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59

The answer is in wikipedia The photograph on the right shows two unusual phenomena: bright spikes projecting from the bottom of the fireball, and the peculiar mottling of the expanding fireball surface. The surface of the fireball, with a temperature over 20,000 kelvin, emits huge amounts of visible light radiation (more than 100 times the intensity ...

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I don't have any special knowledge about this image or nuclear testing, but typically when we see an asymmetry in the evolution of a system, there should be an asymmetry in the laws governing it, or the initial conditions$^†$. There are three asymmetries that I can think of in the system that could explain the asymmetry in the evolution of the system. ...

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As you say, in absence of moderator, light water in PWR, neutrons cannot reach thermal energy, no fission on uranium-235 appears, reactor begins not critical and it stops. For a neutron point of view, it is the same situation like scramming control rods.

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Basically Fission Bomb efficiency depends significantly on the neutron flux intensity before it blows itself apart hence the elements to be considered are the mechanism used to achieve supercritical mass the “neutron boosting” strategy Regarding the critical mass generation mechanism as far as I can remember Little Boy’s used a gun type one and it ...

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The mass defect and the binding energy are not linear functions of the number of nucleons. They increase until the iron and then decrease. See the Figure 31-5 of The Mass Defect of the Nucleus and Nuclear Binding Energy The thorium Mass Defect for one Average Nucleon ( MDAN ) is higher than an uranium MDAN. Uranium decays in thorium and alpha particle ...

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