The prompt neutrino (νₑ+νₑ) flux produced by the interaction of 400-GeV protons with targets of beryllium, copper, and tungsten has been measured in a beam-dump experiment at Fermilab. With the assumption that these neutrinos arise from charm decay, the cross section for charm production by protons on nuclei varies as A^α, where α=0.75±0.05. No significant variation of α with neutrino energy is observed.
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Duffy et al. (1985) studied this question.
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