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College of Arts and Sciences

Edward J. Stephenson

Edward J. Stephenson Senior Research Scientist

B.A., Rice University, 1969.
M.S.,University of Wisconsin, 1971.
Ph.D., University of Wisconsin, 1975.
Postdoctoral Positions: Lawrence Berkeley National Laboratory and Argonne National Laboratory.

Phone: IUCF 127 (812)855-5469
Email: stephene at

Symmetries and reactions involving polarized particles
My current research involves work at the COSY electron-cooled storage ring located at the Forschungszentrum-Juelich in Germany where we are demonstrating the technology needed to use the storage ring polarized beam to search for an electric dipole moment on the proton or deuteron. High efficiency beam polarimetry has been achieved including techniques for correcting systematic errors due to geometry or rate issues to the level of a part per million. The lifetime of beam polarization components that lie in the ring plane have been extended to 1000 seconds using electron cooling and sextupole correction fields. Control of the polarization phase is also possible. Other work includes the recent measurement of the electron-antineutrino correlation coefficient in neutron beta decay and measurement of the isospin and charge symmetry forbidden reaction converting two deuterons into a 4-He nucleus and an uncharged pion.

Selected Publications

  • Measurement of the Electron-Antineutrino Angular Correlation in Neutron beta Decay, G. Darius et al., Phys. Rev. Lett. 119, 042502 (2017).
  • Phase Locking the Spin Precession in a Storage Ring, H. Hempelmann et al., Phys. Rev. Lett. 119, 014801 (2017).
  • How to Reach a Thousand-Second in-Plane Polarization Lifetime with 0.97-GeV/c Deuterons in a Storage Ring, G. Guidoboni, E. Stephenson et al., Phys. Rev. Lett. 117, 054801 (2016).
  • Measuring the polarization of a rapidly precessing deuteron beam, Z. Bagdasarian et al., Phys. Rev. ST - Accel. Beams 17, 052803 (2014).
  • Correcting systematic errors in high-sensitivity deuteron polarization measurements, N.P.M. Brantjes et al., Nucl. Instrum. Methods Phys. Res. A 664, 49 (2012).
  • Charge Symmetry Breaking and QCD, Gerald A. Miller, Allena K. Opper, and Edward J. Stephenson, Ann. Rev. Nucl. Part. Sci. 56, 253 (2006).
  • New Method of Measuring Electric Dipole Moments in Storage Rings, F.J.M. Farley, K. Jungmann, J.P. Miller, W.M. Morse, Y.F. Orlov, B.L. Roberts, Y.K. Semertzidis, A. Silenko, and E.J. Stephenson, Phys. Rev. Lett. 93, 052001 (2004).
  • Observation of the Charge Symmetry Breaking d+d->4He+pi0 Reaction near Threshold, E.J. Stephenson, A.D. Bacher, C.E. Allgower, A. GĂ„rdestig, C.M. Lavelle, G.A. Miller, H. Nann, J. Olmsted, P.V. Pancella, M.A. Pickar, J. Rapaport, T. Rinckel, A. Smith, H.M. Spinka, and U. van Kolck, Phys. Rev. Lett. 91, 142302 (2003).