张量力在^16O＋^16O熔合动力学中的效应

Skyrme Tensor Force in ^(16)O+^(16)O Fusion Dynamics

利用时间相关Hartree-Fock理论和完整Skyrme有效相互作用研究了^(16)O+^(16)O碰撞在库仑位垒附近的熔合动力学。数值计算是在没有任何对称性约束的三维笛卡尔基下完成。将时间相关Hartree-Fock理论和冻结密度近似下的能量密度泛函方法给出的库仑位垒与实验结果进行了比较,发现同位旋标量的张量项能降低自旋饱和体系^(16)O+^(16)O的库仑位垒,而库仑位垒高度随着同位旋矢量的张量项的耦合常数减小而降低。并计算了包含和不包含张量力的^(16)O+^(16)O熔合截面,发现张量力对^(16)O+^(16)O碰撞在库仑位垒附近的熔合动力学影响较小。

The fusion dynamics of^（16）O＋^（16）O around Coulomb barrier has been studied in the timedependent Hartree-Fock（TDHF） theory with the full Skyrme effective interaction. The calculations have been carried out in three-dimensional Cartesian basis without any symmetry restrictions. We have included the full tensor force and all the time-odd terms in Skyrme energy density functional（EDF）.The Coulomb barrier obtained from the dynamical TDHF calculations and EDF with frozen density approximation has been compared with the available experimental data. The isoscalar tensor terms and the rearrangement of other terms are found to decrease the barrier height in the spin-saturated system^16O＋^16O, while the energy of Coulomb barrier tends to decrease as the isovector coupling constant decreases. The fusion cross section for^16O＋^16O collision has been calculated with and without the tensor force. We found that the tensor force has minor effect on the fusion dynamics of^16O＋^16O at the energies around Coulomb barrier.