GiantM1 resonance inZr90

The distribution of magnetic dipole transition strength in ${}_{}{}^{90}{}_{}{}^{}\mathrm{Zr}$ has been measured at excitations between 8.1 and 10.5 MeV with highly polarized tagged photons. A total M1 strength of Jg${\mathrm{\Gamma }}_0^2$(M1)/ Γ${=37.7\mathrm{}}_{\mathrm{-}4.0}^{+5.1\mathrm{}}$ eV was found to be broadly distributed throughout the region. This strength can account for the giant M1 resonance predicted in ${}_{}{}^{90}{}_{}{}^{}\mathrm{Zr}$. A substantial amount of E1 transition strength was also identified. This E1 strength has important implications for the interpretation of forward-angle (p,p’) scattering and its use in identifying M1 transitions in heavier nuclei.