Nuclear reactions and nuclear ̄ssion
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چکیده
1 Cross sections and reaction rates 2 Consider a thin target of thickness dx and number density of targets nt being bombarded by a beam of number density Nb moving at velocity v. Each target nucleus presents a target area 3⁄4 { if one of the bombarding particles passes within the area 3⁄4, interaction (scattering, for example) occurs, otherwise not. Now if the beam covers an area A, the fraction of all the beam particles that will interact is the fraction of the beam area covered by targets:
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تاریخ انتشار 2002