# Effect of nucleon structure variation on the longitudinal response function

Source: [Effect of nucleon structure variation on the longitudinal response function](<https://www.sota2.com/research/paper/68fa29121e209131ce830b10>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T12:39:55.625Z

Authors: K. Saito, K. Tsushima, A.W. Thomas

Published: 1999-04-21T02:00:40.000Z

## Abstract

Using the quark-meson coupling (QMC) model, we study the longitudinal response function for quasielastic electron scattering from nuclear matter. In QMC the coupling constant between the scalar ($\\sigma$) meson and the nucleon is expected to decrease with increasing nuclear density, because of the self-consistent modification of the structure of the nucleon. The reduction of the coupling constant then leads to a smaller contribution from relativistic RPA than in the Walecka model. However, since the electromagnetic form factors of the in-medium nucleon are modified at the same time, the longitudinal response function and the Coulomb sum are reduced by a total of about 20% in comparison with the Hartree contribution. We find that the relativistic RPA and the nucleon structure variation both contribute about fifty-fifty to the reduction of the longitudinal response.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/nucl-th/9904055>)

[PDF](<https://arxiv.org/pdf/nucl-th/9904055.pdf>)