Theoretical Study of Hypernuclear Physics

超核物理理论研究

基本信息

批准号：
02044042
负责人：
MOTOBA Toshio
金额：
$ 1.28万
依托单位：
Osaka Electro-Communication University
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

(1) Extensive analyses have been performed for the hypernuclear production by all the (K^-, pi^-), (pi^+, K^+) and (gamma, K^+) reactions on the p-shell nuclear targets. In addition to the use of reliable Cohen-Kurath type wave functions, the new framework was applied by starting with the elementary amplitudes including the spin-flip component. The existing reaction data are successfully explained. Furthermore we can predict not only various reaction cross sections but also the LAMBDA -spin polarization abilities. The characteristics of these processes are clarified to be very useful.(2) The Pionic decay rates-are systematically evaluated for wide region of hypernuclei 3<A<209). The full form of pion optical potential is employed with the consistent vertex renormalization, which provides the standard estimates. We pointed out an interesting interplay between the Pauli-suppression and the restoration due to pion distortion. For p- and sd-shell regions, we found a remarkable shell-struct … More ure dependence. For very light LAMBDA- and LAMBDA LAMBDA-hypernuclei, the continuum pion spectra for the three-body upbound final states are calculated in the Kapur-Peierls framework. The comparison with existing data are satisfactory.(3) Using the microscopic cluster model, typical SIGMA -hypernuclei ( A=4, 7, 9) are carefully analyzed within the configuration of coupled charge-multiplet states. Not the simple Lane term but the strong spin-isospin coupling is found to play an important role in predicting the SIGMA -bound ground state in SIGMA^7Li.(4) The formation and fragmentation of double-LAMBDA compound nucleus are theoretically treated on the basis of the local density approximation and the statistical method. Furthermore the similar process from quasi-free XI^- absorption is also analyzed to get the mass distribution of LAMBDA- and LAMBDA LAMBDA-hyperfragments.(6) The hypernuclear and strange-particle production rates in high-energy nucleusnucleus collisions are theoretically estimated to discuss the experimental data from Dubna Less

(1) 对 p 壳核靶上所有 (K^-, pi^-)、(pi^+, K^+) 和 (gamma, K^+) 反应的超核产生进行了广泛的分析除了使用可靠的科恩-库拉斯型波函数之外，还从包括自旋翻转分量在内的基本振幅开始应用新框架，此外，我们不仅可以预测反应的各种交叉。部分以及 LAMBDA -自旋极化能力。这些过程的特征被证明是非常有用的。(2)系统地评估了超核3<A<209)的宽区域的π介子光学势。一致的顶点重整化，它提供了标准估计，我们指出了由于 p 介子畸变而导致的泡利抑制和恢复之间的有趣相互作用，我们发现了一个显着的壳结构。 …更多的ure依赖性。对于非常轻的LAMBDA-和LAMBDA-LAMBDA-超核，在Kapur-Peierls框架中计算了三体上行最终态的连续介子光谱，与现有数据的比较是令人满意的。(3)微观团簇模型，典型的 SIGMA 超核（A=4,7,9）在耦合电荷多态的配置中进行了仔细分析，不是简单的 Lane 术语，而是。发现强自旋-同位旋耦合对于预测SIGMA^7Li中的SIGMA束缚基态具有重要作用。(4)基于局域密度近似理论处理双LAMBDA复合核的形成和碎裂此外，还分析了准自由XI^-吸收的类似过程，得到了LAMBDA-和LAMBDA LAMBDA-超碎片的质量分布。(6)从理论上估计高能核子碰撞中的超核和奇异粒子产生率，以讨论来自 Dubna Less 的实验数据