The fourth-order symmetry energy of nuclear matter and symmetry energy coefficients of finite nuclei using extended semi-empirical mass formula

摘要

An extended nuclear mass formula has been used by considering the bulk, surface and coulomb contributions to the nuclear mass. In this mass formula, the fourth-order symmetry energy coefficient a(sym, 4)(A) of finite nuclei and fourth-order symmetry energy E-sym,E- 4(rho(0)) of nuclear matter (NM) are related explicitly to the characteristic parameters of NM equation of state (EOS) using finite range effective interaction. The calculations are carried out with Yukawa form of exchange interaction having the same range but with different strengths for interaction between like and unlike nucleon. In this extended mass formula, by approximating a(sym, 4)(A) to a constant c(sym, 4) an explicit relation between a(sym, 4)(A) and fourth-order symmetry energy E-sym,E- 4(rho(0)) is obtained, which provides the possibility to extract information on E-sym,E- 4(rho(0)).