ISOTENSOR DOUBLE GIANT-RESONANCE FROM CHARGE-EXCHANGE REACTIONS

Giant resonances are collective excitations of the nucleus in which a large fraction of the component nucleons are set into coherent modes o f vibrations. Exotic excitations like the double giant dipole were pre dicted for many years but not observed experimentally until recently. Several experiments have been carried out at Los Alamos National Labor atory to search for these new collective modes of the nucleus. The res ults discover two previously unobserved types of double giant resonanc es. This work presents the recent pion double charge exchange data and the analysis that support the existence of two such exotic vibrationa l nuclear modes. Multiple excitations of the giant dipole resonance us ing relativistic heavy ion excitation is under investigation. The resu lts from pion double charge exchange excitation will be compared with the relativistic heavy ion scattering.