[Majorana] worked out a theory on light nuclei, assuming that they consisted solely of protons and neutrons (or neutral protons as he then said) and that the former interacted with the latter through exchange forces. He also reached the conclusion that these exchange forces must act only on the space co-ordinates (and not on the spin) if one wanted the alfa particle, and not the deuteron, to be the system saturated with respect to binding energy.
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