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不稳定的nudei的未知结构，该结构是量子多体系统，并探索核力量在核力量中的隐藏作用。此外，我们旨在揭示可能出现在不稳定地区的新的多体机制。为了这些目的，我们基于蒙特卡罗壳模型方法和其他相关方法，在包括不稳定的核图（不稳定的nudei）中对核图表的核核研究进行了统一的系统研究。我们获得了一个由232个CPU组成的大型并行计算机系统，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执行各种计算，这些计算尚未通过其他常规方法实现。作为结果，在核质子数（z）的核区域约为10，我们发现了使中子魔法n = 20消失的机制消失了，而新的魔术数n = 16。我们还定量地评估了机制如何影响……更多的能量光谱和电子力矩，并提供了对魔术数将更改的地方的精确预测。我们首次成功地对PF壳核的统一描述进行了评估，并将其应用于天体物理学。我们已经对重核进行了微观研究，其质量约为130，对能量水平，电磁过渡的可能性和力矩进行了理论计算，并且与实验值非常吻合。我们还发现了张量力出现的壳演化，它呈现出不稳定核结构的外来特征，主要是由壳的演化引起的。陷入困境，已经取得了许多其他成就，例如发现了核的三角形形状。到目前为止，已经发表了70篇原始论文。该项目促进了与包括日本以外的许多研究小组的合作，并为包括78次受邀演讲在内的国际会议做出了重大贡献。随着工作室主题的快速发展和多样性，我们雇用了年轻的物理学家，并在学期结束时举行了国际研讨会。较少的