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As we know, the reaction rate can be calculated as following:

R = N * σ * Φ (1)

Where R is reaction rate (events/s/cm^{3})

σ is cross section (cm^{2})

Φ is flux of incident particle beam (particles/s/cm^{2}

N is density of target (atoms/cm^{3})

Logically, there is a limitation of R, because R cannot larger than the number of incident particles. But as equation (1), if Φ is constant, that means the number of incident particles is unchanged, and N increases, R will increase without any limitation. So if N is big enough, R will pass the limit that I talked above.

I hope that you can understand my idea well, because, my English is so bad.

Thank you very much,

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# I About Reaction Rate?

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