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arXiv · 1503.01167

The isospin quartic term in the kinetic energy of neutron-rich nucleonic matter

Bao-Jun Cai·Bao-An Li
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Abstract

The energy of a free gas of neutrons and protons is well known to be approximately isospin parabolic with a negligibly small quartic term of only $0.45$ MeV at the saturation density of nuclear matter $ρ_0=0.16/\rm{fm}^3$. Using an isospin-dependent single-nucleon momentum distribution including a high (low) momentum tail (depletion) with its shape parameters constrained by recent high-energy electron scattering and medium-energy nuclear photodisintegration experiments as well as the state-of-the-art calculations of the deuteron wave function and the equation of state of pure neutron matter near the unitary limit within several modern microscopic many-body theories, we show for the first time that the kinetic energy of interacting nucleons in neutron-rich nucleonic matter has a significant quartic term of $7.18\pm2.52\,\rm{MeV}$. Such a large quartic term has significant ramifications in determining the equation of state of neutron-rich nucleonic matter using both terrestrial and astrophysical observables.

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Bao-Jun Cai, Bao-An Li. 2015-06-18. The isospin quartic term in the kinetic energy of neutron-rich nucleonic matter. https://doi.org/10.1103/physrevc.92.011601

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