论文标题
作用于裂变片段的扭矩的微观描述
Microscopic description of the torque acting on fission fragments
论文作者
论文摘要
当在裂变衰减中产生两个碎片时，核和库仑相互作用引起的任何扭矩都可以改变片段的角动量。本文使用时间依赖性的Hartree-fock理论探讨了角动量的特征和大小，这是围绕分离点的初始条件的函数。为了了解作用在碎片上的扭矩，冷冻的Hartree-fock方法还用于确定分裂时的集体潜力。研究了两个$^{240} $ pu裂变通道（$^{132} $ sn+$^{108} $ ru和$^{144} $ ba+$^{96} $ sr）。这两个通道涵盖了碎片的不同形状（球形，四极和八杆）。发现裂变后库仑相互作用产生的角动量主要是集体的，而在分裂时产生的角动量并非如此。讨论了旋转模式（弯曲，蠕动和扭曲）之间的竞争，并表明角动量主要垂直于裂变轴。
When two fragments are created in a fission decay, any torque due to nuclear and Coulomb interaction can change the fragment's angular momentum. This article explores the character and magnitude of the angular momentum as a function of the initial conditions around the scission point using the time-dependent Hartree-Fock theory. To understand the torque acting on the fragments, the Frozen Hartree-Fock method is also used to determine the collective potential at scission. Two $^{240}$Pu fission channel ( $^{132}$Sn+$^{108}$Ru and $^{144}$Ba+$^{96}$Sr ) are studied. These two channels cover different shapes (spherical, quadrupole, and octupole deformation) of the fragments. It is found that the angular momentum generated by the Coulomb interaction after fission is mainly collective, while this is not the case for the angular momentum generated at scission. The competition between rotational modes (bending, wriggling, and twisting) is discussed and shows that the angular momentum is generated mainly perpendicular to the fission axis.
