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You are probably referring to nuclear fission. this occurs in some isotopes of heavy elements, most notably Uranium 235 and Plutonium 239. The fission of the nucleus releases energy, and forms two fragments which are nuclei of two lighter elements. The reaction can be controlled to occur at a steady rate thus releasing a steady supply of thermal energy.
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What is the bullet that starts a fission reaction?
A neutron.
Is neutron particle is required both to start and as a product in a fissin reaction?
Yes. That's how the reaction is self-sustaining: The product of one reaction is the reactant for the next.
What are the various differences between a stable and an unstable nuclei?
The nuclei of a stable radioactive isotope will after been bombarded with a neutron produce a radiation and enormous energy and such reaction will come to an end, while the nuclei of an unstable nuclei will continue to react with little fragment of the neutron continuously (long chain nuclear reaction) until it has attain it stable phase.mind you this reaction with the little fragment of this neutron can last over 10 years.
What is meant by supercritical andhow dose it relate to making a nuclear bomb?
subcritical - a mass or arrangement of fissionable or fissile material unable to sustain a neutron chain reaction. It can provide a fixed amount of neutron multiplication from a neutron source, but after removal of the neutron source the chain reaction rate drops exponentially.critical - a mass or arrangement of fissionable or fissile material capable of sustaining a constant neutron chain reaction. No increase or decrease. (Nuclear reactors operate at critical)supercritical - a mass or arrangement of fissionable or fissile material capable of not only sustaining a neutron chain reaction, but once initiated the chain reaction rate rises exponentially. (Nuclear fission bombs explode when made supercritical)A nuclear fission bomb must have 2 of these states: subcritical (so that it can't explode until desired) and supercritical (so that it explodes with an effective yield). This requires a rapid "assembly" system using conventional explosives to rearrange the fissile material from subcritical to supercritical in about 1ms. A neutron source starts the chain reaction and the explosion completes in about 1 microsecond.
How can the rate of reaction be slowed down in a nuclear fission reactor?
By inserting the control rods which absorb neutrons using boron, cadmium, or other material with a large neutron capture crosssection. If the reactor should begin to run out of control the SCRAM system will suddenly insert large amounts of neutron absorbing material, instantly stopping the neutron chain reaction.
What did James chadwick do?
James chadwick was the discoverer of neutron. He gave the famous neutron reaction.
In a nuclear fission reaction a freely moving neutron?
In a nuclear fission reaction, a freely moving neutron undergoes neutron capture and initiates the nuclear fission of a fuel atom.
What is needed to get a reaction started?
A neutron.
Was James Chadwick?
James chadwick was the discoverer of neutron. He gave the famous neutron reaction.
What is the bullet that starts a fission reaction?
A neutron.
Substance produced by a chemical reaction?
phermones
Can annihilation of matter occur between a positron and neutron?
No, a positron cannot react with a neutron in any kind of annihilation reaction. An electron and a positron can, and the same with a neutron and an anti-neutron, but it does not occur between a positron and a neutron.
What is the purpose of a reaction chamber in a nuclear reactor?
neutron absorber
How many neutrons are there when uranium 235 is bombarded with a neutron?
Uranium 235 has 143 neutrons; absorbing a neutron (neutron,gamma reaction) the isotope uranium-236 is obtained.
What kind of decay is it when a nuclear reaction in which a neutron is transformed into a proton and in electron?
When a neutron -> proton, it is called a Beta - (minus) decay.
What does initiation of nuclear weapons mean?
starting the fission neutron chain reaction using some kind of pulsed neutron source.
What accomplishes the release of the nuclear energy in a reactor?
neutron chain reaction
