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<p>Atomic bombs and nuclear power Tags In a chain reaction, neutrons released in fission produce additional fissions, which in turn produces neutrons, and the process repeats. Critical. Define multiplication factors of reactor systems: Subcritical. Supercritical. () Define stages of nuclear chain reaction cycle. ∞ (four factor formula) Define finite medium system multiplication factor: keff(six factor formula) Describe differences in: One-Group, Two-Group, Multi Figure A typical set-up for a 4π experiment. By knowing the intensity of the beam, we can thus compute the differential cross section, differential in Tb, θb, and φb, presented here in thedifferent forms that one encounters in the literature. A isotope is capable of sustaining a neutron-induced  Chain Reactions and Nuclear Reactors Number of Neutrons per Fission Event, ν A quantity of key importance in establishing the possibility of a ﬁssion chain reaction is the  2 Introduction to Nuclear-Reaction Theorythe detector will be naturally proportional to the ﬂux F i of incoming particles and the number N of particles within the target: n = F i N σ. In water reactors, the coolant is also the moderator These two facts together can allow a chain reaction to occur. dσ(Tb, θb, φb) dσσ(Tb, θb, φb), dΩbdTb dΩbdTb In a chain reaction, neutrons released in fission produce additional fissions, which in turn produces neutrons, and the process repeats. Use a complex (absorptive) optical model potential – from Nuclear reactor basic principlesNeutron induced fission releases energy plus extra “fast” neutrons“Fast” neutrons are slowed down by a “moderator” such as water or graphite, allowing chain reaction to take place (rapid increase in neutron population). Define infinite medium system multiplication factor: k. This has been used to produce power from nuclear ssion as a lot of energy is released. If each neutron releases two or more neutrons,  Nuclear fission is a nuclear in which a neutron and nucleus interact with the result that the nucleus splits into two or more parts. If each neutron releases two or more neutrons, then the number of fissions doubles in each generation: This is exponential growth Direct reactions – requirements (3) Description of wave functions for scattering of nucleons or clusters from a heavier target and/or at higher energies: (a) high nuclear level density and broad overlapping resonances, (b) many open reaction channels, inelasticity and absorption.</p></translate>
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