扭曲边界条件下核碰撞中的连续介质阻尼效应
Continuum damping effects in nuclear collisions associated with twisted boundary conditions
摘要：
用含时Skyrme Hartree-Fock方法研究了$^{24}$ Mg + $^{24}$ Mg碰撞.扭曲的边界条件，可以避免有限的盒子大小的影响，所采用的三维坐标空间，已经实现。为了研究复合核$^{48}$ Cr的振动和旋转，将长轴变形的$^{24}$ Mg设定为不同的取向。我们的时间演化结果表明，连续阻尼效应与扭转平均边界条件发挥了持久的作用后融合阶段。特别地，在扭转平均边界条件和吸收边界条件的计算中，提出了连续体中的旋转阻尼，其中阻尼宽度可以清楚地提取。在连续统中，旋转的复合核向球形演化，但仍具有相当大的角动量，这是不寻常的。
英文摘要：
The time-dependent Skyrme Hartree-Fock calculations have been performed to study $^{24}$Mg +$^{24}$Mg collisions. The twisted boundary conditions, which can avoid finite box-size effects of the employed 3D coordinate space, have been implemented. The prolate deformed $^{24}$Mg has been set to different orientations to study vibrations and rotations of the compound nucleus $^{48}$Cr. Our time evolution results show continuum damping effects associated with the twist-averaged boundary condition play a persistent role after the fusion stage. In particular, a rotational damping in continuum is presented in calculations of both twist-averaged and absorbing boundary conditions, in which damping widths can be clearly extracted. It is unusual that the rotating compound nucleus in continuum evolves towards spherical but still has a considerable angular momentum.
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