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Constraints on the symmetry energy and its associated parameters from nuclei to neutron stars

机译:对称能量的约束及其与中子颗粒核的相关参数

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The symmetry energy obtained with the effective Skyrme energy density functional is related to the values of isoscalar effective mass and isovector effective mass, which is also indirectly related to the incompressibility of symmetric nuclear matter. In this work, we analyze the values of symmetry energy and its related nuclear matter parameters in five-dimensional parameter space by describing the heavy ion collision data, such as isospin diffusion data at 35 MeV/u and 50 MeV/u, neutron skin of Pb-208, and tidal deformability and maximum mass of neutron star. We obtain the parameter sets which can describe the isospin diffusion, neutron skin, tidal deformability, and maximum mass of neutron star, and give the incompressibility K-0 = 250.23 +/- 20.16 MeV, symmetry energy coefficient S-0 = 31.35 +/- 2.08 MeV, the slope of symmetry energy L = 59.57 +/- 10.06 MeV, isoscalar effective mass m(s)*/m = 0.75 +/- 0.05, and quantity related to effective mass splitting f(I) = 0.005 +/- 0.170. At two times normal density, the symmetry energy we obtained is in 35-55 MeV. To reduce the large uncertainties of f(I), more critical works in heavy ion collisions at different beam energies are needed.
机译:通过有效的Skyrme能量密度官能团获得的对称能量与isoscalar有效质量和等离子体有效质量的值相关,这也与对称核问题的不可压缩性间接相关。在这项工作中,我们通过描述重离子碰撞数据,例如35 meV / U和50mev / U,中子皮肤,中子皮PB-208,和潮汐变形性和中子星的最大质量。我们获得了可以描述的参数集,可以描述索坦散散,中子皮,潮汐可变形性和最大质量的中子星,并给予不可压缩性K-0 = 250.23 +/- 20.16meV,对称能量系数S-0 = 31.35 + / - 2.08 MEV,对称能量斜率L = 59.57 +/- 10.06 MEV,isoscalar有效质量m(s)* / m = 0.75 +/- 0.05,以及有效质量分裂的数量f(i)= 0.005 + / - 0.170。在正常密度的两倍下,我们获得的对称能量是35-55 MeV。为了减少F(i)的巨大不确定性,需要在不同光束能量的重离子碰撞中进行更关键的作品。

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