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Consider the four
processes
(i) p* →n+ e" +v.
(ii) Aº → p* + e* +v,
(iii) a* → e* + ve
(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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