Equation 22 · The Valley of Stability Is a Fitness Landscape
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the fix the mass number. Read the equation part by part below; each part has a contextual explanation and a link to its mathematical background.
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Fix the mass number A and let Z vary. Because the Coulomb and asymmetry terms in the semi-empirical mass formula are both approximately quadratic in Z at fixed A , the atomic mass along an isobaric chain is, to good approximation, a parabola in Z :
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