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About: Buffer-gas trap     Goto   Sponge   NotDistinct   Permalink

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The buffer-gas trap (BGT) is a device used to accumulate positrons (the antiparticles of electrons) efficiently while minimizing positron loss due to annihilation, which occurs when an electron and positron collide and the energy is converted to gamma rays. The BGT is used for a variety of research applications, particularly those that benefit from specially tailored positron gases, plasmas and/or pulsed beams. Examples include use of the BGT to create antihydrogen and the positronium molecule.