科研之友
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摘要
A two-dimensional classical trajectory model is used to explain the projectile breakup and above-barrier fusion suppression for the reactions Li-6+Bi-209, Li-6+Sm-152 and Li-6+Sm-144. To obtain the initial conditions of the equations of motion, a simplified model of the Li-6 nucleus has been developed. Numerical solutions of the equations lead to the classification of orbits into breakup and no-breakup trajectories. The breakup fraction is studied as a function of the impact parameter. Using quantum mechanical arguments, the cut-off impact parameter for fusion is determined by proposing a sharp cut-off model which assumes that there is an angular momentum limit to fusion. We introduce a simple formula for the explanation of fusion suppression, according to which fusion suppression is given by the average of the breakup fractions evaluated at impact parameters ranging from head-on collision up to the cut-off impact parameter. We find that there is excellent agreement between the experimental fusion cross section (sigma exp) and the calculated fusion cross section (sigma cal) for the systems studied.
- 出版日期2013-12
