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| 释义 | 中子 About80 percent of the fusion energy released is in the form of those neutrons, so the reaction isn't very healthy or useful for a starship. However, it does have one neutron. Again, the target is to take all these energies and slow the neutrons down to the thermal spectrum so that they can be an efficient fission producer. Or it can have a collision that can create a fission neutron which then is tracked as well as the start of a fission which may be in a quite different place. Quarks are the constituents of protons and neutrons, as well as more exotic things. The ideal nanocomposite would not only resist radiation damage. It would also not itself become radioactive by absorbing neutrons. Each proton or neutron has about two thousand times the mass of an electron. And that you can appropriately slow down the neutrons by scattering them with an appropriate moderator such that they're not lost or absorbed. And if you keep these neutrons from escaping through leakage they then become available to become absorbed in uranium238. With a pile more money, you can cut the proton and neutrons into their smallest parts, quarks, you will still have magnets with North and South poles. Graphite is a great moderator, slowing down the neutrons and keeping their reaction in the proper temperature range. So if we wanna know the rate of change of neutrons as a function of time we will write this expression. So if you understand this chart you will begin to appreciate the life of a neutron in the reactor core. So we're looking only for the neutrons at energy E from this spectrum. So we get at the number of neutrons indirectly because we know the proton number here. So this is the fundamental equation that we can write that describes how neutrons in fact do accumulate. We also produce neutrons. Now, because we're only interested in those neutrons that end up with this energy going in our direction. Now in the Boltzmann Equation we wanna track neutrons so we need to take the flux and divide it by the velocity. Now, this slide is an interesting slide because it shows you what happens when a neutron is born as a result of fission. When a neutron inside an atom decays, it produces a proton, an electron, and a neutrino. In terms of neutron loss mechanisms which are which can be significant, these are some parameters that one could compare. As the universe expanded and cooled, some of these particles merged to form neutrons and protons. This means you can vary the neutron number without changing chemical identity, because chemical identity is fixed by the proton. This chart gives you a summary of some of the critical thermal- neutron cross sections of important fissile and fertile nuclides. The process releases a lot of energy and more neutrons, which go on to split other uranium atoms, triggering a chain reaction. Ultimately ending up with a group of thermalized neutrons that also have a certain probability of leakage from the reactor. Half section view of an ultracold neutron trapping apparatus. |
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