NEW RESULTS ON MULTIPLE EXCITATIONS OF GIANT-RESONANCES

Exotic excitations like the double giant dipole were predicted for man y years but not observed experimentally until recently. Several experi ments have been carried out at Los Alamos National Laboratory to searc h for these new collective modes of the nucleus. The results discover two previously unobserved types of double giant resonances. This work presents the recent pion double charge exchange data and the analysis that support the existence of two such exotic vibrational nuclear mode s.