![]() ![]() ![]() When a large nucleus splits into pieces, excess energy is emitted as gamma rays and the kinetic energy of various ejected particles ( nuclear fission products). This energy may be made available as nuclear energy and can be used to produce electricity, as in nuclear power, or in a nuclear weapon. If new binding energy is available when light nuclei fuse ( nuclear fusion), or when heavy nuclei split ( nuclear fission), either process can result in release of this binding energy. The term "nuclear binding energy" may also refer to the energy balance in processes in which the nucleus splits into fragments composed of more than one nucleon. This 'missing mass' is known as the mass defect, and represents the energy that was released when the nucleus was formed. The difference in mass can be calculated by the Einstein equation, E = mc 2, where E is the nuclear binding energy, c is the speed of light, and m is the difference in mass. The mass of an atomic nucleus is less than the sum of the individual masses of the free constituent protons and neutrons. Both the experimental and theoretical views are equivalent, with slightly different emphasis on what the binding energy means. In this context it represents the energy of the nucleus relative to the energy of the constituent nucleons when they are infinitely far apart. In theoretical nuclear physics, the nuclear binding energy is considered a negative number. Nucleons are attracted to each other by the strong nuclear force. The binding energy for stable nuclei is always a positive number, as the nucleus must gain energy for the nucleons to move apart from each other. Nuclear binding energy in experimental physics is the minimum energy that is required to disassemble the nucleus of an atom into its constituent protons and neutrons, known collectively as nucleons. ![]()
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