Abstract
We study the consequence of having different values for the delta isobar Landau-Migdal parameters, ${g}_{\mathrm{N}{\mathit{\ensuremath{\Delta}}}^{\mathcal{'}}}$ and ${g}_{\ensuremath{\Delta}\ensuremath{\Delta}}^{\mathcal{'}}$, from that of the nucleon parameter ${g}_{\mathrm{NN}{}^{\mathcal{'}}}$ on the high momentum properties of the spin-isospin responses and the pion condensation threshold of nuclei. Recent data on the spin responses prefer larger values for g's. The facts that the pion condensate is not realized in nuclei and that the precritical phenomena are not observed by a significant amount provide the lower bound for ${g}_{\mathrm{N}{\mathit{\ensuremath{\Delta}}}^{\mathcal{'}}}$. We discuss also the sensitivities of the response functions on the choice of various quantities such as the effective mass and the coupling form factors.
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