Figure 7
Positron energy spectrum: (a) \({a}_{0}=5\); (b) \({a}_{0}=10\); (c) \({a}_{0}=15\); (d) \({a}_{0}=20\). The red curve represents the positron energy spectrum in the MST case, while the blue curve represents the positron energy spectrum in the planar target case.
