[1] Queen Mary Univ London, Sch Phys & Astron, London, England
[2] Sichuan Univ, Coll Phys Sci & Technol, Chengdu, Sichuan, Peoples R China
[3] Rutherford Appleton Lab, ISIS Muon Facil, Didcot, Oxon, England
[4] Univ Kentucky, Dept Chem, Lexington, KY USA
[5] Univ Sheffield, Dept Mat Sci & Engn, Sheffield, S Yorkshire, England
[6] Univ Fribourg, Dept Phys, Fribourg, Switzerland
[7] J PARC Ctr, Mat & Life Sci Div, Tokai, Ibaraki, Japan
[8] RIKEN, RAL, Nishina Ctr, Wako, Saitama, Japan
[9] Queen Mary Univ London, Sch Biol & Chem Sci, London, England