Word: electrons
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Dates: during 1970-1979
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...LIQUID hydrogen explosion three alaram fire in the experimental chamber of the Cambridge Electron Accelerator yesterday injured eight Harvard and MIT scientists and research technicians, three of them critically. The multi-million dollar explosion ripped apart the entire roof of the circular experiment section of the CEA complex, severely damaged a $1,000,000 hydrogen bubble chamber, and destroyed an elevator shaft in the adjoining administrative section of the structure...
...potential hazards of the research--particularly the danger that the bacteria, once transplanted with foreign DNA, could induce disease and death in humans--the scientists want to perform the experiments in the Biological Laboratories, at 16 Divinity Ave., in a residential area. And, as was the case with the electron accelerator, the public has not participated in early decisions about recombinant DNA work that may later affect...
Died. Sir George Paget Thomson, 83, British physicist and chairman of the wartime committee that confirmed the feasibility of building an atomic bomb; in Cambridge, England. Thomson's father, Sir Joseph, discovered the electron in 1897 and won the Nobel Prize for Physics in 1906; 31 years later, Sir George shared the same prize for his work on the wavelike movement of electrons. After the war, Sir George became a strong advocate of international atomic energy control...
...generated by moving magnetic fields. But they could not solve one puzzle. Complete symmetry between electricity and magnetism meant that there must be a monopole-a basic magnetic particle of one pole, either north or south. It would, in effect, be the equivalent of the positive proton or negative electron that exists independently in nature. But all magnetized objects, from subatomic particles to giant electromagnets, seemed to have inseparable north and south poles. Broken into the tiniest segments, each piece remained a "dipole." No isolated north or south monopole could be found...
...with the newly developed tool of quantum mechanics. His calculations showed that there should indeed be a magnetic particle (or family of particles) that carries a basic magnetic charge-either north or south. That charge, said Dirac, would be 68.5 times as strong as the charge on an electron. Or it would be some multiple of 68.5-say, 137. Scientists had good reason to respect Dirac's reasoning. He had earlier predicted the existence of a positron, or positively charged counterpart of the electron. The positron was subsequently discovered during cosmic-ray experiments in 1932, but the monopole proved...