|Pritzker Science Center, room 146D _or_ Tech South, room 1A8-1|
|3101 South Dearborn, St. _or_ 3424 S. State St.|
|Chicago, IL 60616|
|Other URL:||My "official" web page|
In 1998 I assembled a manual on Physics Demonstrations in Mechanics available in the IIT Physics Dept.
Selected research from my group at IIT, the Muon Ionization Cooling Experiment, the national Muon Accelerator Program, and the Fermilab NOvA neutrino experiment:
Nature paper: First demonstration of muon ionization cooling!
Paper in Physical Review Letters: First Measurement of Neutrino Oscillation Parameters using Neutrinos and Antineutrinos, M.A. Acero et al. [NOvA Collaboration], Phys. Rev. Lett. 123, 151803 (2019).
At CAARI 2018 in Grapevine, TX, I presented an invited talk on
At CIPANP 2018 in Indian Wells, CA, I presented a poster on
At COOL'15 at Jefferson Laboratory I presented the invited talk
At ICNFP2014 in Crete, Greece, I presented the invited talk
as well as a poster on Measuring Antimatter Gravity with Muonium (see below).
With a small group, I'm now investigating the feasibility of a novel measurement of antimatter gravity!
Does antimatter fall up??? This "science fiction" idea is being taken seriously by a number of researchers.
You may have heard about antimatter as the fuel for the Starship Enterprise, or as the weapon of mass destruction in Angels and Demons. Although rare in nature, antimatter is real, and is studied at particle accelerator laboratories around the world and used everyday in positron-emission tomography (PET) scans at hospitals.
Einstein's General Theory of Relativity, the accepted theory of gravity, predicts no difference between the gravitational behavior of antimatter and that of matter. While well established experimentally, General Relativity is fundamentally incompatible with quantum mechanics, and finding a quantum alternative has been a longstanding quest of physics.
Since all available experimental evidence on which to base a quantum theory of gravity concerns matter-matter interactions, matter-antimatter measurements could play a key role in this quest. Indeed, the most general candidate theories include the possibility that the force between matter and antimatter will be different — perhaps even of opposite sign! — from that of matter on matter.
So if antimatter falls up in the gravitational field of the Earth — or even if it falls down, but at a different rate from matter — it will be a really big deal!
But so far no experiment has been sensitive enough to make this very difficult measurement. The first problem is to _make_ some neutral antimatter. This can only be done in tiny quantities. The second is to build a sensitive enough device to detect the tiny effect of gravity on a single atom. Four teams of physicists at the CERN laboratory, in Geneva, Switzerland (where the Higgs boson was discovered) are all competing to make the first measurement using antihydrogen.
I'm leading a group of IIT physicists looking into a new and different approach: make a beam of unstable "muonium" atoms (perhaps at Fermilab, in Batavia, 40 miles west of IIT, or at the Paul Scherrer Institute in Switzerland), and put it through a precision interferometer to measure its trajectory with picometer precision. We don't know yet whether this is just hard, or impossible, but we're keen to work through the details and find out.
For more, see our recent papers, my physics colloquium, and poster presented at CPT'16.