标题： 由准弹性（\vec{p}，\vec{n}）反应研究的介子模式 显示英文标题

标题： Pionic Modes Studied by Quasielastic (\vec{p}, \vec{n}) Reactions

摘要： 人们长期以来预计，介子模式在高密度核物质中会表现出一些集体现象，如介子凝聚及其在普通原子核中的前兆现象。 在这里，我们展示了在T_p = 346和494MeV时，动量转移q = 1.7fm-1的准弹性12C、40Ca（\vec{p}，\vec{n}）反应中的各向同性自旋纵向截面ID_q中观察到的前兆现象的证据。 本报告的另一个目的是从上述反应中评估大动量区域的Landau-Migdal参数g'_{神经网络}，g'_{N\Delta }和g'_{\Delta \Delta }。 我们得到了 g'_{神经网络} \approx 0.6-0.7，g'_{N\Delta } \approx 0.3-0.4。 结果与小动量区域的结果一致，这些结果来自于伽莫夫-泰勒强度分布。 显示英文摘要

摘要： It has long been expected that the pionic modes show some collective phenomena such as the pion condensation in the high density nuclear matter and its precursor phenomena in the ordinary nuclei. Here we show an evidence of the precursor observed in the isovector spin longitudinal cross sections ID_q of the quasielastic 12C, 40Ca (\vec{p}, \vec{n}) reactions at T_p = 346 and 494MeV with the momentum transfer q = 1.7fm-1. Another aim of this report is to evaluate the Landau-Migdal parameters g'_{NN}, g'_{N\Delta} and g'_{\Delta\Delta} at the large momentum region from the above reactions. We obtained g'_{NN} \approx 0.6-0.7, g'_{N\Delta} \approx 0.3-0.4. The results are consistent with those at the small momentum region, which are obtained from the Gamov-Teller strength distribution.