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Thermal neutronA thermal neutron is a free neutron with a kinetic energy level of less than 0.025 eV (approx. 4.0e-21 J). They are named 'thermal' as this level of kinetic energy is similar to the average kinetic energy of a room-temperature gas.Thermal neutrons have a much larger effective cross-section than fast neutrons, and can therefore be absorbed more easily by any atomic nuclei that they collide with, creating a heavier - and often unstable - isotope of the element as a result. 
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Thermal neutron".