Effective Masses and Sizes of N(939), $\Delta\!\!\mbox{\boldmath(1232)}$ and N(1440) in Nuclear Medium

The effective masses and sizes of N(939), $\\Delta(1232)$ and N(1440) in nuclear medium are calculated for a model in which quarks are subjected to a confinement force quenched by the scalar part of nuclear interactions. At the nuclear matter density, the nucleon swells by 50\\% relative to the free nucleon. The masses of $\\Delta(1232)$ and N(1440) decrease in nuclear medium more than the nucleon, so that the pion requires less energy to excite them in nuclear medium than it does for a free nucleon.

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