Quantum Monte Carlo Shell Model

量子蒙特卡罗壳模型

基本信息

批准号：
10304019
负责人：
OTSUKA Takaharu
金额：
$ 23.81万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10304019/
关键词：
Monte Carlo Shell Model Shell Model unstable Nuclei Magic Number QMCD parallel computer pf Shell γ unstable deformation 穀模型モンテカルロ穀模型集団運動有効相互作用 pf穀アイソスピン ^<56>Ni sd殻模型ポテンシャル・エネルギー面 GCM

项目摘要

We have studied the structure of a variety of nuclei by using Monte Carlo Shell Model. Unstable of nuclei around N=20 are studied. The calculations cover from yrast states of even-even nuclei to odd-A nuclei and non-yrast states of general nuclei. Some results for yrast states have been verified already by experiments. Energy levels, elecyromagnetic transition matrix elements, magnetic moments are to be confirmed. As for odd-A nuclei, calculations have been carried out for F and Na isotopes. In particular, we have succeeded in accounting the dripline of F isotopes. The decrease of shell gap at N=20 in unstable nuclei is the major point of our theoretical investigation, and is the cause of the far-extended dripline of F isotopes. A new theory on magic numbers in unstable nuclei has been proposed with predictions of new magic numbers. As for pf-shell nuclei, the nuclei in its middle part have become accountable by creating a new effective interaction based upon G-matrix with empirical adjustments. About 100 nuclei can now be described, which are important in the study of r-process and rp-process. The spherical ground state, deformed band and superdeformed band have been studied for ^<56>Ni. This study is being extended to nuclei with A=50-100. Regarding heavy nuclei, the shape phase transition and γ-unstable deformation have been described microscopically for the first time. Computers such as 8 workstations with Alpha 21164 and 4 workstations with Alpha 21264 have been acquires as parallel processors. The pair-basis method has been implemented. Conventional calculations have been carried out, producing results on the breaking of closed shell in ^<16>O.

我们通过使用蒙特卡洛壳模型研究了各种核的结构。 n = 20左右的核的不稳定是研究的。该计算涵盖了均匀核能到奇数核和普通核的非肌音状态的yrast状态。通过实验已经验证了yrast状态的一些结果。能量水平，电子磁磁过渡矩阵元件，磁矩应得到确认。至于奇数-A核，已经对F和Na同位素进行了计算。特别是，我们成功地会计F同位素的钻线。在不稳定的核中，壳差距下的壳体间隙的减小是我们理论投资的主要点，也是F同位素的远程钻孔的原因。已经提出了关于新魔术数字的不稳定核数中魔术数量的新理论。至于PF-shell核，其中部的核能通过基于G-Matrix进行经验调整的G-Matrix创建新的有效相互作用来负责。现在可以描述大约100个核心，这对于研究R-Process和RP过程很重要。已经研究了 ^<56> ni的球形基态，变形的频带和超染色带。这项研究正在扩展到a = 50-100的核里。关于重型核会，首次在显微镜上描述了形状相变和γ-不稳定变形。诸如具有Alpha 21164的8个工作站和Alpha 21264的4个工作站之类的计算机已被作为并行处理器收购。配对方法已实现。已经进行了常规计算，从而在 ^<16> o中破坏封闭壳的结果。