Nuklearna fisija – razlika između verzija

Nuklearna fisija se može odvijati bez [[neutron]]skog bombardovanja, kao tip [[radioaktivni raspad|radioaktivnog raspada]]. Ovaj tip fisije (takazvana [[spontana fisija]]) je redak izuzev u slučaju nekoliko teških izotopa. U nuklearnim uređajima, esencijalno sva nuklearna fisija se odvija kao "[[nuklearna reakcija]]" — bombardovanjem vođeni proces koji proizilazi iz kolizije dve subatomske čestice. U nuklearnim reakcijama, subatomska čestica se sudara sa atomskim jezgrom i uzrokuje promene u njemu. Nuklearne reakcije su stoga vođene mehanikom bombardovanja, ne samo relativno konstantnim [[eksponencijalni raspad|eksponencijalnim raspadom]] i [[polu-život]]om karakterističnim za spontane radioaktivne procese.

 

 

 

Nuclear fissions in fissile fuels are the result of the nuclear excitation energy produced when a fissile nucleus captures a neutron. This energy, resulting from the neutron capture, is a result of the attractive [[nuclear force]] acting between the neutron and nucleus. It is enough to deform the nucleus into a double-lobed "drop," to the point that nuclear fragments exceed the distances at which the nuclear force can hold two groups of charged nucleons together, and when this happens, the two fragments complete their separation and then are driven further apart by their mutually repulsive charges, in a process which becomes irreversible with greater and greater distance. A similar process occurs in [[fissionable]] isotopes (such as uranium-238), but in order to fission, these isotopes require additional energy provided by [[fast neutron]]s (such as those produced by [[nuclear fusion]] in [[thermonuclear weapons]]).