J. Hans D. Jensen developed a nuclear shell model in which strong spin-orbit coupling reorganizes the levels available to protons and neutrons. The mechanism connects the observed nuclear magic numbers with gaps in a one-particle spectrum: filling a level with total angular momentum accommodates magnetic substates. His historical lecture describes how measured nuclear spins, binding patterns and other spectroscopic evidence constrained the model, rather than treating the choice of level ordering as purely mathematical.[ref]
A physicist.[ref]
https://www.physik.uni-heidelberg.de/historisches?lang=de. Independent professional profile
Portrait of J. Hans D. Jensen
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J. Hans D. Jensen is likely referring to Johannes Hans Daniel Jensen, a German physicist who was awarded the Nobel Prize in Physics in 1963 for his work on the structure of atomic nuclei. Jensen's contributions played a significant role in the development of nuclear physics and understanding how protons and neutrons are arranged within the nucleus. He was known for his research in nuclear shell models, which helped explain the behavior of atomic nuclei.