What is nuclear fission?
Nuclear fission defitintion and examples?
Nuclear fission defitintion and examples are listed below.
Fission is the division of an atomic nucleus into two or more lighter nuclei accompanied by a release of energy . The original heavy atom is called the parent nucleus and the lighter nuclei are daughter nuclei. Fission is a type of nuclear reaction that can occur spontaneously or as a result of a particle hitting an atomic nucleus.
The reason for fission is that the energy disturbs the balance between the electrostatic repulsion between the positively charged protons and the strong nuclear force that holds the protons and neutrons together. The nucleus oscillates, so that repulsion can overcome the attraction at close range, causing the atom to split.
The change in mass and the release of energy produce smaller nuclei which are more stable than the original heavy nucleus. However, the daughter nuclei can still be radioactive. The energy released by nuclear fission is considerable. For example, fission of one kilogram of uranium releases as much energy as burning about four billion kilograms of coal.
Energy is necessary for fission to occur. Sometimes this is provided naturally, from the radioactive decay of an element. Other times, energy is added to a nucleus to overcome the nuclear binding energy that holds the protons and neutrons together. In nuclear power plants, energy neutrons are directed into a sample of the uranium-235 isotope . Neutron energy can cause the uranium nucleus to rupture in a number of ways. A common fission reaction produces barium-141 and krypton-92. In this particular reaction, a uranium nucleus decomposes into a barium nucleus, a krypton nucleus and two neutrons. These two neutrons can then split other uranium nuclei,
The question of whether a chain reaction can occur depends on the energy of the released neutrons and the proximity of the neighboring uranium atoms. The reaction can be controlled or moderated by introducing a substance that absorbs neutrons before they can react with more uranium atoms.
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