Search Details

Word: nuclei (lookup in dictionary) (lookup stats)
Dates: during 1970-1979
Sort By: most recent first (reverse)


Usage:

Fusion, on the other hand, requires extreme pressure and temperatures as high as 100 million degrees. Under these conditions, the nuclei of light atoms are energized (or speeded up) enough so that they can overcome their mutually repulsive electrical charges, collide and fuse. In the hydrogen bomb, the necessary pressures and temperatures are produced by first setting off a fission explosion. Controlling and containing fusion will be vastly more difficult, but scientists believe that the Russian-invented Tokamak (for "Toroidal Kamera Magnetic") system can be developed into a practical and safe reactor...

Author: /time Magazine | Title: Science: A Doughnut for Power | 2/17/1975 | See Source »

...made even hotter by an electric current generated inside it by another magnetic field and by a beam of deuterium atoms shot into it. These combined effects should raise temperature and pressure high enough in about a tenth of a second to begin fusion of the deuterium and tritium nuclei. The scientists' major goal: to come close to producing as much fusion energy during one of these periods as is used to power the Tokamak during the same time...

Author: /time Magazine | Title: Science: A Doughnut for Power | 2/17/1975 | See Source »

Physicists have already discovered some 200 elementary particles, usually by smashing apart nuclei of atoms in huge accelerators. Most of the particles live for only a tiny fraction of a second before they decay into more stable atomic components Like electrons. Until now, all of these particles have occupied predictable places in what physicists jocularly call their subnuclear "zoo." The puzzling new discovery is a total misfit...

Author: /time Magazine | Title: Science: Enlarging the Zoo | 12/2/1974 | See Source »

...Berkeley team led by Physicist Albert Ghiorso and Chemist Glenn Seaborg, the former Atomic Energy Commission chairman who won a Nobel Prize for synthesizing element No. 94 (plutonium). The Berkeley scientists used a newly beefed-up particle accelerator called Super-HILAC (for heavy ion linear accelerator) to send nuclei of oxygen atoms barreling into another artificial element, californium. As occasional collisions occurred between the oxygen and californium nuclei, they fused and formed the heavier nucleus of element 106-but not for long. Like most artificial elements, No. 106 is extremely unstable. It has a half-life of only nine-tenths...

Author: /time Magazine | Title: Science: Elemental Debate | 9/23/1974 | See Source »

Shaky Ground. The Russians, led by Physicist Georgy N. Flerov, last June claimed a similar achievement using another technique: firing nuclei of chromium into lead. That produced a slightly different isotope of element 106 with an even shorter half-life of less than one-hundredth of a second. The Berkeley group was highly skeptical. Said Ghiorso: "The proof they presented is marginal. I think they are on shaky ground...

Author: /time Magazine | Title: Science: Elemental Debate | 9/23/1974 | See Source »

Previous | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next