Analyses of Hypernuclear Production and Pionic Decay Reactions

超核产生和π离子衰变反应的分析

基本信息

批准号：
01540254
负责人：
MOTOBA Toshio
金额：
$ 1.34万
依托单位：
Osaka Electro-Communication University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01540254/
关键词：
Hypernucleus Polarization kaon Induced Reaction Pion Induced Reaction Kaon Photoproduction Pionic Decay Weak Interaction Strangeness スピン反応偏極ハイパ-核 (K^ー,π^ー)反応 (π^+,K^+)反応 π中間子的崩壊 (π^+、K^+)反応 (K^-、π^-)反応ストレンジネス DWIA 配位混合

项目摘要

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.

所有（k^ - ，pi^ - ），（pe^+，k^+）和（γ，k^+）反应对P壳核靶标的（k^ - ，pi^ - ），（pe^+，k^+）进行了广泛的理论分析。我们使用在扩展的Cohen-Kurath型计算中获得的可靠的高核波函数。从包括自旋叶片组件在内的基本幅度开始，可以利用理论处理的第二个改进。现有的反应数据通过我们的模型成功解释了新框架。此外，我们不仅可以预测各种反应截面，还可以预测这三个反应的极化能力。这些过程的特征被阐明在将来的超核光谱学中非常有用。为较广泛的高核区域进行了系统评估的较弱的衰减率：S壳，P壳，SD壳，SD壳和典型的重型系统，直到铅区域。 Pion-Nucleus光电位的完整形式具有一致的顶点重归于。因此，我们介绍了重型高核中的PionIn衰减的标准理论估计值。对于重型系统，我们讨论了Pauli阻塞和由于质量变形而导致的恢复与质量数的函数之间的有趣相互作用。对于P壳和SD壳区域，我们强调了一个显着的壳结构依赖性，该依赖性在详细的分析中应该很有用。对于非常轻的lambda和lambda lambda-hypernuclei，在Kapur-peierls方法的框架工作中计算了三体未结合状态的连续性光谱。与现有数据的比较令人满意。