Study of Many-Particle Correlation in Structure and Reactions of Light Exotic Nuclei

1.不稳定核中多粒子关联的研究在14 C +n+n模型下，研究了16 C中E2跃迁的抑制机制。充分考虑了两个中子的关联运动，它们通过一个真实的势相互作用。阐明了自旋三重态组分在抑制机理中的作用。与实验结果的比较表明，14 C的壳层闭合假设可能并不完美，但必须考虑在一定程度上包括核激发的可能性，为了更全面地了解15 C中的E2跃迁问题。2.不稳定核反应机理的研究由不稳定核，这是假定由核心核和价中子。横截面 关于我们 它包括了弹性散射，包括核的分裂效应和核分裂后的动量分布。所采用的基本理论是程函近似。为了使程函近似适用于像208 Pb这样的重靶，理论中必须加入无发散振幅。结合程函模型和库仑激发的微扰理论，证明了用Monte Carlo积分技术完整计算Glauber多次散射振幅的可行性.这一技术将为用高精度的关联波函数描述高能反应开辟一条道路。3.轻超核的束缚机制和重子-重子相互作用的研究通过明确地考虑Λ-Λ耦合，解决了A=3-5 Λ超核的一个长期存在的问题，即基态能量系统学中观察到的过束缚。张量力在这个问题中起着至关重要的作用。本文用由Kyoto-Niigata小组发展的夸克模型导出的势研究了较大的系统，如^9_ΛBe和^6_<ΛΛ>He。在这项研究中，一个新的框架，以使非局域的，能量依赖的夸克模型势的结构计算中的应用成为可能。少

We summarize the results according to the main subjects of research.1.Study of many-particle correlation in unstable nucleiA mechanism for suppressing the electric E2 transition from the excited state to the ground state in 16C was studied in a 14C+n+n model. The correlated motion of the two neutrons, which interact via a realistic potential, was taken into account fully. The role of spin-triplet component in the suppression mechanism was clarified. A comparison with experiment showed that the assumption of shell closure for 14C may not be perfect but one has to consider the possibility of including the core excitation to some extent, in order to obtain more complete understanding of the issue together with the E2 transition in 15C.2.Study of reaction mechanism with unstable nucleiA computer code was developed to facilitate a calculation of various reaction cross sections induced by unstable nuclei, which is assumed to consist of a core nucleus and a valence neutron. The cross sections … More which are calculable cover the elastic scattering including the breakup effects of the nucleus and the momentum distribution of the core after the breakup. The basic theory employed was an eikonal approximation. To make the eikonal approximation applicable for a heavy target such as 208Pb, a divergence-free amplitude had to be incorporated in the theory. This was performed combining the eikonal model with the perturbation theory of the Coulomb excitation.A feasibility of a complete calculation of the Glauber multiple scattering amplitude was demonstrated with the use of Monte Carlo integration technique. This technique will open a way to describe high-energy reactions using correlated wave functions of high accuracy.3.Study of the binding mechanism of light hypernuclei and the baryon-baryon interactionsA long-standing problem of A=3-5 Λ hypernuclei, the overbinding observed in the systematics of the ground state energies, were resolved by taking into account the ΛΣ coupling explicitly. The tensor force played an essential role in this problem. Larger systems such as ^9_ΛBe and ^6_<ΛΛ>He were studied with the potentials derived from a quark-model developed by Kyoto-Niigata group. In this study, a new framework was developed in order to make the application of the non-local, energy-dependent quark-model potentials possible in structure calculations. Less