Abstract
Herein, we present a theoretical study of how Fermi-surface distortion affects symmetric nuclear matter, pure neutron matter, and neutron-star matter. The results indicate that, for the binding energy of symmetric nuclear matter, the generally accepted value extracted from the Bethe-Weizäcker mass formula for nuclei can constrain the degree of anisotropy because of Fermi-surface deformation . The value of starts to affect the stiffness of the equation of state for symmetric nuclear matter and pure neutron matter when . Moreover, if the Fermi surface is distorted, the results indicate that neutron stars can be deformed into an oblate shape. This deformation depends on two factors: the stiffness of the corresponding equation of state and value of . The corresponding deformation near the maximum neutron-star mass comes from the anisotropic pressure within these stars, which is caused by the distortion of Fermi surface predicted by the equation of state of the models.
8 More- Received 25 December 2018
- Revised 12 June 2019
DOI:https://doi.org/10.1103/PhysRevC.100.055804
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