arXiv 0904.30472009-04nucl-th

$^{238}$ U原子核的碰撞动力学

Collision dynamics of two $^{238}$U atomic nuclei

Cédric Golabek, Cédric Simenel

备注：: Accepted for publication in Physical Review Letter
发表信息：: Phys.Rev.Lett.103:042701,2009
DOI：: 10.1103/PhysRevLett.103.042701

摘要：

锕系原子核的碰撞在几个$10^{-21}$ s的非常短的时间内形成了地球上最重的相互作用核子系。这种非常重的离子碰撞已经被提出作为产生重元素和超重元素的替代方法。这些碰撞也被用来通过大量相互作用的质子产生超强电场，以测试量子电动力学理论预测的自发正电子-电子（$e^+e^-$）对发射。用含时Hartree-Fock理论研究了两个$^{238}$ U原子核的碰撞动力学。特别强调了核形变对碰撞时间和核子转移等反应机制的作用。这些计算结果对于transmermium元素（$Z>100$）的生产来说是悲观的。然而，最高的碰撞时间（$\sim4\times10^{-21}$ s在1200 MeV）应允许自发$e^+e^-$发射的实验签名。令人惊讶的是，我们也观察到三元裂变由于纯粹的动力学效应。

英文摘要：

Collisions of actinide nuclei form, during very short times of few $10^{-21}$ s, the heaviest ensembles of interacting nucleons available on Earth. Such very heavy ions collisions have been proposed as an alternative way to produce heavy and superheavy elements. These collisions are also used to produce super-strong electric fields by the huge number of interacting protons to test spontaneous positron-electron ($e^+e^-$) pair emission predicted by the quantum electrodynamics theory. The time-dependent Hartree-Fock theory which is a fully microscopic quantum approach is used to study collision dynamics of two $^{238}$U atomic nuclei. In particular, the role of nuclear deformation on collision time and on reaction mechanisms such as nucleon transfer is emphasized. These calculations are pessimistic in terms of transfermium elements ($Z>100$) production. However, the highest collision times ($\sim4\times10^{-21}$ s at 1200 MeV) should allow experimental signature of spontaneous $e^+e^-$ emission. Surprisingly, we also observe ternary fission due to purely dynamical effects.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

相关论文