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.

我们利用蒙特卡洛壳模型研究了各种原子核的结构，研究了N=20附近的不稳定原子核的结构，计算范围涵盖了偶偶原子核的亚拉斯特态和一般的奇A原子核的非亚拉斯特态。 yrast态的一些结果已经通过实验得到了验证，对于奇数A核，已经进行了计算。特别是，我们成功地计算了F同位素的滴线，不稳定核中N=20时壳层间隙的减小是我们理论研究的重点，也是F同位素滴线延长的原因。提出了一种关于不稳定核中幻数的新理论，并预测了新的幻数。对于 pf 壳核，其中间部分的核通过基于 G 矩阵和经验调整创建了新的有效相互作用。。现在可以描述大约100个原子核，这对于r过程和rp过程的研究很重要。已经研究了^<56>Ni的球形基态、变形能带和超变形能带。这项研究正在扩展到原子核。 A=50-100，首次在阿尔法8工作站等计算机上描述了形状相变和γ不稳定变形。 21164 和 4 个带有 Alpha 21264 的工作站已被用作并行处理器。已经执行了传统的计算，产生了 ^<16>O 中的封闭壳的破裂结果。