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