Spin responses of unstable exotic nuclei studied by exothermic charge-exchange reactions in inverse-kinematics

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Using an unstable exotic beam of ^(12)Be, the exothermic charge-exchange (p,n) reaction which was not possible in the past was performed for the first time. The spin responses of very neutron rich nucleus (N-Z)/A=0.33 were studied. In particular, information on: (1) Gamow-Teller giant resonance and its strength, (2)Low lying spin dipole states as an indication of breakdown of neutron closed shell structure, were obtained. Furthermore the measurement was extended successfully to more neutron rich nucleus ^８He which has (N-Z)/A=0.5.