596 Applications of Nuclear PhysicsQ45.7In a fusion reaction, the main idea is to get the nuclear forces, which act over very short distances, toovercome the Coulomb repulsion of the protons. Tritium has one more neutron in the nucleus, andthus increases the nuclear force, decreasing the necessary kinetic energy to obtain D–T fusion ascompared to D–D fusion.Q45.8The biggest obstacle is power loss due to radiation. Remember that a high temperature must bemaintained to keep the fuel in a reactive plasma state. If this kinetic energy is lost due tobremsstrahlung radiation, then the probability of nuclear fusion will decrease significantly.Additionally, each of the confinement techniques requires power input, thus raising the bar forsustaining a reaction in which the power output is greater than the power input.Q45.9Fusion of light nuclei to a heavier nucleus releases energy. Fission of a heavy nucleus to lighternuclei releases energy. Both processes are steps towards greater stability on the curve of binding
This is the end of the preview.
access the rest of the document.