Isospin dependence of nuclear matter symmetry energy coefficients

✍ Scribed by Fábio L. Braghin

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 135 KB
• Volume: 696
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(01)01144-7

✦ Synopsis

Generalized symmetry energy coefficients of asymmetric nuclear matter are obtained as the screening functions. The dependence of the isospin symmetry energy coefficient on the neutronproton (n-p) asymmetry may be determined unless by a constant (exponent) Z which depends on microscopic properties. The dependence of the generalized symmetry energy coefficients with Skyrme forces on the n-p asymmetry and on the density, only from 0.5 up to 1.5 ρ 0 , are investigated in the isospin and scalar channels. The use of Skyrme-type effective forces allows us to obtain analytical expressions for these parameters as well as their dependences on the neutron-proton (n-p) asymmetry, density and even temperature. Whereas the density dependence of these coefficients obtained with Skyrme forces is not necessarily realistic the dependence on the n-p asymmetry exhibit a more consistent behaviour. The isospin symmetry energy coefficient (s.e.c.) increases as the n-p asymmetry acquires higher values whereas the isoscalar s.e.c. decreases. Some consequences for the supernovae mechanism are discussed.