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Inelastic proton scattering at energies of a few hundred MeV and extremeforward angles selectively excites the isovector spin-flip M1 (IVSM1)resonance. A method based on isospin symmetry is presented to extract itselectromagnetic transition strength from the (p,p') cross sections. It isapplied to 48Ca, a key case for an interpretation of the quenching phenomenonof the spin-isospin response, and leads to a M1 strength consistent with anolder (e,e') experiment excluding the almost two times larger value from arecent (\gamma,n) experiment. Good agreement with electromagnetic probes isobserved in 208Pb suggesting the possibility to extract systematic informationon the IVSM1 resonance in heavy nuclei.

Electromagnetic M1 transition strengths from inelastic proton scattering: The cases of 48Ca and 208Pb