| Introduction | p. xi |
| Some Background to my Notes on Fermi's Neutron Physics Lectures (Los Alamos, 1945) | p. xxxi |
| Neutron Physics | p. 1 |
| Neutron Physics - A Course of Lectures | p. 3 |
| Sources of Neutrons | p. 5 |
| Natural Sources | p. 5 |
| Alpha Particle Sources | p. 5 |
| Photo-Neutron Sources | p. 7 |
| Artificial Sources | p. 7 |
| The Isotopic Chart: Nuclear Masses and Energies | p. 9 |
| The Isotopic Chart | p. 9 |
| Energy Balance of Reactions | p. 10 |
| The Binding Energies of Nuclei | p. 12 |
| The Packing Fraction Curve | p. 12 |
| The Scattering of Neutrons (Part 1) | p. 17 |
| General Considerations | p. 17 |
| Elementary Theoretical Treatment | p. 19 |
| Elastic Scattering | p. 20 |
| Inelastic (n, n) Scattering | p. 21 |
| Inelastic (n, m) Scattering | p. 21 |
| Inelastic (n, y) Scattering | p. 22 |
| Resonance: Models of the Nucleus | p. 25 |
| Resonance in Nuclear Reactions | p. 25 |
| Two Models of the Nucleus | p. 27 |
| The Scattering of Neutrons (Part 2) | p. 31 |
| The Solution of Schrödinger's Equation | p. 31 |
| The Scattering Cross Section | p. 34 |
| Neutron-Proton scattering | p. 35 |
| The Breit-Wigner Formula | p. 36 |
| The Effect of Chemical Binding on Scattering | p. 38 |
| Scattering Cross Section for Other Elements | p. 39 |
| Slow Neutrons as Waves | p. 41 |
| Introduction | p. 41 |
| Isotopic Effects | p. 43 |
| Penetration by Thermal Neutrons | p. 44 |
| The Production of Very Slow Neutrons | p. 46 |
| Reflection and Refraction | p. 47 |
| The Slowing Down of Neutrons | p. 49 |
| Introduction | p. 49 |
| The Energy Loss in One Collision | p. 50 |
| Many Collisions | p. 52 |
| The Spatial Distribution of Slowed Neutrons | p. 54 |
| Theory of the Spatial Distribution | p. 58 |
| The Age Equation | p. 65 |
| Derivation of the Age Equation | p. 65 |
| Diffusion | p. 65 |
| Energy Drift | p. 66 |
| The Problem of a Point Source | p. 68 |
| Thermal Neutron Distributions | p. 71 |
| The Basic Equation | p. 71 |
| Point Source of Slow Neutrons | p. 72 |
| Point Source of Fast Neutrons | p. 72 |
| Bounded Media | p. 73 |
| The Measurement of Diffusion Length | p. 76 |
| Diffusion in Graphite | p. 77 |
| Some Useful Quantities and Relationships | p. 80 |
| The Reflection of Neutrons | p. 81 |
| Introduction | p. 81 |
| Approximate Solution of the Escape Problem | p. 81 |
| Exact Solution by Integral Equation Method | p. 82 |
| The Albedo | p. 85 |
| Measurement of the Albedo | p. 85 |
| The Stability of Nuclei | p. 87 |
| The Binding Energy of a Nucleus | p. 87 |
| The Liquid Drop Model | p. 87 |
| Nuclear Composition | p. 88 |
| Coulomb Forces | p. 89 |
| The Odd-Even Effect | p. 89 |
| Determination of Coefficients | p. 90 |
| The Binding of Neutrons to Nuclei | p. 91 |
| Nuclear Fission | p. 93 |
| The Possibility of Fission | p. 93 |
| Limitations on the Occurrence of Fission | p. 95 |
| The Liquid Drop Model in Fission | p. 97 |
| The Particles of Fission | p. 99 |
| Cross Sections for Fission and Other Processes | p. 102 |
| The Possibility of a Chain Reaction | p. 105 |
| The Properties of Natural Uranium | p. 105 |
| The High Energy Region | p. 106 |
| The Thermal Region | p. 107 |
| Moderators | p. 107 |
| Homogeneous and Lumped Graphite Piles | p. 108 |
| The Possibility of a Homogeneous Pile | p. 112 |
| The Heterogeneous Pile | p. 115 |
| The Design of a Lumped Pile | p. 115 |
| The Determination of Pile Constants | p. 116 |
| The Magnitude of ¿ | p. 116 |
| (1 - fR) | p. 116 |
| Calculation of fT | p. 117 |
| Reproduction Factor and Critical Size | p. 119 |
| The Time Dependence of a Pile | p. 123 |
| The Time-Dependent Equations | p. 123 |
| Evaluation of the Period | p. 125 |
| Practical Aspects of Pile Physics | p. 131 |
| The Determination of K | p. 131 |
| The Study of Pile Materials | p. 132 |
| Energy and Radiation Production | p. 133 |
| Shielding | p. 134 |
| Other Types of Piles | p. 136 |
| Fast Reactors | p. 139 |
| Elementary Considerations | p. 139 |
| The Integral Equation to the Neutron Distribution | p. 141 |
| The Critical Size for a Fast Reactor | p. 144 |
| Supercritical Reactors | p. 151 |
| Problems and Exercises | p. 153 |
| Nuclear Reactors | p. 159 |
| Process for the Production of Radioactive Substances | p. 161 |
| Test Exponential Pile | p. 181 |
| Method of Operating a Neutronic Reactor | p. 217 |
| The Chain Fission Reaction | p. 223 |
| Neutron Loss by Absorption in Uranium | p. 226 |
| Neutron Loss by Absorption in the Moderator | p. 228 |
| Neutron Loss by Absorption by Impurities in the System | p. 229 |
| Exterior Neutron Loss in a Neutronic Reactor of Practical Size | p. 233 |
| Measurement of Neutron Losses | p. 234 |
| An Illustrative Neutronic Reactor having a Solid Moderator | p. 244 |
| Graphite in the Reactor | p. 258 |
| An Illustrative Neutronic Reactor having a Liquid Moderator | p. 262 |
| Neutronic Reactors with Other Moderators | p. 269 |
| Reduction of Losses Due to Resonance Capture | p. 271 |
| Reduction of Neutron Losses Due to Impurities in the Material | p. 278 |
| Effect of a Cooling System in a Neutronic Reactor | p. 285 |
| An Illustrative Gas-Cooled Neutronic Reactor | p. 288 |
| An Illustrative Liquid-Cooled Neutronic Reactor | p. 298 |
| Use of Different Lattices in the Same Neutronic Reactor | p. 303 |
| Critical and Operating Sizes of Neutronic Reactors | p. 307 |
| Control of the Neutronic Reaction by Variation of Neutron Losses in or from the Neutronic Reactor | p. 315 |
| Uses of Neutronic Reactors | p. 323 |
| Chain Reacting System | p. 329 |
| Neutronic Reactor I | p. 379 |
| Air Cooled Neutronic Reactor | p. 409 |
| Testing Material in a Neutronic Reactor | p. 447 |
| Neutron Velocity Selector | p. 475 |
| Neutronic Reactor II | p. 493 |
| Neutronic Reactor III | p. 513 |
| Neutronic Reactor IV | p. 523 |
| Method of Testing Thermal Neutron Fissionable Material for Purity | p. 535 |
| Method of Sustaining a Neutronic Chain Reacting System | p. 549 |
| Neutronic Reactor Shield | p. 583 |
| Other Documents not Reported in this Volume | p. 593 |
| The Complete List of Fermi's Papers | p. 621 |
| Bibliography | p. 653 |
| Index | p. 657 |
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