Structure of Rotating Nuclei and Non-linear Collective Dynamics

旋转核的结构与非线性集体动力学

基本信息

批准号：
01044037
负责人：
SAKATA Fumihiko
金额：
$ 8.64万
依托单位：
Institute for Nuclear Study, University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

项目摘要

INS-NBI cooperative research project on High-Spin Physics had started in 1987. In 1988, Japanese group installed five ACS-BGO detectors into the Tandem Accelerator Laboratory at Risphi, NBI to form a part of the most powerful multi gamma-ray detection system called NORD-BALL. Japanese group contributed for construction of the heavy-ion postaccelerator at NBI. A silicon detector array (Si-Ball) capable of identifying the reaction channels in heavy-ion reactions was constructed by Japanese group, forming a combined system with Nord-Ball which opened the nuclear spectroscopic experiments at new deformed region of A<approximately equal>The Japanese experimental activity performed in this project is mainly divided into three : (Experimental project I : High-spin states experiment in odd-odd nuclei with A<approximately equal>130) High-spin states of ^<124>Cs have been investigated. The signature inversion in ^<124>Cs turned out to be different from those observed in heavier rare-earth nuclei. A similar signature dependence is observed in ^<126>Cs. Theoretical analysis based on the conventional models can not fully reproduce this new phenomena. (Experimental project II : High-spin experiment in A<approximately equal>80-90 region) By using Nordball-Si ball complex detector system, new level scheme of ^<87>Mo, ^<87>Nb, ^<82>Nb, ^<82>Y, ^<81>Y, ^<82>Zr and ^<82>Sr have been established. In nuclei with N=45 and 46 whose ground state has small deformation, the rapidly rotating states seem to have strong deformation. (Experimental project III : Coulomb Excitation experiments in transitional nuclei) Various coulomb excitation experiments and coulomb-transfer experiment for ^<154>Sm with ^<58>Ni beam were carried out. Various new levels were observed on top of the known bands.There have been made variety of cooperative research activities involving Japanese theoretical nuclear physicists. Various exciting progress are listed in the references.

INS-NBI高旋转物理学合作研究项目于1987年开始。1988年，日本集团在NBI的Risphi的串联加速器实验室中安装了五个ACS-BGO探测器，以组成最强大的多伽马射线检测系统的一部分。日本集团为NBI的重型离子后加速器的建设做出了贡献。日本组构建了一个能够鉴定重离子反应中能够识别反应通道的硅探测器阵列（SI-BAL），形成了与Nord-Ball的组合系统，该系统在<<<<<<<<<<<<<<<<of的新项目的新变形区域上的核光谱实验>在该项目中执行的日本实验活性的三个典范<splient od-sp-sprient Incirient i：（实验）等于> 130）已经研究了 ^<124> Cs的高旋转状态。 ^<124> CS中的签名反转与在较重的稀土核中观察到的签名反转不同。在 ^<126> Cs中观察到类似的签名依赖性。基于常规模型的理论分析无法完全再现这种新现象。（实验项目II：在A <大约相等> 80-90区域中的高旋转实验）通过使用Nordball-Si Ball复合探测器系统， ^<87> Mo， ^<87> nb， ^<87> nb， ^<82> nb， ^<82> y， ^<82> y， ^<81> y， ^<81> y， ^<81> y， ^<81> y， ^<82> zr和 ^82> sr的新水平方案已建立。在n = 45和46的核中，其基态的变形较小，迅速旋转的状态似乎具有很强的变形。（实验项目III：过渡核中的库仑激发实验）进行了各种库仑激发实验和使用 ^<154> SM的库仑转移实验，并进行了 ^<58> ni梁的SM。在已知的频段之上观察到各种新的水平。已经制作了涉及日本理论核物理学家的各种合作研究活动。参考文献中列出了各种令人兴奋的进度。