| 21. | Of all nuclides, iron-56 has the lowest mass per nucleon.
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| 22. | First, the strong interaction acts essentially among the quarks forming the nucleons.
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| 23. | A calculation of nucleon magnetic moments from first principles is not yet available.
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| 24. | Heisenberg introduced the first theory of nuclear exchange forces that bind the nucleons.
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| 25. | With this potential nucleons can become bound with a negative " binding energy ."
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| 26. | The nuclear force is nearly independent of whether the nucleons are neutrons or protons.
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| 27. | However, the and have no nucleon equivalent.
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| 28. | The nuclear magnetic moment also includes contributions from the orbital motion of the nucleons.
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| 29. | Most additional correlations among nucleons which do not enter the mean field are neglected.
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| 30. | It has relatively small binding energy per nucleon.
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