1. China Spallation Neutron Source (CSNS), Institute of
High Energy Physics (IHEP), Chinese Academy of Sciences (CAS), Dongguan 523803, China
2. Dongguan Institute
of Neutron Science (DINS), Dongguan 523808, China
3. ISIS-STFC, Rutherford Appleton Laboratory, Chilton, Oxon OX11 0QX, U.K.
4. Center for Neutron
Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States
5. Institute for Advanced Study, Shenzhen University, Shenzhen 518060, China