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coldatoms - Copy - Really Cold Atoms CAMBRIDGE MASS...

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Really Cold Atoms CAMBRIDGE, MASS. - Physicists in the U.S. say they have cooled sodium gas to the lowest temperature ever recorded – half-a-billionth of a degree above absolute zero. The researchers say the milestone beats the previous record by a factor of six, and marks the first time a gas was cooled below one nanokelvin, or a billionth of a degree. One of the researchers is a Nobel laureate At absolute zero, -273 degrees C, atomic motion stops as the cooling zaps all the energy from the particles. "To go below one nanokelvin is a little like running a mile under four minutes for the first time," said Nobel laureate Wolfgang Ketterle, co-leader of the physics team at the Massachusetts Institute of Technology. Ultra-low temperature gases could lead to more precise measurements by atomic clocks and sensors for gravity and rotation , according to David Pritchard, an atom optics expert at MIT and co-leader of the team.
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