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helium-4

   Also found in: Wikipedia 0.02 sec.
helium-4 [′hē·lē·əm ′fȯr]
(nuclear physics)
The isotope of helium with mass number 4, constituting nearly all naturally occurring helium.
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Physicists have now heard a quantum-mechanical whistle emanating from two reservoirs of liquid helium-4 that were separated by a perforated membrane.
A quantum fluid pipes up by Science News
Superfluid helium-4 has become a common tool of science and will be used as the coolant fluid in the Large Hadron Collider, a huge particle accelerator being built under the border between France and Switzerland.
2 NOBEL PRIZES SHARED BY 6 SCIENTISTS : 5 AMERICANS, ONE BRITON ... by Daily News (Los Angeles, CA)
As the scientists continued to lower the temperature, they detected signs that at about 175 millikelvins the solid version of the isotope helium-4 stopped being dragged around because of friction with the disk.
A solid like no other: frigid, solid helium streams like a liquid by Weiss, P. / Science News
 
 
 
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