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Why does the cross section for neutron induced reaction increase with decreasing neutron energy?
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What is induced nuclear fission?
We might think of induced nuclear fission as a fission reaction that occurs when a neutron is captured by, say, a uranium-235 atom and that atomic nucleus undergoes fission as a result. Most all of the fission events within a nuclear reactor or nuclear weapon are induced. Given this, we might then compare that fission event to a spontaneous fission event wherein the atomic nucleus of a uranium-235 atom spontaneously undergoes fission without having captured a neutron.
In a nuclear fission reaction a freely moving neutron?
In a nuclear fission reaction, a freely moving neutron undergoes neutron capture and initiates the nuclear fission of a fuel atom.
What are the daughter atoms of uranium-235 during the initial chain reaction?
Fission is a form of nuclear transmutation because the resulting fragments are different elements from the original atom. A neutron-induced fission of U-235 results to krypton and barium.
What is the purpose of a reaction chamber in a nuclear reactor?
neutron absorber
How many neutrons are there when uranium 235 is bombarded with a neutron?
Uranium 235 has 143 neutrons; absorbing a neutron (neutron,gamma reaction) the isotope uranium-236 is obtained.
Name the element when uranium captures a fast neutron?
The element is determined by the number of protons. When uranium captures a fast neutron it is still uranium but has an increased atomic mass. Fast neutron capture may encourage a further reaction but it depends on which uranium isotope you start with as to the increase in probability some further reaction will occur and which reaction that might be.
What is induced nuclear fission?
We might think of induced nuclear fission as a fission reaction that occurs when a neutron is captured by, say, a uranium-235 atom and that atomic nucleus undergoes fission as a result. Most all of the fission events within a nuclear reactor or nuclear weapon are induced. Given this, we might then compare that fission event to a spontaneous fission event wherein the atomic nucleus of a uranium-235 atom spontaneously undergoes fission without having captured a neutron.
What did James chadwick do?
James chadwick was the discoverer of neutron. He gave the famous neutron reaction.
In a nuclear fission reaction a freely moving neutron?
In a nuclear fission reaction, a freely moving neutron undergoes neutron capture and initiates the nuclear fission of a fuel atom.
What is needed to get a reaction started?
A neutron.
Was James Chadwick?
James chadwick was the discoverer of neutron. He gave the famous neutron reaction.
What is the bullet that starts a fission reaction?
A neutron.
What must happen in order for a nuclear chain reaction to happen?
The number of neutrons existing in the critical core of the reactor must be steady or increasing, if it is decreasing the reaction will reduce and eventually stop. When a nucleus fissions (ie one of U-235) roughly 2.5 neutrons are produced, on average. Some of these are absorbed by the moderator and other incore materials, and some are lost at the core boundaries, but if for every nucleus that is fissioned, one neutron is then absorbed into another U-235 nucleus causing another fission, then the process will continue at a steady rate and we can call that a chain reaction. If there is a surplus of neutrons the population will increase and this could go on exponentially increasing, but this is contolled by the neutron absorbing control rods so that the neutron flux, or reactor power, is maintained at a steady level, for normal steady operation. In order for a nuclear chain reaction to take place, each nucleus must produce an average of one neutron that causes fission of another nucleus.
What are the daughter atoms of uranium-235 during the initial chain reaction?
Fission is a form of nuclear transmutation because the resulting fragments are different elements from the original atom. A neutron-induced fission of U-235 results to krypton and barium.
Substance produced by a chemical reaction?
phermones
Can annihilation of matter occur between a positron and neutron?
No, a positron cannot react with a neutron in any kind of annihilation reaction. An electron and a positron can, and the same with a neutron and an anti-neutron, but it does not occur between a positron and a neutron.
What is the purpose of a reaction chamber in a nuclear reactor?
neutron absorber
