Momentum, density, and isospin dependence of symmetric and asymmetric nuclear matter properties
Momentum, density, and isospin dependence of symmetric and asymmetric nuclear matter properties
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DOI：
10.1103/physrevc.72.065803
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发表时间：
2005-11
影响因子：
3.1
通讯作者：
E. V. Dalen;C. Fuchs;A. Faessler
中科院分区：
文献类型：
--
作者：
E. V. Dalen;C. Fuchs;A. Faessler
Properties of symmetric and asymmetric nuclear matter have been investigated in the relativistic Dirac-Brueckner-Hartree-Fock approach based on projection techniques using the Bonn A potential. The momentum, density, and isospin dependence of the optical potentials and nucleon effective masses are studied. It turns out that the isovector optical potential depends sensitively on density and momentum, but is almost insensitive to the isospin asymmetry. Furthermore, the Dirac mass ${m}_{D}^{*}$ and the nonrelativistic mass ${m}_{\mathit{NR}}^{*}$ which parametrizes the energy dependence of the single particle spectrum, are both determined from relativistic Dirac-Brueckner-Hartree-Fock calculations. The nonrelativistic mass shows a characteristic peak structure at momenta slightly above the Fermi momentum ${k}_{F}$. The relativistic Dirac mass shows a proton-neutron mass splitting of ${m}_{D,n}^{*}l{m}_{D,p}^{*}$ in isospin asymmetric nuclear matter. However, the nonrelativistic mass has a reversed mass splitting ${m}_{\mathit{NR},n}^{*}g{m}_{\mathit{NR},p}^{*}$ which is in agreement with the results from nonrelativistic calculations.
Properties of symmetric and asymmetric nuclear matter have been investigated in the relativistic Dirac-Brueckner-Hartree-Fock approach based on projection techniques using the Bonn A potential. The momentum, density, and isospin dependence of the optical potentials and nucleon effective masses are studied. It turns out that the isovector optical potential depends sensitively on density and momentum, but is almost insensitive to the isospin asymmetry. Furthermore, the Dirac mass ${m}_{D}^{*}$ and the nonrelativistic mass ${m}_{\mathit{NR}}^{*}$ which parametrizes the energy dependence of the single particle spectrum, are both determined from relativistic Dirac-Brueckner-Hartree-Fock calculations. The nonrelativistic mass shows a characteristic peak structure at momenta slightly above the Fermi momentum ${k}_{F}$. The relativistic Dirac mass shows a proton-neutron mass splitting of ${m}_{D,n}^{*}l{m}_{D,p}^{*}$ in isospin asymmetric nuclear matter. However, the nonrelativistic mass has a reversed mass splitting ${m}_{\mathit{NR},n}^{*}g{m}_{\mathit{NR},p}^{*}$ which is in agreement with the results from nonrelativistic calculations.