Vicinage effect on the yield of convoy electrons emitted from thin carbon foil induced by the penetration of 3.5 MeV/atom C ions

椎名 陽子*; 木下 亮*; 舟田 周平*; 松田 誠; 今井 誠*; 川面 澄*; 左高 正雄*; 笹 公和*; 金子 敏明*; 冨田 成夫*

Physical Review A, 110(6), p.062826_1 - 062826_7, 2024/12

https://doi.org/10.1103/PhysRevA.110.062826

We investigated the target thickness dependence of convoy electron yields resulting from bombardments with 3.5 MeV/atom C (n = 1 - 3) cluster ions. We observed that for bombardments with C and C ions, the convoy electron yield per atom, Y/n, reaches a maximum around 3-5 g/cm and decreases with increasing target thickness from 3.1 to 10.5 g/cm, and ultimately reaches an asymptotic value. This asymptotic value of the convoy electron yield was nearly proportional to the size of the cluster n, that is, Y n, consistent with previous observations. We found that the escape length of the convoy electrons for C and C is much longer than that of C bombardment. The present result suggests that the enhancement of the escape length could be the origin of this vicinage effect (i.e., Y nY) on the convoy electron yield.