Abstract
The number distributions of simultaneously emitted secondary electrons (SEs) from a thin carbon foil have been measured for the incidence of neutral hydrogen beams of 0.5–3.5 MeV together with foil-transmitted protons in order to examine the contribution of the loss electrons to the correlation between the forward and backward SE emission. The forward (backward) SE yields γF (γB), that is, the mean numbers of the forward-emitted (backward-emitted) electrons per projectile have been evaluated as a function of the number of backward-emitted (forward-emitted) SEs, nB (nF). At 1.0–2.5 MeV, γF (γB) decreases with increasing nB (nF). On the other hand, the dependence of γF (γB) on nB (nF) becomes slightly complicated at 3.0 and 3.5 MeV. A Monte Carlo simulation can well reproduce the observed incident energy dependence of the forward–backward correlation, where the loss electrons are found to play a crucial role.
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