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Nucleon Effective Mass in Asymmetric Nuclear Matter within Extended Brueckner Approach |
| GAN Sheng-Xin1,2,ZUO Wei1**,U. Lombardo3 |
1Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000
2Graduate School of Chinese Academy of Sciences, Beijing 100049
3Department of Physics and Astrophysics, Catania University, Via Santa Sofia 64, I-95123, Italy |
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| Cite this article: |
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GAN Sheng-Xin, ZUO Wei, U. Lombardo 2012 Chin. Phys. Lett. 29 042102 |
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Abstract The on-shell properties of the nucleon effective mass in asymmetric nuclear matter are investigated in the framework of an extended Brueckner–Hartree–Fock (BHF) approach. The proton and neutron effective masses in neutron-rich nuclear matter are predicted by including both the effect of ground state correlations and the three-body force (TBF) rearrangement contribution. Within this framework, the neutron effective mass is predicted to be larger than the proton one in neutron-rich nuclear matter, i.e., mn* ≥mp*. The effect of ground state correlations turns out to be dominated at low densities and it leads to a strong enhancement of the effective mass. The TBF rearrangement contribution becomes predominant over the effect of ground state correlations at high densities and it reduces remarkably the absolute magnitude of the isospin splitting of the neutron and proton effective masses in neutron-rich matter at high densities.
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Received: 05 October 2011
Published: 04 April 2012
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| PACS: |
21.65.Cd
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(Asymmetric matter, neutron matter)
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24.10.Cn
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(Many-body theory)
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21.30.Fe
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(Forces in hadronic systems and effective interactions)
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21.60.De
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(Ab initio methods)
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