Gai, Wei [P:(DE-HGF)0] ; Kuriki, Masao [P:(DE-HGF)0] ; List, Benno [P:(DE-H253)PIP1002008] ; Moortgat-Pick, Gudrid [P:(DE-H253)PIP1011115] ; Okugi, Toshiyuki [P:(DE-HGF)0] ; Omori, Tsunehiko [P:(DE-HGF)0] ; Riemann, Sabine [P:(DE-H253)PIP1003733] ; Sievers, Peter [P:(DE-HGF)0] ; Takahashi, Tohru [P:(DE-HGF)0] ; Terunuma, Nobuhiro [P:(DE-HGF)0] ; Ushakov, Andriy [P:(DE-H253)PIP1005186] ; Yamamoto, Akira [P:(DE-HGF)0] ; Yokoya, Kaoru [P:(DE-HGF)0] ; Positron Working Group Collaboration [P:(DE-HGF)0]