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Binding energy
Intermediate
Energy released forming the nucleus.
E_b = Δm c²E_b = Δm c², the energy needed to split a nucleus into nucleons. Helium-4: 28.3 MeV.
1 u of mass defect = 931.5 MeV.
Higher binding energy per nucleon means more stable.
In more detail
Binding energy is the energy needed to separate a nucleus into its nucleons, and it equals the mass defect times c squared. It indicates how tightly the nucleus is held together.
Real-world uses
- Nuclear physicists compare binding energies of different isotopes.
- Energy released in reactions is found from binding energy differences.
- Engineers designing nuclear reactors estimate the energy released by fission from the binding energy difference.
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Frequently asked questions
What is a typical binding energy?
Several megaelectronvolts per nucleon for most stable nuclei.
Why does binding energy matter for power?
Changes in binding energy release large amounts of energy in fission and fusion.
What does binding energy mean?
The energy needed to pull a nucleus apart into its individual protons and neutrons, which equals the energy released in forming it.
Related topics in Atomic & Nuclear Physics
Nuclear size · Nuclear density · Mass defect · Binding energy per nucleon · Nuclear force · Radioactivity discovery