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Monte-Carlo Shell Model

蒙特卡罗壳模型

基本信息

批准号：
13002001
负责人：
OTSUKA Takaharu
金额：
$ 335.3万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Specially Promoted Research
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2005
项目状态：
已结题

项目摘要

The purpose of this project was to study unknown structure of unstable nudei which are quantum many-body systems, and to explore hidden effects of the nuclear force in nuclei. Moreover we aimed to reveal new many-body mechanisms which may appear in the unstable regions. For these purposes, we performed unified systematic studies of the nuclei in broad regions of the nuclear chart including unstable nuclei, based on the Monte-Carlo Shell Model method and other relevant approaches. We acquired a massive parallel computer system consisting of 232 CPUs for the numerical simulation of a quantum many-body system. The Monte-Carlo Shell Model enables us to perform various calculations which had not yet been made possible by other conventional methods.As a result, in the region of nuclei whose proton number (Z) is around 10, we found the mechanism which makes the neutron magic number N=20 disappears and a new magic number N=16 emerges. We also evaluated quantitatively how the mechanism affects … More the energy spectra and the electromagnetic moments, and provided with the precise predictions of the places where the magic number will be changed. We succeeded in the unified description of the pf shell nuclei, for the first time, evaluating the Gamow-Teller transition strength, and applying it to astrophysics. We have carried out microscopic studies of heavy nuclei whose masses are around 130, performing the theoretical calculation of energy levels, electromagnetic transition probabilities and moments, in good agreement with the experimental values. We also discovered the shell evolution emerged by the tensor force, presenting exotic features of the structure of the unstable nuclei, caused primarily by the shell evolution. Inaddition, much other achievement has been done such as the discovery of the triangular shape of nuclei. So far, 70 original papers have been published.This project promoted collaborations with many research groups including those outside Japan, and made significant contributions to international conferences including 78 invited talks. With the rapid developments and the diversity of the studied subjects, we employed young physicists, and held an international symposium at the end of the term. Less

该项目的目的是研究量子多体系统不稳定原子核的未知结构，并探索原子核中核力的隐藏效应。此外，我们的目标是揭示新的多体机制，可能出现在不稳定的区域。为此，我们基于蒙特-卡罗壳模型方法和其他相关方法，对包括不稳定核在内的核图的广泛区域中的核进行了统一的系统研究。我们获得了一个由232个CPU组成的大规模并行计算机系统，用于量子多体系统的数值模拟。蒙特-卡罗壳模型使我们能够进行用其它常规方法所不能进行的各种计算，结果发现在质子数（Z）为10左右的核区，中子幻数N=20消失而出现新幻数N=16的机制。我们还定量评估了该机制如何影响 ...更多信息能谱和电磁矩，并提供了精确的预测的地方，幻数将被改变。我们成功地统一描述了pf壳层核，首次计算了Gamow-Teller跃迁强度，并将其应用于天体物理。我们对质量在130左右的重核进行了微观研究，进行了能级、电磁跃迁几率和跃迁矩的理论计算，与实验值符合较好。我们还发现了由张量力引起的壳层演化，呈现出主要由壳层演化引起的不稳定核结构的奇异特征。此外，还取得了许多其他成就，如三角形核的发现。迄今为止，发表了70篇原创论文。本项目促进了与日本以外的许多研究团体的合作，并对包括78次特邀演讲在内的国际会议做出了重大贡献。随着学科的迅速发展和学科的多样性，我们聘请了年轻的物理学家，并在学期末举办了一次国际研讨会。少