supercritical mass造句

• So what exactly are the mechanism that prevent a " simple " prompt supercritical mass from exploding?
• The first task of a nuclear weapon design is to rapidly assemble a supercritical mass of fissile uranium or plutonium.
• :What I heard was that the energy released effectively blows the supercritical mass apart enough that it is no longer supercritical.
• Uranium is slower to fission, so it can be assembled into a more supercritical mass, allowing higher yield of the weapon.
• In effect, a supercritical mass doesn't stay supercritical very long; the more supercritical it is, the faster it blows itself apart.
• In comparison, the time for physical reactions such as turning moderator water into steam, or physically blowing up the supercritical mass, seem higher.
• Once a supercritical mass is assembled, any of these events could trigger a detonation . talk ) 20 : 00, 30 April 2010 ( UTC)
• This, along with other subsystems of the weapon keep the supercritical mass together long enough for sufficient generations of the fission reaction to produce the desired yield.
• In a fizzle the warhead blows itself apart too fast for the nuclear reactions to generate a large amount of energy, or fails to form a supercritical mass for some other reason.
• "' Gun-type fission weapons "'are supercritical mass by the use of the " gun " method : shooting one piece of sub-critical material into another.
• A supercritical mass is one in which the percentage of fission-produced neutrons captured by another fissile nucleus is large enough that each fission event, on average, causes more than one additional fission event.
• On firing the weapon, small to moderate amounts of high explosive collapse and slightly reshape the nuclear material into a supercritical mass which then begins a chain reaction, goes critical, and explodes in a small nuclear blast.
• Once the supercritical mass was assembled the presence of an atmosphere ( which is a mere will-o-the-wisp compared to the extraordinary temperatures and pressures achieved in a nuclear detonation ) makes essentially no difference to the bomb itself.
• In discussions on the A-bomb, there is generally an argument being made that one has to use high explosives to get the prompt supercritical mass for explosion, otherwise the excursion will be terminated before a huge amount of energy is released.
• "' Gun-type fission weapons "'are fission-based nuclear weapons whose design assembles their fissile material into a supercritical mass by the use of the " gun " method : shooting one piece of subcritical material into another.
• This process increases the density and temperature of the deuterium to the level needed to sustain a thermonuclear reaction, and compress the sparkplug to a supercritical mass-Inducing the sparkplug to undergo nuclear fission, to start a fusion reaction in the surrounding deuterium fuel.
• :Is it possible to speculate that if it is possible to compute the portion of the supercritical mass that undergoes fission, then let only that portion be fissionable, the rest be some sort of filler material, so as to make the entire fissionable material to undergo fission.
• If the perfect quantity of fuel were added to a slightly subcritical mass, to create a barely supercritical mass, the temperature of the assembly would increase to an initial maximum ( for example : 1 K above the ambient temperature ) and then decrease back to the ambient temperature after a period of time, because fuel consumed during fission brings the assembly back to subcriticality once again.