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• In most nuclear reactions the total nucleon number is conserved; that is, ∑ Ainitial = ∑ Afinal, where A = Z + N for each nucleus, as usual. Show that, except in reactions involving β decay, both ∑ Z and ∑ N are separately conserved. [Hint: Total charge is always conserved, and except in β decay, all the charge is carried by protons.]
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