Word: meson
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Dates: during 1950-1959
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...lambda and one anti-lambda particle. Since both are neutral electrically, they leave no tracks in the liquid hydrogen, but after a short, invisible career, each decays into track-leaving particles by which it can be identified. The lambda ( 2) turns into a proton and a negative pi meson, both of which go off the picture leaving strong curved tracks. The anti-lambda (3) turns into an antiproton and a positive pi meson. The positive pi meson goes off the picture, but the antiproton hits a proton (4), creating two negative and two positive pi mesons, which shoot...
Last week, in trial runs with a pi meson beam, the whole weird contraption worked precisely. And over the glass cover, a stereoscopic camera takes pictures of meson tracks every twelve seconds, gathering 1,000 times more information for U.S. science than with the most sophisticated of earlier instruments...
...puzzle on the world's two most powerful atom-smashers, the Cosmotron at Brookhaven and the Bevatron at Berkeley, Calif. The atom-smashers have, in their few years of operation, raised more problems than they have solved. One of their most baffling stunts was to produce the K meson, a short-lived particle knocked out of atomic nuclei. In all significant ways K mesons are alike, but some of them, called "tau K mesons," decay into three pi mesons; others, called "theta K mesons," decay into only two pi mesons. For mathematical reasons which physicists can explain only...
Indirectly, Street played a part in the upheaval of the old theory, for the mu-meson, which he discovered several years ago, was instrumental in detecting the variation from the parity principle...
Methuselah of Space. Instead of sending a human subject into space at close to the speed of light and comparing him physically on his return with stay-at-home contemporaries, Dr. Crawford uses mu mesons. When these subatomic particles are at rest in relation to the earth, they disintegrate in an average earth time of less than two-millionths of a second. But when they are created by cosmic rays hitting atomic nuclei high in the atmosphere, they seem to have comparative immortality. Many of them reach the earth's surface more than ten miles below, although their short...