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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.

我们用蒙特卡罗壳模型研究了各种核的结构。研究了N=20附近核的不稳定性。计算范围从偶偶核的yrast态到奇A核和一般核的non-yrast态。对Yrast态的一些结果已经得到实验的验证。能级、电磁跃迁矩阵元、磁矩有待确认。对于奇A核，对F和Na同位素进行了计算。特别是，我们已经成功地在会计滴线的F同位素。不稳定核在N=20时壳层能隙的减小是我们理论研究的重点，也是F同位素滴线远延的原因。本文提出了一个新的不稳定核幻数理论，并预言了新的幻数。对于pf壳层核，通过经验调整，在G矩阵的基础上，中间部分的核通过产生新的有效相互作用而变得负责。现在大约有100个核可以被描述，它们在r过程和rp过程的研究中是重要的。研究了^ Ni的球形基态、形变带和超形变带<56>。这项研究正在扩展到A=50-100的原子核。对于重核，首次从微观上描述了形状相变和γ不稳定形变。计算机，如8个工作站与阿尔法21164和4个工作站与阿尔法21264已获得作为并行处理器。已经实施了对基方法。进行了常规计算，得到了^ O中闭合壳层破裂的结果<16>。