Experiments with Antimatter: the Physics of Positrons and Antiprotons
Dr. Giulio Stancari
Idaho State University and Jefferson National Lab
The existence of antimatter was postulated theoretically by Dirac in
1931 after developing a relativistic quantum equation for the electron.
The first positrons were observed by Anderson in cosmic rays in 1932,
and the first observed antiprotons were produced artificially by
Segr´e and collaborators at the Bevatron in 1955. Fast
antihydrogen atoms were produced at CERN and at Fermilab in the
1990’s, and cold antihydrogen has been studied at CERN since
2002. In this seminar, I will describe how positrons and antiprotons
are produced and used. Current research topics will also be discussed,
such as the design of a positron source for the CEBAF accelerator at
Jefferson Lab; attempts to produce polarized beams of antiprotons; and
the physics of proton-antiproton annihilations at relativistic energies.