Physics Division, Building 203
Argonne National Laboratory
Argonne, IL 60439 USA
RESEARCH AREA: Experimental medium energy nuclear physics; quark flavor and spin structure of the nucleon; few-body systems on the sub-femtometer scale; three-body force; polarized gas targets and polarimetry.
Description of Current Research: My current research focuses on the study of the nucleon and light nuclei using medium energy probes. In particular, I have used high energy photons at Jefferson Laboratory as a means to establish a signature for quark effects in nuclei. In the HERMES experiment at DESY, I am involved in studies of the parton and spin structure of the nucleon. I focused effort on measurements of polarization effects in polarized fragmentation functions for the ep ->e' lambda X. I have led developments of polarized gas targets for storage rings. The first use of a laser-driven polarized deuterium target in the Cooler ring at IUCF indicated dynamical evidence for the three-body force in nuclei. Presently, I am investigating the feasibility of performing measuring atomic parity violation in hydrogenic atoms.
HERMES Collaboration, " Beam-induced nuclear depolarization in a gaseous polarized-hydrogen target," Phys. Rev. Lett. 82, 1164-1168 (1999).
HERMES Collaboration, "Flavor asymmetry of the light quark sea from semi-inclusive deep-inelastic scattering," Phys. Rev. Lett. 81, 5519-5523 (1998).
C. Bochna et al., "Measurements of Deuteron Photodisintegration up to 4.0 GeV," Phys. Rev. Lett. 81, 4576 (1998).
K. Ackerstaff et al., "Measurement of the Neutron Spin Structure Function g1n with a Polarized 3He Internal Target," Phys. Lett. B 404, 383 (1997).
K. P. Coulter et al., "Spin-Exchange Optical Pumping as a Source of Spin Polarized Atomic Deuterium," Phys. Rev. Lett. 68, 174 (1992).
R. Gilman, et al., "Measurement of the Tensor Analyzing Power in Electron-Deuteron Elastic Scattering," Phys. Rev. Lett. 65, 1733 (1990).
R. J. Holt et al., "Measurement of the Angular Distribution of Tensor Polarization in Pion-Deuteron Elastic Scattering," Phys. Rev. Lett. 47, 472 (1981).
Honors and Awards
Fellow of the American Physical Society, 1994
Arnold O. Beckman Research Award, 1994
Fellow of the Institute of Physics (London), 1999