INCOMPRESSIBILITY OF ASYMMETRIC NUCLEAR MATTER

LIE-WEN CHEN, BAO-JUN CAI, CHUN SHEN, CHE MING KO, JUN XU, BAO-AN LI
<span title="">2010</span> <i title="World Scientific Pub Co Pte Lt"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/ktgmvihw65hb5klkqomppjtrri" style="color: black;">International Journal of Modern Physics E</a> </i> &nbsp;
The incompressibility K_sat(δ) of isospin asymmetric nuclear matter at its saturation density. Our results show that in the expansion of K_sat(δ) in powers of isospin asymmetry δ, i.e., K_sat(δ )=K_0+K_sat,2δ^2+K_sat,4δ^4+O(δ^6), the magnitude of the 4th-order K_sat,4 parameter is generally small. The 2nd-order K_sat,2 parameter thus essentially characterizes the isospin dependence of the incompressibility of asymmetric nuclear matter at saturation density. Furthermore, the K_sat,2 can be
more &raquo; ... sed as K_sat,2=K_sym-6L-J_0/K_0L in terms of the slope parameter L and the curvature parameter K_sym of the symmetry energy and the third-order derivative parameter J_0 of the energy of symmetric nuclear matter at saturation density, and we find the higher order J_0 contribution to K_sat,2 generally cannot be neglected. Also, we have found a linear correlation between K_sym and L as well as between J_0/K_0 and K_0. Using these correlations together with the empirical constraints on K_0 and L, the nuclear symmetry energy E_sym(ρ_0) at normal nuclear density, and the nucleon effective mass, we have obtained an estimated value of K_sat,2=-370 +- 120 MeV for the 2nd-order parameter in the isospin asymmetry expansion of the incompressibility of asymmetric nuclear matter at its saturation density.
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