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）所有（k^ - ，pi^ - ），（pi^+，k^+）和（γ，k^+）反应对P壳核靶标的（k^ - ，pi^ - ），（pi^+，k^+）进行了广泛的分析。除了使用可靠的Cohen-kurath型波函数外，还可以通过包括Spin-Flip组件的基本放大器开始应用新框架。现有的反应数据成功解释了。此外，我们不仅可以预测各种反应横截面，还可以预测lambda -spin极化能力。这些过程的特征被阐明为非常有用。（2）针对高核3 <a <209的广泛区域的开创性衰减率系统地评估。 Pion光电位的完整形式与一致的顶点再生一起携带，这提供了标准估计。我们指出了Pauli抑制与触发失真引起的恢复之间的有趣相互作用。对于P-和SD壳区域，我们发现了一个显着的壳体结构……更加依赖。对于非常轻的lambda和lambda lambda-hypernuclei，在Kapur-Peierls框架中计算了三体起床最终状态的持续旋光光谱。满足了与现有数据的比较。（3）使用微观群集模型，典型的Sigma -Hypernuclei（a = 4、7、9），在耦合电荷 - 群态的配置中仔细分析。并不是简单的车道术语，而是发现强的自旋旋转偶联在预测Sigma^7li中的Sigma结合基态方面起着重要作用。（4）理论上是根据位置密度近似和统计方法的基础来处理双lambda复合核的形成和碎片。此外，还分析了来自准无准XI^ - 吸收的类似过程，以获取Lambda-和Lambda lambda-hyperfragments的质量分布。（6）理论上估计了高能核核碰撞的高核和奇怪的生产率，理论上是从理论上估计的。