Microscopic Study of Nuclear ``Pasta'' by Quantum Molecular Dynamics

Details Microscopic Study of Nuclear ``Pasta'' by Quantum Molecular Dynamics Microscopic Study of Nuclear ``Pasta'' by Quantum Molecular Dynamics

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..haw.df012w&link_type=abstract

American Physical Society, First Joint Meeting of the Nuclear Physicists of the American and Japanese Physical Societies October

Physics

Scientific paper

Dense stellar matter at subnuclear densities is investigated with quantum molecular dynamics (QMD) approach. In the corresponding density region of the neutron star (NS) and supernova (SN) core, nuclei are expected to have exotic structures such as rod-like or slab-like shape etc., which are called nuclear ``pasta''. Macroscopically, the favorable nuclear shape is determined by a balance between the surface and Coulomb energies. Though most of the previous calculations assume specific nuclear shapes, it is important to adopt microscopic approach which allows arbitrary nuclear structures to obtain a realistic picture about NS crusts and SN cores. We have started studying dense matter with microscopic and dynamical simulation in the framework of QMD in order to understand the melting process of nuclei into uniform nuclear matter and the formation process of nuclear ``pasta'' as our final purpose. As the first step of this study, we tried to reproduce the exact ground state, which had not been achieved in previous studies about dense stellar matter with QMD approach. We then succeeded in showing that the phases with slab-like and rod-like nuclei etc. appear at subnuclear densities without any assumptions on nuclear shape. In this presentation, we will report the above results and show phase diagrams for dense nuclear matter at subnuclear densities. We are also planning to give our insights into the microscopic factor which decides the nuclear structure.

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