Study of Short Range Hyperon Necleon Interaction

短程超子核相互作用研究

基本信息

批准号：
10044086
负责人：
KISHIMOTO Tadafumi
金额：
$ 3.46万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10044086/
关键词：
Hypernuclei Strangeness Weak nonmeonic decay Spin-orbit interaction Baryon-Baryon Interaction Short Range correlation Quark degeree of freedom バリオン間相互作用ハイペロン

项目摘要

It is well known that hadrons (Baryons and mesons) are made up of quarks and gluons by the strong interaction. The interaction among hadrons is not well understood especially due to our inability to describe the quark confinement beased on a known principle. The nucleon interaction is well described by meson exchange theory except at short distances where size of hadrons has to be taken into account in the model. Quark and gluon degrees of freedom have to be present though flexibility of the meson change model forbits to pin down clearly the existence of the freedom. The SU (3) extention of the model should be the best testing gound for many models that describe well the NN interaction. In the present research we forcused our attention to the phenomena which originate short range interaction. Following subjects were studied in this research.(1) Spin-orbit interaction ofィイD313(/)ΛィエD3C was measured.Spin-orbit splitting of Λ hypernuclei is known to be small though no definite value has been given by experiments. We produced ィイD313(/)ΛィエD3C by the (K-, π-) using kaon beam provied by the AGS at BNL and measured the splitting by detecting γ rays. The splitting was found to be 20-40 times smaller than that of nucleons.(2) Parity violation in the weak nonmesonic decay of hypernuclei.Weak nonmesonic decay NΛ→NN has a large momentum transfer that make interaction at short distance vital. We demonstrated production of polarized Λ hypernuclei and weak nonmesonic decay has asymmetric angular distribution corresponding parity violation. The magnitude of the parity violation is found to be inconsistent with meson exchange model. As for the further study we are preparing an experiment to measure the inverse reaction (pn→pΛ) of the weak nonmesonic decay. It is a process to produce strangeness by weak interaction. It has never been challenged. We found that the experiment is feasible by carefully desining the detector.

众所周知，哈德子（Baryons and Mesons）是由强烈的相互作用由夸克和麸质组成的。黑文子之间的相互作用并不理解，尤其是由于我们无法描述以已知原则的刺激性。梅森交换理论很好地描述了核相互作用，除了在模型中必须考虑哈德子大小的短距离。夸克（Quark）和麸质自由度必须存在，尽管介子变化模型的灵活性宽恕了自由的存在。对于许多描述NN相互作用很好的模型的SU（3）范围应该是最佳测试a。在本研究中，我们迫使我们注意源于短距离相互作用的现象。在这项研究中研究了以下受试者。（1）测量了D313（/）λIED3C的自旋轨道相互作用。已知λ高核的旋转 - 轨道分裂很小，尽管实验未定义值。我们使用AGS在BNL时提供的KAON束生产（K-，π-）D313（/）λieD3C，并通过检测γ射线来测量分裂。发现分裂的分裂比核能小20-40倍。（2）弱颈部弱的非分类衰减中的均等违规。耐nomesonic decaynλ→Nn具有较大的动量转移，使短距离的相互作用在短距离处至关重要。我们证明了极化λ超核和弱非渗透衰减的产生，具有不对称的角度分布相应的均等差异。发现违规的大小与介子交换模型不一致。至于进一步的研究，我们正在准备一项实验，以测量弱非分类衰减的反应（Pn→Pλ）。这是一个通过薄弱的互动产生陌生感的过程。它从未受到挑战。我们发现，通过仔细探测检测器，该实验是可行的。

项目成果

期刊论文数量（0）

专著数量（0）

科研奖励数量（0）

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专利数量（0）

S. Ajimura, M. ishikawa, K. Ikeda, T. Kishimoto, A. Okusu, N. Shinkai, Y. Tanaka, H. Ejiri and T. Nakano, T. Nagae, K. Manabe, H. Noumi, M. Sekimoto, and T. Shibata, O. Hashimoto, K. Maeda, and T. Tak: "Asymmetry in Nonmesonic Weak Decay of Polarized 5ィイD

S. Ajimura、M. ishikawa、K. Ikeda、T. Kishimoto、A. Okusu、N. Shinkai、Y. Tanaka、H. Ejiri 和 T. Nakano、T. Nagae、K. Manabe、H. Noumi、M. Sekimoto、T. Shibata、O. Hashimoto、K. Maeda 和 T. Tak：“极化非介声弱衰变中的不对称性”