It would make a chain reaction less likely. A high density is needed to maintain a chain reaction. The flat pancake does not have the right shape as neutrons will be able to pass through with only a very low probability of hitting a nucleus.
The burning and exploding of uranium are entirely different processes.uranium burns by ordinary chemical oxidation, in fact uranium reacts with oxygen so easily that it is called a pyrophoric material: shavings or dust will suddenly spontaneously combust with no warning whatsoeveruranium in a nuclear bomb explodes by an exponentially increasing fission chain reaction in a supercritical mass
Yes, a supercritical mass of fissile material such as uranium or plutonium can accelerate until a nuclear explosion occurs. When the mass reaches a critical point, a rapid chain reaction takes place, releasing a large amount of energy in the form of heat and pressure, resulting in an explosion.
1. Yes, all coals contain traces of uranium. 2. Uranium is not combustible; the "burning" of uranium in nuclear reactors is a nuclear reaction, not a reaction with oxygen.
With conventional explosives to assemble a supercritical mass before it can begin a spontaneous chain reaction, melt and fizzle. Then a neutron source sprays the supercritical mass with a burst of neutrons at the optimal time to trigger a high efficiency chain reaction. The conventional explosives were detonated with electrical exploding wire detonators.
A nuclear fission reaction.
The nuclear fission of uranium is a reaction with neutrons.
Mainly because only about 0.7% of uranium is the isotope uranium-235, which is easily fissionable. It is believed that in Earth's remote past, there were such chain reactions - natural reactors - at a time when the percentage of U-235 was higher.
Any reaction.
Uranium
Uranium metal (enriched in uranium-235 up to 99 %) is a nuclear explosive, if the critical mass is reached. Also criticality accidents are possible in uranium plants or uranium storage areas.
The element is determined by the number of protons. When uranium captures a fast neutron it is still uranium but has an increased atomic mass. Fast neutron capture may encourage a further reaction but it depends on which uranium isotope you start with as to the increase in probability some further reaction will occur and which reaction that might be.
Nuclear fuel rods contain uranium pellets for the fission reaction. The uranium pellets undergo a controlled chain reaction in a nuclear reactor, releasing heat energy that is used to generate electricity.