Titlebook: Neutron Physics; K. H. Beckurts,K. Wirtz Book 1964 Springer-Verlag Berlin Heidelberg 1964 Cross section.diffusion.fields.neutron.nuclear p

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Slowing-Down Parameters region. By far the most important of these experiments are the stationary ones for determining the mean squared slowing-down distance (Sec. 16.1) since this quantity enters directly into reactor calculations. In addition, comparison of measured and calculated mean squared slowing-down distances all

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Investigation of the Diffusion, Absorption, and Thermalization of Neutrons by Non-Stationary Methodsr and more accurate measurements than stationary methods and because they also give much deeper insight into the physical nature of the problems. This conclusion is especially true for the method of pulsed sources, whose great potentialities were first recognized by von Dardel and which has since be

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Measurement of Cross Sectionser, average values in a well-defined spectrum (Maxwellian spectrum of thermal neutrons, 1/.spectrum, fission spectrum) are measured. In later chapters, various . methods for determining cross sections which are based on the interaction of a substance with a neutron field will be discussed in detail.

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Neutron Fieldsium with the thermal motion of their surroundings. Their energies then assume, or at least approximate, a thermal distribution. Neutrons with such an energy distribution are called “thermal neutrons”.

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Applications of Elementary Diffusion Theoryy are well fulfilled ; as long as we stay one or two mean free paths away from boundaries and sources, the results of diffusion theory will be quite accurate. We specifically assume that the neutron sources emit neutrons with a thermal energy distribution.

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Thermalization of Neutronsl. In doing so, we shall strive to connect the theory of the thermalization process with the theory of the slowing-down process that was previously developed for energies greater than about 1 ev on the basis of collisions with free, stationary nuclei.