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RE: Live from CERN - Measuring antimatter properties with hybrid matter/antimatter atoms (without destroying the world)
Interesting that you are using helium to cool the antoprotonic helium. Stupid question, how do we further cool helium beyond the normal 4K of the liquid state?
Yes that's something that I had a lot of fun to read :)
Concerning the question, they actually use a very cold helium gas (and not liquid) as a buffer gas. The antiprotonic helium atoms are then cooled by elastic collisions with the buffer gas.