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

Asked by haider.samina | 7th Mar, 2015, 10:39: AM

Expert Answer:

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.

Answered by Romal Bhansali | 9th Mar, 2015, 07:51: PM