 11Li, a nucleus characterized by a halo structure, is analyzed by the ( 9Li + n + n)-target four-body model in the intermediate energy region. The eikonal approximation and adiabatic approximation are employed not only to make the microscopic calculation feasible but to get intuitive pictures for the reaction mechanism. To test the accuracy of the eikonal approximation in the intermediate energy region, the deuteroon reaction is also analyzed by the (p + n)-target three-body model and compared with the coupled discretized continuum-channels analysis. It is found that the eikonal approximation works quite successfully for various reaction mechanisms including the break-up process. The total reaction cross section and the two-neutron removal cross section of the 11Li + 12C reaction are analyzed. The measured interaction cross section is nicely reproduced in our calculation. It is found that the elastic break-up process plays an important role in the intermediate energy region.
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