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

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

1993-08-20

arxiv.org/abs/nucl-th/9308017v1

Physics

Nuclear Physics

Nuclear Theory

9 pages (2 figures not included, hard copy available upon request), SUT-AS-930801

Scientific paper

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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