Isospin splitting of nucleon eective mass and symmetry energy in isotopic nuclear reactions
Isospin splitting of nucleon eective mass and symmetry energy in isotopic nuclear reactions
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同位素核反应中核子有效质量和对称能的同位旋分裂
DOI：
10.1088/1674-1137/41/10/104104
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发表时间：
2017
影响因子：
3.6
通讯作者：
Zhao-Qing Feng
中科院分区：
文献类型：
--
作者：
Ya-Fei Guo;Peng-Hui Chen;Fei Niu;Hong-Fei Zhang;Gen-Ming Jin;Zhao-Qing Feng
在同位旋和动量相关输运模型下，研究了费米能重离子碰撞中同位旋粒子(核子和轻团簇)的动力学，以约束核子有效质量的同位旋分裂和亚饱和密度下的对称能.讨论了动量相关相互作用中的等标量部分和等矢量部分对同位旋粒子发射的影响，即Mn*=mp*和mn*>；mp*(mn*<；mp*)的质量分裂。在入射能量分别为50 MeV/核子和120 MeV/核子的112锡+112锡和124锡+124锡的同位素核反应中，深入研究了自由核子和轻粒子的单、双中子质子比。结果表明，有效质量分裂和对称能对单比动能谱都有影响，特别是在高能尾部(大于20 MeV)。核子有效质量的同位旋分裂对50 MeV/核子能量下的双比谱影响不大。用费米能重离子碰撞的实验数据约束了γS=0.5的软对称能量。
Within an isospin and momentum dependent transport model, the dynamics of isospin particles (nucleons and light clusters) in Fermi-energy heavy-ion collisions are investigated for constraining the isospin splitting of nucleon effective mass and the symmetry energy at subsaturation densities. The impacts of the isoscalar and isovector parts of the momentum dependent interaction on the emissions of isospin particles are explored, ie, the mass splittings of m n*= m p* and m n*> m p*(m n*< m p*). The single and double neutron to proton ratios of free nucleons and light particles are thoroughly investigated in the isotopic nuclear reactions of 112 Sn+ 112 Sn and 124 Sn+ 124 Sn at incident energies of 50 and 120 MeV/nucleon, respectively. It is found that both the effective mass splitting and symmetry energy impact the kinetic energy spectra of the single ratios, in particular at the high energy tail (larger than 20 MeV). The isospin splitting of nucleon effective mass slightly impacts the double ratio spectra at the energy of 50 MeV/nucleon. A soft symmetry energy with stiffness coefficient of γ s= 0.5 is constrained from the experimental data with the Fermi-energy heavy-ion collisions.(authors)