In baryon- and neutron-rich matter the isospin symmetry energy drops substantially once a small fraction of antinucleons is included, with intrinsically larger isospin splitting for antinucleon potentials than for nucleon potentials.
A way forward in the study of the symmetry energy: experiment, theory, and observation
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abstract
The symmetry energy describes how the energy of nuclear matter rises as one goes away from equal numbers of neutrons and protons. This is very important to describe neutron rich matter in astrophysics. This article reviews our knowledge of the symmetry energy from theoretical calculations, nuclear structure measurements, heavy ion collisions, and astronomical observations. We then present a roadmap to make progress in areas of relevance to the symmetry energy that promotes collaboration between the astrophysics and the nuclear physics communities.
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Symmetry energy of baryon- and neutron-rich nuclear matter
In baryon- and neutron-rich matter the isospin symmetry energy drops substantially once a small fraction of antinucleons is included, with intrinsically larger isospin splitting for antinucleon potentials than for nucleon potentials.