What Is Back Strain?

Reaction is a response caused by an event, such as: chemical reaction; optical reaction; reflection reaction; chain reaction; action and reaction (nuclear fission, nuclear fusion, etc.).

Chemical reaction

Chain reaction (or chain reaction , Chain reaction) refers to

Nuclear fusion , also known as nuclear fusion , fusion reaction, or fusion reaction , is a fusion of two lighter

Nuclear fission A smaller or atomic form of a nuclear reaction or radioactive decay. Nuclear fission was discovered in 1938 by scientists such as Lizer Meitner, Otto Hahn, and Otto Robert Frisch. Both the atomic bomb and the energy source of nuclear power plants are nuclear fission. Early atomic bombs were made from plutonium-239. Uranium-235 fission is most common in nuclear power plants.

After being hit by a neutron, a heavy nuclear atom splits into two lighter atoms, releases several neutrons at the same time, and releases photons in the manner of gamma rays. The released neutrons then hit other heavy nuclear atoms, forming a chain reaction and spontaneously splitting. In the fission of the nuclear, in addition to neutrons, heat is also emitted, and the energy used by nuclear power plants to generate electricity comes from this. Therefore, the binding energy of the nuclear fission product needs to be greater than that of the reactants.

Nuclear fission changes a chemical element into another chemical element, so nuclear fission is also a type of nuclear transition. The mass of the two atoms formed will be slightly different. In terms of common isotope of fissile material, the mass ratio of the two atoms is about 3: 2. Most nuclear fission will form two atoms, and occasionally there will be three atomic fission, called trisomy, which will occur about two to four times every thousand times. The smallest product formed between the proton and Argon between nuclei.

Modern nuclear fission is mostly intentional. Artificial nuclear reactions triggered by neutron collisions occasionally occur spontaneously. Nuclear fission due to radioactive decay does not require the initiation of neutrons, especially in some mass High isotope, the composition of its products is quite probabilistic and even chaotic. It is different from fission caused by quantum tunneling, such as proton emission, alpha decay, cluster decay, etc. These latter fission will produce the same product every time. Both the atomic bomb and the energy source of nuclear power plants are nuclear fission. Nuclear fuel refers to the release of neutrons when a material neutron impacts nuclear fission, so it can produce a chain reaction to make nuclear fission continue. In nuclear power plants, the rate of energy production is controlled at a smaller rate, while in the atomic bomb energy is released in a very fast and uncontrolled manner.

Since the number of neutrons released per nuclear fission is more than one, if the chain reaction is not controlled, the number of simultaneous nuclear fission will increase in a geometric series in a very short time. If there are enough heavy nuclear atoms gathered together, a large amount of energy will be released instantly. The atomic bomb applied this feature of nuclear fission. The heavy nuclear content used to make an atomic bomb needs to be above 90%.

The nuclear fuel used in nuclear power generation applications, uranium-235 content is usually very low, about 3% to 5%, so no nuclear explosion will occur. However, nuclear power plants still need to control the number of neutrons in the reactor to prevent accidents caused by core melting due to excessive power. Boron is usually added to the moderator of the reactor, and control rods are used to absorb neutrons in the fuel rods to control the rate of nuclear fission. All elements from cadmium can split.

During nuclear fission, most of the split neutrons are immediately released as soon as they are split, called instant neutrons, and a small part is released later (one to several tens of seconds), which is called delayed neutrons.

See nuclear fission for details. ^[4]