## The Story of SpinAll atomic particles have a particular "spin," analogous to the earth's rotation on its axis. The quantum mechanical reality underlying spin is complex and still poorly understood. Sin-itiro Tomonaga's The Story of Spin remains the most complete and accessible treatment of spin, and is now available in English translation. Tomonaga tells the tale of the pioneers of physics and their difficult journey toward an understanding of the nature of spin and its relationship to statistics. His clear unfolding of the tale of spin is invaluable to students of physics, chemistry, and astronomy, and his description of the historical development of spin will interest historians and philosophers of science."This piece of the history of physics will provide excellent and exciting reading. . . . It also provides the personal touch of an expert in the field that is so often lacking in the physics literature. I recommend it very highly."—Fritz Rohrlich, Physics TodaySin-itiro Tomonaga was awarded the Nobel Prize for Physics in 1965. |

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This book does presume a fairly high level of knowledge of quantum mechanics, but is a great exposition of the history of the development of ALL quantum mechanics. The reader will delight in the story behind so much we had to simply take for granted in the usual treatment of quantum mechanics in undergraduate course.

One of the delights is that we get a much better picture from this book than from class about how even the great physicists stumbled quite a bit with failures like the "Ersatzmodel" before they finally hit on the right idea: 'spin' and the 'spinor'.

### Contents

Before the Dawn | 1 |

Electron Spin and the Thomas Factor | 24 |

Paulis Spin Theory and the Dirac Theory | 43 |

Proton Spin | 63 |

Interaction between Spins | 78 |

PauliWeisskopf and the Yukawa Particle | 95 |

The Quantity Which Is neither Vector nor Tensor | 113 |

Spin and Statistics of Elementary Particles | 131 |

The Year of Discovery 1932 | 150 |

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### Common terms and phrases

alkali antisymmetric axis Bohr boson calculation classical commutation relation components consider coordinate system core covariant quantities degree of freedom derived deuteron Dirac equation discovery discussed doublet term Ehrenfest eigenfunction eigenvalues electron spin elementary particles energy Ersatzmodell exchange force experimental external magnetic field Fermi fermion field equation figure formula Furthermore Goudsmit Hamiltonian Heisenberg Hund idea interaction interchange isospin Klein Klein-Gordon equation Kronig Lande's lecture Lorentz transformation magnetic field matrix matrix mechanics mechanical system meson multiplet neutron nuclear force nucleons nucleus obtain orbital angular momentum paper Pauli Pauli equation Phys physical quantity probability amplitude problem Professor Nishina proper coordinate axes proton quantized quantum mechanics quasi-parallel radiant electron relativistic respect rest system result right-hand side rotation satisfy scalar self-rotating electron Sin-itiro Tomonaga singlet Sommerfeld's specific heat spin and statistics spinor splitting symmetric tensor Thomas factor told you earlier Tomonaga triplet Uhlenbeck vector wave function Yukawa Zeeman effect