T.Hasegawa1,N.Ueda1,T.Fujisawa2,T.Wada2,N.Kishida3, H.Ohnuma3,K.Iwatani4,T.Tanaka5,Y.Wakuta5 Institute for Nuclear Study, Univ. of Tokyo, Tanashi1 Inst.of Physical and Chemical Res. (RIKEN2 Tokyo Inst.of Technology, Tokyo3 Hiroshima Univ., Hiroshima and Higashi-Hiroshima4 Kyushu Univ., Fukuoka5
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