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Research in many-particle dynamics in response and reaction of unstable nuclei

不稳定核反应的多粒子动力学研究

基本信息

批准号：
17540231
负责人：
NAKATSUKASA Takashi
金额：
$ 2.39万
依托单位：
The Institute of Physical and Chemical Research (2007)University of Tsukuba (2005-2006)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

项目摘要

(1) Linear response calculations in the continuum in real time and real spaceTime-dependent density-functional theory (TDDFT) with the absorbing boundary condition has been developed and applied to photoabsorption cross section in stable and unstable nuclei. The finite amplitude method (FAM) was also proposed for a new method of RPA solution. Using the Skyrme functional, nuclei up to Nickel isotopes have been. calculated.(2) Large-amplitude (non-linear) dynamics in TDDFTAdiabatic self-consistent collective coordinate method has been applied to realistic nuclear problems of shape-coexistence phenomena, for the first time. Excitation spectra and transition probabilities were calculated.(3) Low-lying excitation spectra with extended Skyrme functionalThe Skyrme functional has been extended by the superposition of randomly generated Slater determinants. Excitation spectra in stable nuclei were well reproduced with this method. Its application to unstable nuclei are in progress.(4) Real-time response and reaction in few-body modelsFor one-neutron-halo nuclei, we have calculated fusion cross section. It turned out that the fusion cross section is reduced by the presence of a halo neutron. This conclusion is opposite to most of other calculations. Recent experiment seems to support our results. For two-neutron-halo nuclei (6He and 11Li), we have calculated El strength distribution. Coulomb breakup experiments for 11Li cannot be reproduced in our calculation.

(1)本文发展了具有吸收边界条件的真实的时密度泛函理论（TDDFT），并将其应用于稳定核和不稳定核的光吸收截面的计算。提出了一种求解RPA的新方法--有限振幅法。使用Skyrme泛函，原子核直到镍同位素都被计算过。计算了(2)首次将TDDFTA非绝热自洽集体坐标方法中的大振幅（非线性）动力学应用于形状共存现象的实际核问题。计算了激发光谱和跃迁几率。(3)具有扩展Skyrme泛函的低激发光谱Skyrme泛函通过叠加随机生成的斯莱特行列式而扩展。用这种方法很好地再现了稳定核的激发谱。它在不稳定核中的应用正在进行中。(4)在少体模型中的实时响应和反应对于单中子晕核，我们计算了熔合截面。事实证明，聚变截面因晕中子的存在而减小。这一结论与大多数其他计算结果相反。最近的实验似乎支持我们的结果。对于双中子晕核（~ 6 He和~（11）Li），我们计算了El强度分布。在我们的计算中不能再现11 Li的库仑破裂实验。