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This second Series A volume of Werner Heisenberg's Collected Works covers a period of about 15 years beginning with the early papers on quantum field theory in 1929/30 and ending with those on the scattering matrix (up to 1946). The reader will find Heisenberg contributions to Dirac's theory of the electron, to nuclear physics, to cosmic ray phenomena, and to reactor physics. The papers on the Uranium Project, classified for a long time and never fully published before, will certainly attract a wide audience. As in the first volume, each group of papers is furnished with an...

This book is based upon a series of lectures I have occasionally given at the University of Gottingen since 1951. They were meant to introduce the students of experimental physics to the work in a neutron physics laboratory dealing with the problem of measuring neutron flux, diffusion length, Fermi age, effective neutron temperature, absorption cross sections and similar problems. Moreover, these lectures were intended to prepare the students for a subsequent lecture covering the physics of nuclear reactors. The original character of this series of lectures has been retained in the book. It...