Critical analysis of quark-meson coupling models for nuclear matter and finite nuclei |
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Institution: | 1. Department of Rural Technology, Guru Ghasidas Central University, Bilaspur 495009, India;2. Institute of Pharmacy, Guru Ghasidas Central University, Bilaspur 495009, India |
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Abstract: | Three versions of the quark-meson coupling (QMC) model are applied to describe properties of nuclear matter and finite nuclei. The models differ in the treatment of the bag constant and in terms of non-linear scalar self-interactions. In two versions of the model the bag constant is held fixed at its free-space value whereas in the third model it depends on the density of the nuclear environment. As a consequence opposite predictions for the medium modifications of the internal nucleon structure arise. After calibrating the model parameters at equilibrium nuclear matter density, binding energies, charge radii, single-particle spectra and density distributions of spherical nuclei are analyzed and compared with QHD calculations. For the models which predict a decreasing size of the nucleon in the nuclear environment, unrealistic features of the nuclear shapes arise. |
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