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when any nucleus is bombarded to the particle then there is a formation of unstable nucleus for a very short time and the formation of final or stable product depends upon the energy of intermediate compound nucleus.
for example:
Al(A=13,Z=27) + H(A=1,Z=1) ----> Si(A=14,Z=28)
target nucleus bombarded particle unstable
intermediet compound nucleus
Si ----->Si(a=14,Z=27)+n(z=1) stable product
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