Potassium-40 (Z = 19, N = 21) is a radioactive isotope that is rare but not unknown in nature, It is particularly interesting in that it lies along the curve of stability yet decays by both ß+ and ß- that is, in both directions away from the curve of stability, (a) Identify the daughter nuclei for both decays, (b) Many factors governing nuclear stability are discussed in the chapter (e.g., those in the semiempirieal binding energy formula, magic numbers, and even numbers). Identify those that would argue only for β- decay, (c) Which factors argue only for β+ decay? (d) Which argue for either β- or β+ decay?
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