GBAR est une collaboration internationale dont les membres sont:
- CEA/IRFU
- CSNSM/IN2P3 Orsay (FR)
- ETH Zurich (CH)
- ILL Grenoble (FR)
- IPCMS Strasbourg (FR)
- LKB Paris, (FR)
- Lebedev Institute Moscow (RU)
- JGU Mainz (GE),
- NCBJ Otwock-Swierk (PL)
- Swansea University (UK)
- RIKEN (JP)
- University of Tokyo, Komaba, (JP)
- Kyoto University (JP)
- Uppsala University (SE)
- Stockholm University (SE)
- Seoul National University (KR)
- Institute for Basic Science Daejon (KR)
- Korea University (KR)
- Ulsan National Institute (KR)