Word: nuclei
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Dates: during 1950-1959
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...fissions (splits in two) and produces heat, it also yields free neutrons. Some of these are needed to keep the reaction going; they make other U-235 atoms split. Some neutrons escape or are absorbed by structural materials in the reactor. The rest of the neutrons enter the nuclei of U-238 atoms and make them turn into plutonium, which is just as fissionable as U-235 and can be used as atomic fuel...
...dropped into the clouds from planes and, by lowering the temperature of the air, creates small ice crystals or nuclei to which the water drops in the cloud cling. These drops then fall and melt into rain as they near the earth...
...silver iodide crystals are carried into the rain clouds by air currents from ground crystal generators. When the crystals reach the cloud, they serve as nuclei to which the water in the cloud adheres. The advantage of using the crystals is that they attract the water particles at a much higher temperature than the regular ice crystals...
...paper discussing "natural coordinate systems." His solution to a problem that was first propounded in 1900 by the great modern mathematician David Hilbert, is expected to provide a unified field theory between the forces operating within the universe as a whole and the forces within the nuclei of the atoms. Dr. Albert Einstein has been seeking such a theory for the past 30 years...
...method developed by Purcell and his group here will enable scientists to obtain new information on the structure of atomic nuclei, by measuring the very weak radio electromagnetic waves emit- ted by spinning sub atomic particles...