CERN experiment makes progress towards antihydrogen beams

CERN
December 6, 2010

 
• A d v e r t i s e m e n t

 

Geneva – The ASACUSA experiment at CERN has taken an important step forward in developing an innovative technique for studying antimatter. Using a novel particle trap, called a CUSP trap, the experiment has succeeded in producing significant numbers of antihydrogen atoms in flight. This result is published today in the journal Physical Review Letters.

Antimatter – or the lack of it – remains one of the biggest mysteries of science. Matter and its counterpart are identical except for opposite charge, and they annihilate when they meet. At the Big Bang, matter and antimatter should have been produced in equal amounts. However, we know that our world is made up of matter: antimatter seems to have disappeared. To find out what has happened to it, scientists employ a range of methods to investigate whether a tiny difference in the properties of matter and antimatter could point towards an explanation.

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One of these methods is to take one of the best-known systems in physics, the hydrogen atom, which is made of one proton and one electron, and check whether its antimatter counterpart, antihydrogen, consisting of an antiproton and a positron, behaves in the same way. The challenge is to create antihydrogen atoms, and keep them away from ordinary matter for long enough to study them. ASACUSA’s CUSP trap uses a combination of magnetic fields to bring antiprotons and positrons together to form antihydrogen atoms, and then channel them along a vacuum pipe where they can be studied in flight. So far, only a few antihydrogen atoms have been produced in this way, but the experiment’s ultimate goal is to produce enough to investigate their behaviour in detail with the help of microwaves.

This article was posted: Tuesday, December 7, 2010 at 1:17 pm

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