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Scientists used CERN's high-energy accelerator to create the antihydrogen atoms, and then chilled them to near-zero temperatures. (www.lhc.ac.uk: file photo)
Scientists say they have trapped and stored atoms of antihydrogen for a record 16 minutes, a feat that promises deeper insights into the mysteries of antimatter.
At the moment of the big bang, nearly 14 billion years ago, matter and antimatter are thought to have existed in equal quantities. But matter and anti-matter annihilate each other in a small flash of energy when they collide.
If that balance had persisted, the observable universe we inhabit would never have come into being. For unknown reasons nature seemed to have a slight preference for matter.
This asymmetry remains one of the greatest riddles in particle physics. Low-energy experiments with hydrogen atoms could be a key step toward solving this riddle.
Late last year, scientists announced they had trapped dozens of antimatter atoms and held 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.
"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, spokesman 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 antiatoms.
Scientists used CERN's high-energy accelerator to create the antihydrogen atoms, and then chilled them to near-zero temperatures.
The aim is to use laser and microwave spectroscopy to compare the immobilised particles to their hydrogen counterparts.
Scientists will now look for "violations" or discrepancies in something called the charge-parity-time reversal (CPT) symmetry.
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.
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.
According to this rule, hydrogen and antihydrogen, should have exactly the same spectral profile.
"Any hint of CPT symmetry breaking would require a serious rethink of our understanding of nature," Dr 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.
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," Dr Hangst said.
"It will be the first time anybody has interacted with antiatoms 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, Dr Hangst added.
- AFP
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