Summary

This is not a single book but a collection of research papers by J. Hans D. Jensen, primarily published in the 1930s–1950s in *Zeitschrift für Physik* and *Physical Review*. The central thesis of Jensen’s work, culminating in his 1963 Nobel Prize shared with Maria Goeppert Mayer, is that atomic nuclei exhibit a shell structure analogous to electron shells in atoms, governed by a strong spin-orbit coupling. His key papers provided the theoretical and experimental evidence for the nuclear shell model, explaining the stability of nuclei with certain "magic numbers" of protons or neutrons (2, 8, 20, 28, 50, 82, 126). A reader takes away a concrete understanding of how quantum mechanics applies to the nucleus, the role of the spin-orbit interaction in ordering nuclear energy levels, and the empirical basis for predicting nuclear properties like spin and parity.

Full text isn't indexed yet — this overview draws on general knowledge of the book and its metadata, and chat works the same way.

Key concepts

Magic numbers — Specific counts of protons or neutrons (e.g., 2, 8, 20, 28, 50, 82, 126) that result in unusually stable atomic nuclei, analogous to noble gas electron configurations.
Spin-orbit coupling (nuclear) — A strong interaction between a nucleon’s intrinsic spin and its orbital angular momentum within the nucleus, which splits energy levels and creates the shell gaps responsible for magic numbers.
Nuclear shell model — A theoretical framework describing nucleons as occupying discrete quantum energy levels (shells) in a central potential, with the Pauli exclusion principle governing occupancy.
j-j coupling — A coupling scheme in nuclear physics where each nucleon’s spin and orbital angular momentum combine to a total angular momentum j, used to predict nuclear ground-state spins and parities.
Nuclear binding energy — The energy required to disassemble a nucleus into its constituent protons and neutrons, whose systematic variations across isotopes provided empirical evidence for shell closures.