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Vicinage effect on the yield of convoy electrons emitted from thin carbon foil induced by the penetration of 3.5 MeV/atom C$$_{n}$$$$^{+}$$ ions

3.5MeV/atom C$$_{n}$$$$^{+}$$イオンの通過によって誘起される薄い炭素箔から放出されるコンボイ電子収量に対する近接効果

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*

Shiina, Yoko*; Kinoshita, Ryo*; Funada, Shuhei*; Matsuda, Makoto; Imai, Makoto*; Kawatsura, Kiyoshi*; Sataka, Masao*; Sasa, Kimikazu*; Kaneko, Toshiaki*; Tomita, Shigeo*

We investigated the target thickness dependence of convoy electron yields resulting from bombardments with 3.5 MeV/atom C$$_{n}$$$$^{+}$$ (n = 1 - 3) cluster ions. We observed that for bombardments with C$$_{2}$$$$^{+}$$ and C$$_{3}$$$$^{+}$$ ions, the convoy electron yield per atom, Y$$_{n}$$/n, reaches a maximum around 3-5 $$mu$$g/cm$$^{2}$$ and decreases with increasing target thickness from 3.1 to 10.5 $$mu$$g/cm$$^{2}$$, 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$$_{n}$$ $$propto$$ n$$^{2}$$, consistent with previous observations. We found that the escape length of the convoy electrons for C$$_{3}$$$$^{+}$$ and C$$_{2}$$$$^{+}$$ 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$$_{n}$$ $$>$$ nY$$_{1}$$) on the convoy electron yield.

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