Gold plated ultra-pure copper is used to provide thermal contact from the dilution refrigerator to the grooved acrylic cell. Pyrex injection cell is one important part of the nEDM experiment.


MEPG group members (from left to right): Georgios Laskaris, Pinghan Chu, Yang Zhang, Xiaqing Li, Qiujian Ye, Haiyan Gao, Chao Peng, Min Huang, Mehdi Meziane, Xuefei Yan, Sucheta Jawalkar

Gerasimov-Drell-Hearn (GDH) sum rule

The GDH sum rule provides an elegant connection between the nucleon excitation spectrum and its static properties.


Neutron TRANSVERSITY experiment will study nucleon transverse spin structure together with other transverse momentum dependent structure functions (TMDs).

Hall-B at JLab

The CEBAF large acceptance spectrometer (CLAS) is a nearly 4π detector used to study photo- and electro-induced nuclear and hadronic reactions.


JLab's CEBAF accelerator provides continuous electron beam upto 6 GeV and currently there is an upgrade project to double the beam energy to 12 GeV.

Hall-A at JLab

The two High Resolution Spectrometers (HRS) in Hall-A are designed for detailed investigation of nuclear structure.

Injection Test

Test the polarization loss of 3He injected from the ABS and collected within superfluid 4He at 0.3 - 0.5K. Very important part of the new nEDM experiment.

Relaxation time

3He relaxation time measurement from dTPB coated acrylic cell at 1.9K and 0.3 - 0.5K.

Duke FEL Lab

The storage ring based FEL provides precisely tunable coherent radiation and a novel light source (Hiγs) with unprecedented photon flux by internal backscattering.

Areas of Interest

    QCD Physics: nucleon structure, exotic particle/state search; Fundamental symmetry study and search for new physics beyond the Standard Model; Development of polarized gas targets

Research Overview

Our research focuses on understanding the structure of the nucleon in terms of quark and gluon degrees of freedom of Quantum Chromodynamics (QCD), search for QCD exotics, and fundamental symmetry studies at low energy to search for new physics beyond the Standard Model of electroweak interactions. Most recently, our studies on the structure of the nucleon have been focusing on imaging the three-dimensional structure of the nucleon in momentum space. Our group is leading the Solenoidal Large Intensity Device (SoLID) project at Jefferson Lab . Most of our work utilizes the novel experimental technique of scattering polarized electrons or photons from polarized gas targets. Our group has built a number of state-of-the-art polarized gas targets including H/D internal gas target and a high-pressure polarized 3He target for photon experiments using the High Intensity Gamma Source (HIGS) facility at the Duke Free Electron Laser Laboratory (DFELL). More recently, we are also carrying out tabletop measurements in searching for time-reversal and parity symmetry violating new type of forces using such high pressure polarized 3He target cells. Our group is also embarking on a challenging experiment aiming at a major improvement over the current limit on the neutron electric dipole moment. Such an experiment will make important contributions to the understanding of CP violation and to the search of New Physics beyond the Standard Model. Our research is being carried out mostly at the Thomas Jefferson National Accelerator Facility (JLab) in Newport News, Virginia, the HIGS facility at DFELL, and the Fundamental Neutron Beam Line at the Spallation Neutron Source at the Oak Ridge National Laboratory .