A 24Mg 20Ne Kr Mo Te Sm Lu 7.6 Ra 238U 160 Hg 8 12CH He 7 SHe 1 A 150 200 100 50 Atomic mass jure 31.26 A graph of average binding energy per nucleon, BE/A, for stable nuclei. The most tightly bound nuclei are those with A near where the attractive nuclear force has its greatest effect. At higher A s, the Coulomb repulsion progressively reduces the binding energy r nucleon, because the nuclear force is short ranged. The spikes on the curve are very tightly bound nuclides and indicate shell closures. Binding energy per nucleon (MeV per nucleon)
A 24Mg 20Ne Kr Mo Te Sm Lu 7.6 Ra 238U 160 Hg 8 12CH He 7 SHe 1 A 150 200 100 50 Atomic mass jure 31.26 A graph of average binding energy per nucleon, BE/A, for stable nuclei. The most tightly bound nuclei are those with A near where the attractive nuclear force has its greatest effect. At higher A s, the Coulomb repulsion progressively reduces the binding energy r nucleon, because the nuclear force is short ranged. The spikes on the curve are very tightly bound nuclides and indicate shell closures. Binding energy per nucleon (MeV per nucleon)
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2H is a loosely bound isotope of hydrogen. Called deuterium or heavy hydrogen, it is stable but relatively rare—it is 0.015% of natural hydrogen. Note that deuterium has Z = N , which should tend to make it more tightly bound, but both are odd numbers. Calculate BE/A , the binding energy per nucleon, for 2H and compare it with the approximate value obtained from the graph in Figure 31.26
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