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Prompt criticality - Wikipedia


In nuclear engineering, prompt criticality is said to be reached during a nuclear fission event if one or more of the immediate or prompt neutrons released by an atom in the event causes an addition...

Neutrons released in a fission reaction can strike other nuclei and ...


A chain reaction ... A chain reaction. ... Neutrons released in a fission reaction can strike other nuclei and cause? Neutrons released in a fission reaction can ...

Uranium-235 Chain Reaction - HyperPhysics


Form of Energy Released, Amount of Energy Released (MeV) ... If at least one neutron from each fission strikes another U-235 nucleus and initiates fission, then  ...

Energy from the Nucleus

electron6.phys.utk.edu/phys250/modules/module 5/nuclear_energy.htm

Nuclear energy can be produced by either of two types of reactions, fission, the splitting ... Energy Released per gram of Fuel (erg/gm) ... These free neutrons may strike other Uranium nuclei, causing further fission reactions. ... The result is that several other nuclei fission, and each of these cause several others to fission .

Fusion and Fission | S-cool, the revision website


Sep 28, 2015 ... If - on the other hand - the neutrons are allowed to strike other fissionable nuclei, further fissions can occur. ... If more than one fission inducing neutron on average is released, the result is an ... The key to controlling nuclear reactions is to produce just the right number of neutrons to cause a self-sustaining ...

Science Behind the Atom Bomb | Atomic Heritage Foundation


Fission occurs when a neutron strikes the nucleus of either isotope, splitting the ... This is known as a chain reaction and is what causes an atomic explosion. ... ensure that neutrons released by fission will strike another nucleus, thus producing a ... Powered by plutonium, Fat Man could not use the same gun-type design that .....

21.7 Nuclear Fission


Our discussion of the energy changes in nuclear reactions (Section 21.6) revealed an ... If one fission produces 2 neutrons, these 2 neutrons can cause two fissions. The 4 neutrons thereby released can produce four fissions, and so forth, ... they have the opportunity to strike another nucleus and cause additional fission.



Neutrons can only be produced in nuclear reactions, so what is needed is a nuclear ... Thus, the fission reaction releases heat, 50 million times as much heat as is ... one of them must strike another U-235 nucleus and cause a fission reaction.

PhET Simulation


Find and open the simulation called Nuclear Fission ... 1) What happens when the U-235 nucleus is “hit” with a neutron? ... happen here, describe all of them in as much detail as you can. ... Does this cause a chain reaction? ... No chain reaction takes place because no neutrons are released to continue the reaction.

Activity - NASA


Activity: Chain Reaction ... exerted continuously, will cause acceleration to grow very slowly," Kos says. "It's like .... neutrons can strike other nuclei, causing fission . ... continue to split, a significant amount of energy is released from the reaction.

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Fusion vs. Fission - Fusion Torch


If more 235U is present, those 2 neutrons can cause 2 more atoms to split. ... Animation of a chain reaction fissioning many 235U atoms ... When the nuclei fuse, they form a new element, and release excess energy in the form of a ... Nuclear fusion, on the other hand, requires that the fuel nuclei be moving very fast, or be ...

What is Fission? Definition & Facts about Nuclear Energy


Sep 19, 2012 ... An atom contains protons and neutrons in its central nucleus. ... it has been bombarded by other subatomic particles known as neutrinos. ... on to cause two separate reactions, each of which can cause at least two more. A single impact can jumpstart a chain reaction, driving the release of still more energy.

atomic bomb | fission device | Britannica.com


Apr 29, 2016 ... Sequence of events in the fission of a uranium nucleus by a neutron. Encyclopædia Britannica, Inc. Many isotopes of uranium can undergo fission, but uranium-235, ... say 0.45 kg (1 pound), cannot undergo a chain reaction and is thus ... chances that one of the released neutrons will cause another fission ...