S -matrix and R -matrix determination of the low-energy 5 He and 5 Li resonance parameters
S -matrix and R -matrix determination of the low-energy 5 He and 5 Li resonance parameters
复制标题
低能 5 He 和 5 Li 共振参数的 S 矩阵和 R 矩阵测定
DOI：
10.1103/physrevc.55.536
复制
发表时间：
1996
影响因子：
3.1
通讯作者：
G. Hale
中科院分区：
文献类型：
--
作者：
A. Csótó;G. Hale
在微观团簇模型中研究了{sup 5}He和{sup 5}Li的低能3/2{sup{负}}和1/2{sup{负}}态。分别重现了Bond({α}+n)和Schwandt({α}+p)的散射相移。我们通过定域化解析连续的S矩阵在复能量下的极点来确定共振参数。我们的结果不同于传统的R矩阵共振参数，这些参数是从实验数据中提取的，使用基于反应截面峰的位置和宽度的共振的定义。然而，它们与一种在复能量下工作的扩展R-矩阵方法的结果非常吻合。{版权所有}{ITAL 1997}{ITAL The American Physitive Society}
We study the low-energy 3/2{sup {minus}} and 1/2{sup {minus}} states of {sup 5}He and {sup 5}Li in a microscopic cluster model. The scattering phase shifts of Bond ({alpha}+n) and of Schwandt ({alpha}+p), respectively, are well reproduced. We determine the resonance parameters by localizing the poles of the analytically continued S matrix at complex energies. Our results differ from conventional R-matrix resonance parameters, that were extracted from experimental data using the definition of a resonance based on the positions and widths of reaction cross section peaks. However, they nicely agree with the results of an extended R-matrix method that works at complex energies. {copyright} {ital 1997} {ital The American Physical Society}