Testing QCD at Low Energies
Professor Kara J. Keeter
Department of Physics, Idaho State University, Pocatello
Idaho State University has recently started a collaboration with Duke University to measure Compton scattering off the proton and the neutron using the new Duke Free-Electron Laser Laboratory (DFELL). The goal of these experiments is to determine the electric and magnetic polarizabilities of the nucleon. These polarizabilities are fundamental quantities which provide information on the internal structure of the nucleon. Recently, an effective field theory based on Quantum Chromodynamics (QCD) has been used to calculate these polarizabilities as well as the analyzing powers which will be measured in these experiments. The experimental results will be compared to the theoretical predictions and will provide a valuable test of Chiral Perturbation Theory (CPT). CPT is essentially the application of QCD at low energies (< 500 MeV), and allows us to test our understanding of the spontaneous and explicit chiral symmetry breaking in QCD.
ISU also has new and exciting research opportunities at the Idaho Accelerator Center (IAC), with the recently-completed Accelerator Center Building, which houses a variable energy (4-30 MeV), high current, short pulse (10 ps) linac. The IAC offers outstanding facilities for the study of the atomic nucleus in an energy range where a vast majority of
technological applications are to be found, such as fission and fusion energy, medical applications, and non-destructive evaluation technology. The IAC is currently involved in research in various areas including: materials detection, verification, and characterization; BNCT and other radiation therapies; and basic photonuclear and astrophysical research. A description of the facilities will be provided.