Answer to Question #282444 in Atomic and Nuclear Physics for BIGIRMANA Elie

Question

2. (a) A radioactive nucleus 180

72 X undergoes a series of radioactive α, β−, α, γ radiations and successively decays into X1, X2, X3 and X4. What are A and Z of the final nucleus X4.

(b) What is pair production? Explain why pair production cannot occur bellow an energy of

1.02MeV .

(c) Consider the following nuclear reactions. Classify all the elementary particles involved and

tell which of the two reactions is allowed / not allowed and explain why?.

i. p + ¯νe −→ n + µ

+

ii. p + ¯νe −→ n + e

+

(d) How much time (in years) will be required for 5 mg of 22Na (T1/2 = 2.60yrs) to reduce to 1

mg?.

Answer 1

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