  Nuclear matrix elements (NMEs) for neutrinoless double beta decays (DBDs) are
required for studying neutrino physics beyond the standard model by DBD. The
experimental spin-dipole (SD) giant resonance energy and the SD strength are
shown for the first time to be closely related to the DBD-NME, and are used for
studying the spin-isospin correlation and the quenching of the axial-vector
coupling. So they are used to help the theoretical model calculation of the
DBD-NME.
