Empirical deduction of a medium-modified chiral order parameter from 1s π− states in heavy nuclei
Empirical deduction of a medium-modified chiral order parameter from 1s π− states in heavy nuclei
复制标题
从重核中的 1s π− 态经验推导中等修正的手性序参数
DOI：
10.1016/s0370-2693(01)00748-1
复制
发表时间：
2001
影响因子：
4.4
通讯作者：
T. Yamazaki
中科院分区：
文献类型：
--
作者：
P. Kienle;T. Yamazaki
我们提出了一个独立于模型的方法来经验性地推导出π介子-核相互作用的等矢量强度b1，它与π介子衰变常数fπ的可能修正有关，从而也与核介质中手征序参量的可能修正有关.第一个步骤是比较两个具有不同（N-Z）/A值的核，如205 Pb和115 Sn中π−的1 s结合能。第二种更直接的方法是从观察到的1 s结合能的同位素位移（如115 Sn和123 Sn）推导出b1。
We propose a model-independent procedure to deduce empirically the isovector strength b1of the pion–nucleus interaction, which is related to possible modification of the pion-decay constant fπ, and thus of the chiral order parameter, in the nuclear medium. The first procedure is to compare the 1s binding energies of π−in two nuclei which have different (N−Z)/A values, such as205Pb and115Sn. The second, more direct way is to deduce b1from an observed isotope shift of the 1s binding energy, such as in115Sn and123Sn.