# Application of density dependent parametrization models to asymmetric nuclear matter

## Abstract

Density dependent parametrization models of the nucleon-meson effective couplings, including the isovector scalar {delta}-field, are applied to asymmetric nuclear matter. The nuclear equation of state and the neutron star properties are studied in an effective Lagrangian density approach, using the relativistic mean field hadron theory. It is known that the introduction of a {delta}-meson in the constant coupling scheme leads to an increase of the symmetry energy at high density and so to larger neutron star masses, in a pure nucleon-lepton scheme. We use here a more microscopic density dependent model of the nucleon-meson couplings to study the properties of neutron star matter and to reexamine the {delta}-field effects in asymmetric nuclear matter. Our calculations show that, due to the increase of the effective {delta} coupling at high density, with density dependent couplings the neutron star masses in fact can be even reduced.

- Authors:

- Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhon 730000 (China)
- (China)
- Laboratori Nazionali del Sud, Via S. Sofia 62, I-95123 Catania (Italy)
- (Italy)
- Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080 (China)
- Institute of Theoretical Physics, College of Applied Sciences, Beijing University of Technology, Beijing 100022 (China)

- Publication Date:

- OSTI Identifier:
- 20995251

- Resource Type:
- Journal Article

- Resource Relation:
- Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevC.75.048801; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ASYMMETRY; COUPLINGS; DENSITY; EQUATIONS OF STATE; ISOVECTORS; LAGRANGIAN FUNCTION; LEPTONS; MASS; MESONS; NEUTRON STARS; NUCLEAR MATTER; NUCLEONS; RELATIVISTIC RANGE

### Citation Formats

```
Liu, B., Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, Toro, M. Di, Greco, V., University of Catania, I-95123 Catania, Shen, C. W., School of Science, Huzhou Teachers College, Huzhou 313000, Zhao, E. G., and Sun, B. X.
```*Application of density dependent parametrization models to asymmetric nuclear matter*. United States: N. p., 2007.
Web. doi:10.1103/PHYSREVC.75.048801.

```
Liu, B., Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, Toro, M. Di, Greco, V., University of Catania, I-95123 Catania, Shen, C. W., School of Science, Huzhou Teachers College, Huzhou 313000, Zhao, E. G., & Sun, B. X.
```*Application of density dependent parametrization models to asymmetric nuclear matter*. United States. doi:10.1103/PHYSREVC.75.048801.

```
Liu, B., Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, Toro, M. Di, Greco, V., University of Catania, I-95123 Catania, Shen, C. W., School of Science, Huzhou Teachers College, Huzhou 313000, Zhao, E. G., and Sun, B. X. Sun .
"Application of density dependent parametrization models to asymmetric nuclear matter". United States.
doi:10.1103/PHYSREVC.75.048801.
```

```
@article{osti_20995251,
```

title = {Application of density dependent parametrization models to asymmetric nuclear matter},

author = {Liu, B. and Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 and Toro, M. Di and Greco, V. and University of Catania, I-95123 Catania and Shen, C. W. and School of Science, Huzhou Teachers College, Huzhou 313000 and Zhao, E. G. and Sun, B. X.},

abstractNote = {Density dependent parametrization models of the nucleon-meson effective couplings, including the isovector scalar {delta}-field, are applied to asymmetric nuclear matter. The nuclear equation of state and the neutron star properties are studied in an effective Lagrangian density approach, using the relativistic mean field hadron theory. It is known that the introduction of a {delta}-meson in the constant coupling scheme leads to an increase of the symmetry energy at high density and so to larger neutron star masses, in a pure nucleon-lepton scheme. We use here a more microscopic density dependent model of the nucleon-meson couplings to study the properties of neutron star matter and to reexamine the {delta}-field effects in asymmetric nuclear matter. Our calculations show that, due to the increase of the effective {delta} coupling at high density, with density dependent couplings the neutron star masses in fact can be even reduced.},

doi = {10.1103/PHYSREVC.75.048801},

journal = {Physical Review. C, Nuclear Physics},

number = 4,

volume = 75,

place = {United States},

year = {Sun Apr 15 00:00:00 EDT 2007},

month = {Sun Apr 15 00:00:00 EDT 2007}

}