Question

.Find the yield and estimate the average cross section for the (a, n) reaction excited by 7 MeV a-particles in a thick aluminum target if 1.60 × 109 neutrons are emitted per second. The a-particle current is 1.56 1014 s-1

Answer 1

$E_0p=En,\implies$

$E=E_0\frac pn=683~GeV.$