Consider the four processes (i) p* → n+e* +v. (ii) ^º → p* +e* +v. (iii) a* → e* + v. (iv) n" →y+Y which of the above is/are forbidden for free particles? (a) only (ii) (b) (ii) and (iv) (c) (i) and (iv) (d) (i) and (ii)
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