Question
Sat March 07, 2015 By: Samina Haider

why an alpha particle but not a proton is emitted by radioactive nuclei?

Expert Reply
Romal Bhansali
Mon March 09, 2015
A proton is also emitted in a radioactive decay. However, this happens only for nuclei which are proton rich and it is also followed by a beta decay.
So, a proton emitting from a nucleus is highly improbable.
 
An alpha particle is the favoured decay particle as it lends stability to the nuclei.
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