please I need some details about what is fermi golden rule in alfa particles wha
ID: 1896680 • Letter: P
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please I need some details about
what is fermi golden rule in alfa particles
what is fermi golden rule in optical transition
Explanation / Answer
> 3.4 Alpha Decay For heavy nuclei the binding energy per nucleon decreases with the number of nucleons; this opens the possibility to split a nucleus into two or more parts which have together a lower mass than the initial nucleus. One specific case of this type of nuclear decay is the alpha decay: the alpha particle is a He ? nucleus, consisting of two protons and two neutrons. As we can see in Figure 6 this nuclide has a fairly high binding energy per nucleon compared to the other light nuclei. A process where a nucleus emits an alpha particle (or we could say: is split in two nuclei whereby one of them is a nucleus) is called alpha decay. Such a decay is allowed if condition (3.2) is fulfilled, As before, this condition is equivalent to requiring that the Q-value be larger than zero. Atomic-scale spatial imaging of one-dimensional chains of silver atoms allows Fermi's golden rule, a fundamental principle governing optical transitions, to be visualized. We used a scanning tunneling microscope (STM) to assemble a silver atom chain on a nickel-aluminum alloy surface. Photon emission was induced with electrons from the tip of the STM. The emission was spatially resolved with subnanometer resolution by changing the tip position along the chain. The number and positions of the emission maxima in the photon images match those of the nodes in the differential conductance images of particle-in-a-box states. This surprising correlation between the emission maxima and nodes in the density of states is a manifestation of Fermi's golden rule in real space for radiative transitions and provides an understanding of the mechanism of STM-induced light emission.
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