Study of high energy nuclear reactions based on quantum chromodynamics

基于量子色动力学的高能核反应研究

• 批准号: 05640330
• 负责人: YAZAKI Koichi
• 金额: $ 1.34万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05640330/
• 关键词: NJL model; mean field approach; Faddeev approach; pion exchange; nuclear transparency; color transparency; relativistic harmonic oscillator model; H-dibaryon; NJL模型; 相対論的Faddeev方程式; nuclear transparency; colar transparency; 核子の内部構造; Faddeev方程

High energy nuclear reaction has two aspects, one related to perturbative QCD through elementary processes at large momentum transfers and the other related to non- perturbative QCD through the internal structure of participating hadrons and their initial and final state interactions. In this research project, the Nambu Jona- Lasino model has been studied as a relativistic model of the nucleon internal structure. The nuclear transparency which is a measure of initial and final state interactions and the H-dibaryon in nuclear matter have been also studied as means of observing the internal structure in high energy reactions.In the study of the NJL model, we have calculated the quark scalar density, the axial vector coupling constant and the magnetic moment of the nucleon in order to examine the properties of the solution for th relativistic Faddeev equation and confirmed that the observed properties of the nucleon are globally reproduced. We have also made a comparison between the three … More -quark picture based on the Faddeev approach and the soliton picture based on the mean field approach. It has been found that the inclusion of the two-body correlation in the mean field approach may solve the long-standing problem about the stability of the solution and the pion exchange between the quarks gives an important contribution in the Faddeev approach.As for the nuclear transparency, the relativistic effect has been found to suppress the expansion rate of the proton squeezed by the large momentum transfer and play an essential role in the color transparency. A relativistic harmonic oscillator quark model has been used to study the above suppression. The extension of the study to the cases of hadronic quasi-elastic processes such as (p, 2p) and (pi, pi'p) are under way.H-dibaryon in nuclear matter has been studied by the Brueckner theory based on the H-nucleon interaction we obtained previously and the effective mass and the well depth have been calculated. The effects of H-LAMBDALAMBDA coupling have been also examined. Less

高能核反应有两个方面，一方面通过大动量转移的基本过程与微扰QCD相关，另一方面通过参与强子的内部结构及其初始和最终状态相互作用与非微扰QCD相关。在本研究项目中，Nambu Jona-Lasino 模型作为核子内部结构的相对论模型进行了研究。作为初态和终态相互作用的量度的核透明度以及核物质中的氢二重子也被作为观察高能反应内部结构的手段进行了研究。在NJL模型的研究中，我们计算了夸克标量密度、轴矢量耦合常数和核子磁矩，以检验相对论Faddeev方程解的性质，并证实了观测到的 核子的特性在全局范围内再现。我们还对基于法捷耶夫方法的三夸克图和基于平均场方法的孤子图进行了比较。研究发现，在平均场方法中加入二体相关性可以解决长期存在的解的稳定性问题，而夸克之间的π介子交换在Faddeev方法中做出了重要贡献。在核透明性方面，发现相对论效应抑制了大动量传递挤压的质子的膨胀率，在颜色透明性中发挥了重要作用。相对论谐振子夸克模型已被用来研究上述抑制。研究范围正在扩展到(p, 2p)和(pi, pi'p)等强子准弹性过程的情况。基于我们之前获得的H-核子相互作用，利用Brueckner理论对核物质中的H-二重子进行了研究，并计算了有效质量和井深。还检查了 H-LAMBDALAMBDA 偶联的影响。较少的

项目成果

H. Asami: "Static properties of the nucleon in the Faddeev approach based on the Namub-Jona-Lasinio model" Phys. Rev. C. 51. 3388-3392 (1995)

H. Asami：“基于 Namub-Jona-Lasinio 模型的 Faddeev 方法中核子的静态特性” Phys。

Y.Yazaki: Nuclear transparency in high energy reactions. World Scientific, 32-42 (1995)

Y.Yazaki：高能反应中的核透明度。

小浜洋央,矢崎紘一,関亮一: "Anomalous mass number dependence of nuclear transparency" Physics Letters B. 344. 61-66 (1995)

Hirooka Obama、Koichi Yazaki、Ryoichi Seki：“核透明度的反常质量数依赖性”《物理快报》B. 344. 61-66 (1995)

K.Yazaki: QCD,hadrons and nuclei. World Scientific, 87-119 (1995)

K.Yazaki：QCD、强子和原子核。

小浜洋央: "Aromalous mass number dependence of nuclear transparency" Progress of Theoretical Physics Supplement. 120. 277-282 (1995)

Hiroo Obama：“核透明度的芳香质量数依赖性”理论物理进展增刊 120. 277-282 (1995)。