Word: electrons
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Dates: during 1930-1939
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...comparatively young man (he is 32), amiable, dimple-chinned Dr. Carl David Anderson of California Institute of Technology has accomplished a great deal in science. In 1932 he snapped the first picture of a positive electron. For this discovery he won the highest honor Science can bestow, a Nobel Prize. His pioneer positive electron photograph has become historic. In the Physical Review last week, Prizeman Anderson printed a snapshot of another kind of particle which may also become historic...
...existence of "heavy electrons," also known as X-particles or barytrons, was suspected by Anderson and his co-workers in 1934, and later discovered almost simultaneously by him and Drs. Jabez Curry Street & Edward Stevenson of Harvard. These queer little particles appear to originate about ten miles above the earth's surface as a result of collisions between primary cosmic ray particles and air atoms. Calculations of their mass have yielded figures from 110 to 400 times the weight of an ordinary electron...
...Anderson's analysis of the photograph (see cut) is as follows: the particle, weighing 240 electron units, enters the chamber near the upper left-hand corner of the picture, making a thin, sketchy white track which is slightly curved owing to a strong magnetic field maintained across the chamber. Its energy is 10,000,000 electron-volts. It passes through a copper cylinder (left centre) and emerges below, much weaker and making a broader line. Its energy is now only 210,000 volts and so its path is more sharply bent by the magnetic field. After traveling about...
Evidence which does not appear clearly in the picture convinced Dr. Anderson that at the end of its trail the particle disintegrated by the emission of a positive electron...
...electron-volt is the energy acquired by an electron to which a force of one volt is applied...