Part I: Foundations — The Nuclear World

"All science is either physics or stamp collecting." — Ernest Rutherford (attributed)

Rutherford meant it as a boast, but nuclear physics is the branch that makes the case strongest. The nucleus sits at the intersection of the fundamental forces — the strong force that binds it, the electromagnetic force that tries to tear it apart, and the weak force that transforms its constituents. Understanding the nucleus requires quantum mechanics, special relativity, and many-body theory, all operating in a regime where no single approximation captures the full picture.

In these five chapters, we build the foundations on which the rest of the book stands. We begin with the experimental discovery of the nucleus and the chart of nuclides — the map of all known nuclei that organizes the entire field. We then survey the systematic properties of nuclei: their sizes, shapes, masses, spins, and electromagnetic moments. Next comes the nuclear force itself — the interaction that holds the nucleus together despite the Coulomb repulsion of its protons — from Yukawa's meson exchange picture to the modern effective field theory perspective. The semi-empirical mass formula shows how far we can get by treating the nucleus as a liquid drop with quantum corrections, and where that picture breaks down. Finally, a targeted review of the quantum mechanical tools needed for nuclear physics — angular momentum coupling, perturbation theory, identical particles — ensures that every reader is prepared for the detailed structure, decay, and reaction physics that follows.

By the end of Part I, you will have the vocabulary, the data, the forces, and the mathematical tools. The rest of the book applies them.

Chapters in Part I: - Chapter 1: The Discovery of the Nucleus — from Rutherford scattering to the chart of nuclides - Chapter 2: Nuclear Properties — size, shape, mass, spin, and moments - Chapter 3: The Nuclear Force — what holds the nucleus together - Chapter 4: The Semi-Empirical Mass Formula — a liquid drop with quantum corrections - Chapter 5: Quantum Mechanics Review — the tools you need for nuclear physics

Chapters in This Part