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Hypernuclei and Deep Hole States

超核和深孔态

基本信息

批准号：
05804011
负责人：
IKEDA Kiyomi
金额：
$ 1.09万
依托单位：
Niigata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05804011/
关键词：
deep hole state strangeness S = -2 transfer reaction XI Hypernucleus double LAMBDA Hypernucleus Selection rule of decay from s-hole state fragmentation spectroscopic factor of deep hole state production-decay probability 二重∧Λハイパー核

项目摘要

In the project, we have studied the following items ;(1) the study on the production mechanism of the single and double LAMBDA-hypernuclear excited states accompanying with the deep s-hole nuclear excitation, (2) the numerical proof of the selection rule for fragmentation in light nuclei that the s-hole states can decay into the channels of non-a nuclei such as the ^3He and ^3H decay channels, (3) the calculations of the spectroscopic factors and partial widths for all the energetically allowed two-body channels of the s-hole states of light nuclei and of the LAMBDA-and LAMBDALAMBDA-hypernuclei with similar configuration and (4) the study on the whole lives of the S = -2 hypernuclei ; production (XI-hypernuclei), conversion (XIp*LAMBDALAMBDA) and decay (fragmentation) processes which can be studied on the bases of the above mentioned investigations (1)-(3).The main results are summarized briefly :(1). We have studied the conversion processes into double LAMBDA-hypernuclei from XI-hyper … More nuclei for typical cases, in which the dominant conversion probability are found to be that into the states with the deep s-hole excitation. (2). We have succeeded in calculating the spectroscopic factors and reduced widths of the s-hole nuclear states for all the two body decay channels. We can confirm the selection rule for fragmentation that s-hole states in light nuclei can befragmented into non-alpha channels such as ^3He or t, while the fragmentation into alpha is largely suppressed. This selection rule is also shown to be valid for hypernuclear fragmentation. (3). We have studied decay widths of s-hole nuclear and hypernuclear states. We have an important recognition that the total width of the s-hole state in light nuclei consists mainly of the decay width but not of spreading width in contrast to the deep hole states in heavy nuclei. We have proposed the experimental studies on the fragment decays from the s-hole state in light nuclei, of which the experimental project has been accepted in RCNP of Osaka University. (4). Based on the above mentioned studies 1.-3., we have made the study on what kinds of LAMBDA and LAMBDALAMBDA hypernuclei can be produced and how much can be expected to produce those hypernuclei by (K^-, K^+). This study clarifies the interconnection between the observe quantities and the YN and YY effective interactions which have not been known. We put strongly in anticipation of the experiments in KEK and BNL. Less

在项目中，我们研究了以下几个方面的内容；(1)伴随着深S空穴核激发的单、双波长超核激发态产生机制的研究；(2)轻核碎裂选择规则的数值证明，即S空穴态可以衰变到非a核的通道，如~3He和~3H衰变通道；(3)轻核S空穴态和具有相似构型的λ和LAMBDA-超核的所有能量允许两体通道的光谱因子和偏宽的计算；(4)S=-2超核的全寿命研究；可在上述研究的基础上研究的产生(XI-超核)、转化(XIP*LAMBDALAMBDA)和衰变(碎裂)过程(1)-(3)。主要结果概述如下：(1)。我们研究了从XI-超…到双层超核的转换过程典型情况下核数较多，其中主要的转换几率是进入深S空穴激发态的几率。(2)。我们成功地计算了所有两个体衰变通道的S空穴核态的光谱因子和约化宽度。证实了轻核中的S空穴态可以碎裂成非α通道，如^3He或t，而碎裂成α的碎片在很大程度上被抑制了。这个选择规则也被证明对超核碎裂是有效的。(3)。我们研究了S空穴核态和超核态的衰变宽度。我们有一个重要的认识，与重核中的深空穴态相比，轻核中S空穴态的总宽度主要由衰变宽度组成，而不是扩散宽度。我们提出了对轻核中S空穴态碎片衰变的实验研究，该实验项目已被大阪大学核子研究中心接受。(4)。在上述研究的基础上，1.-3.我们研究了(K^-，K^+)能产生什么样的Lambda和LAMBDALAMBDA超核，以及能产生多少超核。这项研究阐明了观察量与YN和YY有效相互作用之间的联系，这些相互作用是未知的。我们对KEK和BNL的实验提出了强烈的期望。较少