Scientists close in on antimatter

2011-06-06 09:30
Paris - Scientists said on Sunday they had trapped and stored antihydrogen atoms for a record 16 minutes, a stunning technical feat that promises deeper insights into the mysteries of antimatter.

Particles and anti-particles annihilate each other in a small flash of energy when they collide.

At the moment of the big bang, nearly 14 billion years ago, matter and antimatter are thought to have existed in equal quantities. If that balance had persisted, the observable Universe we inhabit would never have come into being.

For unknown reasons - and fortunately for us - Nature seemed to have a slight preference for matter, and today antimatter is rare. This asymmetry remains one of the greatest riddles in particle physics.

Ongoing low-energy experiments with hydrogen atoms could be a key step toward solving it.

High-energy accelerator

"We can keep the antihydrogen atoms trapped for 1 000 seconds. This is long enough to begin to study them - even with the small number that we can catch so far," said Jeffrey Hangst, spokesperson for the Alpha team conducting the tests at the European Organisation for Nuclear Research (Cern) in Geneva.

In the study, published in the journal Nature Physics, researchers report trapping some 300 anti-atoms.

Scientists used Cern's high-energy accelerator to create the antihydrogen atoms, and then cooled them to near absolute zero temperatures (-273°C).

The aim is to use laser and microwave spectroscopy to compare the immobilised particles to their hydrogen counterparts.

The same team succeeded in 2010 in trapping dozens of antimatter atoms and holding them in place for a fraction of a second, a world first at the time.

But that was not long enough for the excitable particles to settle into the stable "ground" state needed for precise measurements.

The new benchmark extended this storage time 5 000 fold, making it possible to carry out crucial experiments.

Scientists will now look for "violations" or discrepancies in something called the charge-parity-time reversal (CPT) symmetry.

Spectral profile

CPT says that a particle moving forward through time in our universe should be indistinguishable from an antiparticle moving backwards through time in a mirror universe.

According to this rule, hydrogen and antihydrogen, in other words, should have exactly the same spectral profile.

"Any hint of CPT symmetry breaking would require a serious rethink of our understanding of nature," Hangst in a statement.

"But half the universe has gone missing, so some kind of rethink is apparently on the agenda."

The absence of any solid theoretical prediction of how CPT-violation will occur - or, indeed, if it will happen at all - suggests to what extent the experiments will be breaking new ground.

The "C" of CPT involves swapping the electric charges of the particles. "P" for parity "is like looking in the mirror", Cern explained in a press release. And "T" means reversing the trajectory of time.

Measurements of trapped antihydrogen are due to get underway shortly, and could yield results before the end of the year.

"If you hit the trapped antihydrogen atoms with just the right microwave frequency, they will escape from the trap and we can detect the annihilation," Hangst said.

"It will be the first time anybody has interacted with anti-atoms to probe their structure."

The ability to store bits of antimatter for a quarter of an hour - far longer that researchers expected - could also provide a new way to measure how they are influenced by gravity, Hangst added.
Read more on:    cern  |  science
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