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Namely [there is] the possibility that there could exist in the nuclei electrically neutral particles that I wish to call neutrons, [b] which have spin 1 / 2 and obey the exclusion principle, and additionally differ from light quanta in that they do not travel with the velocity of light: The mass of the neutron must be of the same order ...
It took four researchers two weeks of 18-hour days to produce the film. [6] The graphics and sound effects resemble those of early video games. "This movie is a fun way to share the atomic-scale world," said project leader Andreas J. Heinrich. "The reason we made this was not to convey a scientific message directly, but to engage with students ...
In the Standard Model, all the elementary fermions have spin 1/2, and are divided into the quarks which carry color charge and therefore feel the strong interaction, and the leptons which do not. The elementary bosons comprise the gauge bosons (photon, W and Z, gluons) with spin 1, while the Higgs boson is the only elementary particle with spin ...
By contrast, strongly interacting particles like slow electrons and molecules require vacuum: the matter wave properties rapidly fade when they are exposed to even low pressures of gas. [67] With special apparatus, high velocity electrons can be used to study liquids and gases. Neutrons, an important exception, interact primarily by collisions ...
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A primordial black hole with an initial mass of around 10 12 kg would be completing its evaporation today; a less massive primordial black hole would have already evaporated. [1] Under optimal conditions, the Fermi Gamma-ray Space Telescope satellite, launched in June 2008, might detect experimental evidence for evaporation of nearby black ...
The prevailing model of atomic structure before Rutherford's experiments was devised by J. J. Thomson. [1]: 123 Thomson had discovered the electron through his work on cathode rays [2] and proposed that they existed within atoms, and an electric current is electrons hopping from one atom to an adjacent one in a series.
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