Both the Gamow-Teller (GT) and the pionic response functions are investigated in the same framework of the continuum random phase approximation with the π ρ + g′ model interaction. The Landau-Migdal (LM) parameters, g′NN and g′NΔ, are estimated by comparing these calculations with recent experimental data. The peak of the GT resonance and the pionic response functions below the quasielastic scattering (QES) peak constrain g′NN, whereas the quenching of the GT total strength and the enhanced pionic strength around the QES peak provide information about g′NΔ. We obtain a common set of the LM parameters, g′NN = 0.6-0.7 and g′NΔ = 0.2-0.4, which reproduce the peak and quenching of the GT strengths as well as the enhancement of the pionic modes. The g′NΔ value is significantly smaller than g′NN, which means that the universality ansatz, g′NN = g′NΔ, should not be valid.
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