A generic two-body nuclear reaction with target nucleus at rest. Chap 15) for a general reaction depicted in Fig. We recall the Q-equation introduced in the study of neutron interactions (cf. ![]() Energetics 1 Before discussing the compound nucleus model we first summarize the energetics of nuclear reactions. Today, we will continue our series by discussing fission. That heat is used to make steam that spins a turbine to create electricity. How do basic nuclear fission reactions work A nuclear physics 100-level class would teach the distinction between fission and fusion reactions: Nuclear fission is dividing a nucleus into smaller parts, while nuclear fusion is combining smaller parts to build a new, larger nucleus. They contain and control nuclear chain reactions that produce heat through a physical process called fission. In contrast, the optical model, which we will not discuss in this course, is good for gross behavior of the cross section (in the sense of averaging over an energy interval). NUCLEAR 101: How Does a Nuclear Reactor Work APS Nuclear reactors are the heart of a nuclear power plant. As we will see, this approach is well suited for describing reactions which show single resonance behavior, a sharp peak in the energy variation of the cross section. Since we have already examined the nuclear shell model is some detail, we will focus in the brief discussion here on the compound nucleus model, which in some sense may be considered to be in the same class as the liquid drop model. Each model describes well some aspects of what we now know about nuclear structure and reactions, and not so well some of the other aspects. Chap 9), and a model with a complex potential, known as the optical model, proposed by Feshbach, Porter and Weisskopf (1949). A well-known example of the former is the liquid drop model, and three examples of the latter are a model proposed by Bethe (1940), the nuclear shell model with spin-orbit coupling (cf. ![]() ![]() These are (i) the compound nucleus model proposed by Bohr (1936) in which the incident particle interacts strongly with the entire target nucleus, and the decay of the resulting compound nucleus is independent of the mode of formation, and (ii) the independent particle model in which the incident particle interacts with the nucleus through an effective averaged potential. Among the many models of nuclear reactions there are two opposing basic models which we have encountered.
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