CERN Traps Antimatter for 1000 seconds

[Todeswind]

Posted without comment

ScienceDaily (June 5, 2011) — In a paper published online by the journal Nature Physics today, the ALPHA experiment at CERN1 reports that it has succeeded in trapping antimatter atoms for over 16 minutes: long enough to begin to study their properties in detail. ALPHA is part of a broad programme at CERN's antiproton decelerator (AD)2 investigating the mysteries of one of nature's most elusive substances.
Today, we live in a universe apparently made entirely of matter, yet at the big bang matter and antimatter would have existed in equal quantities. Nature seems to have a slight preference for matter, which allows our universe and everything in it to exist. One way of investigating nature's preference for matter is to compare hydrogen atoms with their antimatter counterparts, and that's what makes today's result important.

"We can keep the antihydrogen atoms trapped for 1000 seconds," explained ALPHA spokesperson Jeffrey Hangst of Aarhus University. "This is long enough to begin to study them -- even with the small number that we can catch so far."

In the paper published today, some 300 trapped antiatoms are reported to have been studied. The trapping of antiatoms will allow antihydrogen to be mapped precisely using laser or microwave spectroscopy so that it can be compared to the hydrogen atom, which is among the best-known systems in physics. Any difference should become apparent under careful scrutiny. Trapping antiatoms could also provide a complementary approach to measuring the influence of gravity on antimatter, which will soon be investigated with antihydrogen by the AEgIS experiment.

Another important consequence of trapping antihydrogen for long periods is that the antiatoms have time to relax into their ground state, which will allow ALPHA to conduct the precision measurements necessary to investigate a symmetry known as CPT. Symmetries in physics describe how processes look under certain transformations. C, for example, involves swapping the electric charges of the particles involved in the process. P is like looking in the mirror, while T involves reversing the arrow of time.

Individually, each of these symmetries is broken -- processes do not always look the same. CPT, however, 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, and it is thought to be perfectly respected by nature. CPT symmetry requires that hydrogen and antihydrogen have identical spectra.
"Any hint of CPT symmetry breaking would require a serious rethink of our understanding of nature," said Hangst. "But half of the universe has gone missing, so some kind of rethink is apparently on the agenda. "

The next step for ALPHA is to start performing measurements on trapped antihydrogen, and this is due to get underway later this year. The first step is to illuminate the trapped anti-atoms with microwaves, to determine if they absorb exactly the same frequencies (or energies) as their matter cousins.

"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 -- even for just a single atom," explained Hangst. "This would provide the first ever look inside the structure of antihydrogen -- element number 1 on the anti-periodic table."

Notes:

1. CERN, the European Organization for Nuclear Research, is the world's leading laboratory for particle physics. It has its headquarters in Geneva. At present, its Member States are Austria, Belgium, Bulgaria, the Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Italy, the Netherlands, Norway, Poland, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom. One candidate for accession: Romania. India, Israel, Japan, the Russian Federation, the United States of America, Turkey, the European Commission and UNESCO have Observer status.

2. ALPHA is one of several AD experiments investigating antimatter at CERN. ATRAP has pioneered trapping techniques, and is also investigating antihydrogen. ASACUSA has made measurements of unprecedented precision of the antiproton's mass, so far not revealing any divergence from that of the proton. ASACUSA is also developing complementary techniques for studying antihydrogen. AEgIS studies how antiprotons fall under gravity, and ACE investigates the potential use of antiprotons for cancer therapy.

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[Norade]

That's some groundbreaking stuff they're doing. While I'm not anywhere near the level it would take to understand the full extent of what's being gained from all this, I'm glad that this project is detecting some of the stuff it was supposed to and showing such deep insights into how our universe works.

[GeneralERA]

That's rather surprising, I thought we hadn't been able to hold anti-hydrogen for anywhere near that long. I am somewhat interested as to whether that is the maximum time they can hold them; it seems here like they deliberately released the anti-hydrogen atoms so as to study them.

[Chirios]

I read somewhere else that two of their detectors had found evidence of the Higgs Boson as well, but that they needed to run a few months more tests to make sure that it wasn't just an anomalous result.

[Eternal_Freedom]

I read in the paper they had held it long enough to beign studying the antimatter, but I never realised it was anything like a thousand seconds. That's an astonishing increase over the millionths of a second previously managed.

Go CERN!

[General Trelane (Retired)]

That's rather surprising, I thought we hadn't been able to hold anti-hydrogen for anywhere near that long.

Developing the ability to do that was a priority of the ALPHA project; it's a necessary precursor to their ultimate goal, which is conducting experiments testing CPT symmetry between hyrdogen and anti-hydrogen.