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| the meeting of particles or of bodies in which each exerts a force upon the other, causing the exchange of energy or momentum |
| a device that produces a nearly parallel, monochromatic, coherent beam of light by exciting atoms to a higher energy level and causing them to radiate |
| slow neutron | |
| —n | |
| physics a neutron having a kinetic energy of less than 100 electronvolts | |
| slow neutron (slō) Pronunciation Key
A neutron that is in thermal equilibrium with the surrounding medium, especially one produced by fission in a nuclear reactor, and slowed by a moderator. The uranium 235 used in thermal nuclear reactors undergoes fission more readily when struck by slow neutrons than when struck by the fast neutrons released by fission. Also called thermal neutron. Compare fast neutron. |