The unstable nucleus is more stable following the emission, but will sometimes undergo further decay.
2.
His argument was that, under certain circumstances, a repeatedly measured system, such as an unstable nucleus, would be prevented from decaying by the act of measurement itself.
3.
This decay, called spontaneous fission, happens when a large unstable nucleus spontaneously splits into two ( and occasionally three ) smaller daughter nuclei, and generally leads to the emission of gamma rays, neutrons, or other particles from those products.
4.
Fermi thought that this, coupled with his knowledge of beta decay, whereby an unstable nucleus attempts stabilisation by converting one neutron to a proton and ejecting a newly formed electron, would result in an element with one extra proton than uranium : element 93.
5.
The origin of the ray differentiates them, gamma rays tend to be a natural phenomena originating from the unstable nucleus of an atom and X-rays are electrically generated ( and hence man-made ) unless they are as a result of bremsstrahlung X-radiation caused by the interaction of fast moving particles ( such as beta particles ) colliding with certain materials, usually of higher atomic numbers.
6.
This practice is useful for other reasons, too : stripping all the electrons from a heavy unstable nucleus ( thus producing a bare nucleus ) changes the lifetime of the nucleus, indicating that the nucleus cannot be treated independently ( Experiments at the heavy ion accelerator orbital models of heavy atoms, the electron orbits partially inside the nucleus ( it doesn't " orbit " in a strict sense, but has a non-vanishing probability of being located inside the nucleus ).
7.
Wobble that unstable nucleus a bit, and suddenly it is two very positively charged nuclei just outside the range of the strong nuclear force, which repel violently . ( Most of the energy released by a fission reaction is in from this repulsion and is kinetic . ) Nuclear fusion, by contrast, is hard to make work because you have to get two positively charged nuclei ( repelling each other like mad ) just close enough so that the strong nuclear force can kick in .-- talk ) 20 : 44, 1 October 2010 ( UTC)
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