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EPJ A - Hadrons and Nuclei
Hadrons and Nuclei


Eur. Phys. J. A 11, 137-141 (2001)

Nuclear matter properties in relativistic mean-field model with ${\sigma}-{\omega}$ coupling

K.C. Chung1, C.S. Wang1, 2, A.J. Santiago1 and J.W. Zhang2

1  Instituto de Física, Universidade do Estado do Rio de Janeiro, Rio de Janeiro-RJ 20559-900, Brazil
2  Department of Technical Physics, Peking University, Beijing 100871, China

chung@uerj.br

(Received: 23 March 2001 Communicated by A. Molinari)

Abstract
The $\sigma$-$\omega$ coupling is introduced phenomenologically in the linear $\sigma$-$\omega$ model to study the nuclear matter properties. It is shown that not only the effective nucleon mass M* but also the effective $\sigma$ meson mass $m_\sigma^*$ and the effective $\omega$ meson mass $m_\omega^*$ are nucleon-density-dependent. When the model parameters are fitted to the nuclear saturation point, with the nuclear radius constant r0=1.14 fm and volume energy a1=16.0 MeV, as well as to the effective nucleon mass M*=0.85M, the model yields $m_\sigma^*=1.09m_\sigma$ and $m_\omega^*=0.90m_\omega$ at the saturation point, and the nuclear incompressibility K0=501 MeV. The lowest value of K0 given by this model by adjusting the model parameters is around 227 MeV.

PACS
21.65.+f - Nuclear matter.
24.10.Jv - Relativistic models.

© Società Italiana di Fisica, Springer-Verlag 2001

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