Introduction

This introduction introduces the notations used throughout this book and describes certain concepts and facts from various fields of physics which form the basis of subsequent analysis. It provides an experimental situation typical for the study of interaction of particles with nuclei, especially at intermediate energies. Intermediate forms, which are sometimes called "semi-inclusive" or "semi-exclusive," are also widely used for description of NRs at intermediate energies, since the inclusive description often does not carry sufficient information. In addition to topological cross-sections, such forms include functions of all kinds of correlations of the emission of particles with respect to the composition, energy and angles, e.g., the function of the energy-angle correlation of the emission of two nucleons used to separate the contribution of a quasifree knockout of nucleons. In the domain of intermediate energies, a quasifree knockout of nucleons from a nucleus is one of the principal inelastic processes in NA-interactions.