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. Department of Polymer
Science and Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
4. Institute for Advanced Study, Shenzhen University, Shenzhen, 518060, China
5. Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States