Abstract
Quadrupole giant resonances (GQR) play a major role in characterizing dynamical properties of both stable and unstable nuclei. In this paper two topics related with GQR are discussed based on recent experimental findings at RIKEN; 1) clear observation of isovector GQR in a heavy ion charge-exchange reaction, ( 13C, 13N) on 60Ni at 100 MeV/nucleon, and 2) E2 effective charges varying with isospin asymmetry as evidenced by the electric quadrupole moments of neutron rich B isotopes.
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