News Release | For Immediate Release | March 7, 2012
Three experiments, three groundbreaking scientific advances. In their latest paper published online today by the journalNature, the ALPHA Collaboration at CERN reported on a measurement, spearheaded by their Canadian collaborators, that measured for the first time an intrinsic property of antimatter atoms. In doing so, they’ve provided the world with its first glimpse of an “anti-atomic fingerprint.”
“For decades, scientists have wanted to study the intrinsic properties of antimatter atoms in the hope of finding clues that might help answer fundamental questions about our universe,” says lead author Mike Hayden, a physicist with Simon Fraser University. “In the middle of the last century, physicists were developing and using microwave techniques to study ordinary atoms like hydrogen. Now, 60 or 70 years down the road, we have just witnessed the first-ever microwave interactions with an anti-atom.”
After ALPHA’s previous two measurements demonstrated that antihydrogen (the antimatter partner to normal hydrogen) could be trapped and then held for long periods, the ALPHA team immediately exploited those breakthroughs with another, detecting for the first time the response of trapped antihydrogen to microwaves. So-called “microwave spectroscopy” is used to make ultra-precise measurements of atomic properties.
“This study demonstrates the feasibility of applying microwave spectroscopy to fiendishly difficult-to-handle anti-atoms,” says co-author Walter Hardy from the University of British Columbia. “ALPHA is about to enter an intensive upgrade phase that promises to create an ever-clearer picture of the inner structure of anti-matter atoms.” The ultimate goal is a precise measurement of antihydrogen’s atomic properties to compare them to the very well-known properties of normal hydrogen. Any discrepancy will yield invaluable information for why the universe is dominated by normal matter, while the anti-matter has all but disappeared.
This latest breakthrough was driven by the Canadian contributors to the ALPHA collaboration, led by Professors Hayden and Hardy. Hardy and Hayden designed the apparatus for this latest experiment, working closely with PhD candidates Mohammad Ashkezari of SFU and Tim Friesen from the University of Calgary (under the tutelage of Professor Robert Thompson). Meanwhile researchers from TRIUMF and York University, led by ALPHA-Canada spokesperson Makoto Fujiwara and Professor Scott Menary, respectively, teased faint signals from a sophisticated detector system, pinpointing matter-antimatter annihilation events.
ALPHA Collaboration spokesperson Jeffrey Hangst of Aarhus University pointed out, “Hydrogen is the most abundant element in the universe, and we understand its structure extremely well. Now we can finally begin to coax the truth out of antihydrogen. Are they different? Today we can confidently say “time will tell”.”
For More Information
ALPHA Canada Website: http://www.triumf.ca/alpha
ALPHA Collaboration website: http://alpha.web.cern.ch/alpha
TRIUMF is Canada’s national laboratory for particle and nuclear physics. Located on the south campus of the University of British Columbia, TRIUMF is owned and operated as a joint venture by a consortium of the following Canadian universities, via a contribution through the National Research Council Canada: University of Alberta, University of British Columbia, University of Calgary, Carleton University, University of Guelph, University of Manitoba, McMaster University, Université de Montréal, Queen’s University, University of Regina, Saint Mary’s University, Simon Fraser University, University of Toronto, University of Victoria, York University.
ALPHA is a collaboration of 42 physicists from 15 institutions from Canada, Brazil, Denmark, Israel, Japan, Sweden, UK, and the USA. ALPHA-Canada currently consists of 8 senior scientists, 5 graduate students, and several professional staff from 5 Canadian institutions. 15 out of 42 ALPHA co-authors in the reported work are with ALPHA-Canada: Andrea Gutierrez, Sarah Seif El Nasr, Walter Hardy (Univ. of British Columbia), Tim Friesen, Richard Hydomako, Robert Thompson (Univ. of Calgary), Mohammad Ashkezari, Michael Hayden (Simon Fraser Univ.), Scott Menary (York Univ.), Makoto Fujiwara, David Gill, Leonid Kurchaninov, Konstantin Olchanski, Art Olin, James Storey (TRIUMF). Spokesperson Makoto Fujiwara is also an adjunct professor in Calgary.
Dr. Marcello Pavan
Outreach & Communications
Tel: 604 222 7525
Cell: 604 868 7466
Prof. Mike Hayden
Simon Fraser University