Analyses of Hypernuclear Production and Pionic Decay Reactions

对p壳层核靶上的(K^-，pi^-)、(pe^+，K^+)和(Gamma，K^+)反应的超核产生进行了广泛的理论分析。我们使用在扩展的Cohen-Kurath类型计算中获得的可靠的超核波函数。理论处理中的第二个改进是从包括自旋翻转分量在内的基本振幅开始。我们的模型在新的框架下成功地解释了现有的反应数据。此外，我们不仅可以预测不同的反应截面，还可以预测这三个反应的极化能力。这些过程的特征在未来的超核光谱中是非常有用的。系统地评估了大范围超核：S壳、p壳、SD壳和直到铅区的典型重系统的介子弱衰减率。在一致的顶点重整化条件下，采用了完全形式的π-核光学势。因此，我们给出了轻到重超核的介子衰变的标准理论估计。对于重系统，我们讨论了泡利阻塞和由于介子扭曲引起的作为质量数函数的恢复之间的有趣的相互作用。对于p-壳层和SD-壳层区域，我们强调了显著的壳层结构相关性，这在详细分析中应该是有用的。在Kapur-Peierls方法的框架下，对极轻的Lambda-和Lambda-Lambda超核，计算了三体非束缚末态的连续谱。与现有数据的对比是令人满意的。

The extensive theoretical analyses have been performed for the hypernuclear production by all the (K^-, pi^-), (pe^+, K^+) and (gamma, K^+) reactions on the p-shell nuclear targets. We use the reliable hypernuclear wave functions obtained in the extended Cohen-Kurath type calculations. The second improvement in the theoretical treatment has been exploited by starting with the elementary amplitudes including the spin-flip component. The existing reaction data are successfully explained by our model with new framework. Furthermore we can predict not only various reaction cross sections but also the polarization abilities of the three reactions. The characteristics of these processes are clarified to be very useful in future hypernuclear spectroscopy.The pionic weak decay rates are systematically evaluated for wide region of hypernuclei : s-shell, p-shell, sd-shell and typical heavy systems up to the lead region. The full form of pion-nucleus optical potential is employed with the consistent vertex renormalization. Thus we present the standard theoretical estimates of pionic decays for light-to heavy hypernuclei. For heavy systems, we discussed an interesting interplay between the Pauli blocking and the restoration due to pion distortion as a function of mass number. For p-shell and sd-shell region, we emphasized a remarkable shell-structure dependence which should be useful in the detailed analysis. For very light LAMBDA- and LAMBDA LAMBDA-hypernuclei, the continuum pion spectra for the three-body unbound final states are calculated in the frame work of Kapur-Peierls method. The comparison with existing data are satisfactory.