fast fission

A research programme on isotope separation and fast fission was agreed upon.

No one has produced such a bomb, but Np-237's considerable fast fission cross section and low critical mass imply the possibility.

Boosting reduces diameter in three ways, all the result of faster fission:

Fast fission may produce higher yields.

Fast fission or fission of some heavier actinides will produce Cd at higher yields.

Yields are higher in fast fission or in fission of heavier nuclei.

Fast neutron reactors use fast fission to produce energy, unlike most nuclear reactors.

Another method is to bombard uranium-238 with fast neutrons to cause fast fission, which, among multiple reaction products, creates promethium-147.

Fast fission of uranium-238 provides a large part of the explosive yield, and fallout, in many designs of hydrogen bomb.

However, 77% of the final yield came from fast fission of the uranium tamper, which produced large amounts of radioactive fallout.

Fast fission of U-238 in the secondary stage of a nuclear weapon contributes greatly to nuclear weapon yield and to nuclear fallout.

Like the Mike, Bravo and Romeo tests, a large percentage of the yield was produced by fast fission of the natural uranium tamper.

Fast fission in a fast reactor or nuclear weapon, or fission of some heavy minor actinides like californium, will produce it at higher yields.

He crams organic material through his guts to oxidize it for energy when his solar cells, He-3 fusion plants, and fast fission reactors provide him many ,.

Fast fission is fission that occurs when a heavy atom absorbs a high-energy neutron, called a fast neutron, and splits.

TREAT has a fast-neutron hodoscope that collimates and detects fast fission neutrons emitted by experiment fuel sample.

BES-5 is an acronym for a Russian thermo-electric generator design in which the heat source is a U 235 fast fission nuclear reactor (FNR).

It is nonetheless possible to use this so-called fast fission in a fast reactor whose design minimises the moderation of the high-energy neutrons produced in the fission process.

In February 1940, Otto Frisch and Rudolf Peierls, working at the University of Birmingham in the UK, considered the possibility of fast fission in uranium-235.

Uranium-238 is fissionable by fast neutrons, but cannot support a chain reaction because inelastic scattering reduces neutron energy below the range where fast fission of one or more next-generation nuclei is probable.

Pressurized water reactors, like all thermal reactor designs, require the fast fission neutrons to be slowed down (a process called moderation or thermal) in order to interact with the nuclear fuel and sustain the chain reaction.

A report was produced in the same month by the Maud Committee, describing the importance of fast fission for bomb design and a copy was sent to the Uranium Committee in the U.S.

However, fast neutrons have a better fission/capture ratio for many nuclides, and each fast fission releases a larger number of neutrons, so a fast breeder reactor can potentially "breed" more fissile fuel than it consumes.

For thermal (slow-neutron) fission reactors, the typical prompt neutron lifetime is on the order of 10 seconds, and for fast fission reactors, the prompt neutron lifetime is on the order of 10 seconds.

Moderators may absorb a lot of neutrons in a thermal reactor, and fast fission produces a higher average number of neutrons per fission, so fast reactors have better neutron economy making a plutonium breeder reactor possible.