权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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^+）反应产生的超核进行了广泛的分析。除了使用可靠的Cohen-Kurath型波函数外，新的框架还从包含自旋翻转分量的基本振幅开始应用。成功地解释了现有的反应数据。此外，我们不仅可以预测各种反应截面，还可以预测λ自旋极化能力。阐明了这些过程的特点是非常有用的。(2)系统地计算了超原子核宽区域（3<A<209）的子衰变速率。采用一致顶点重整化的全形式的介子光势，提供了标准的估计。我们指出了泡利抑制和介子畸变引起的恢复之间有趣的相互作用。对于p-和sd-壳区，我们发现了一个显著的壳结构。对于非常轻的LAMBDA-和LAMBDA-超核，在Kapur-Peierls框架下计算了三体上界终态的连续介子谱。与现有资料比较，结果令人满意。(3)利用微观团簇模型，对典型的SIGMA -超核（A= 4,7,9）在耦合电荷多态组态下进行了细致的分析。在预测SIGMA^7Li中SIGMA束缚基态时，发现不是简单的Lane项而是强自旋-同位旋耦合起重要作用。(4)基于局部密度近似和统计方法对双lambda复合核的形成和破碎进行了理论处理。此外，还分析了准自由XI^-吸收的类似过程，得到了LAMBDA-和LAMBDA-超碎片的质量分布。(6)对高能核核碰撞的超核和奇异粒子产生速率进行了理论估计，讨论了Dubna Less的实验数据