Spin observables in nucleon-deuteron scattering and three-nucleon forces
Spin observables in nucleon-deuteron scattering and three-nucleon forces
复制标题
核子-氘核散射和三核子力中的自旋可观测量
DOI：
10.1103/physrevc.66.044005
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发表时间：
2002
影响因子：
3.1
通讯作者：
Y. Iseri
中科院分区：
文献类型：
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作者：
S. Ishikawa;M. Tanifuji;Y. Iseri
三核子力是少核子体系中的一个最新研究课题，它很好地解释了质子-氘核弹性散射中的束缚能和最小散射截面，但不能解释核子和氘核的分析本领等自旋观测量，表明它们的自旋依赖性存在严重缺陷。通过将核子-氘核弹性振幅分解为自旋空间张量，研究了核子-氘核弹性振幅的自旋结构，并考察了三核子力对求解Faddeev方程得到的振幅各分量的影响.假设自旋标量振幅占主导地位的其他，我们推导出简单的表达式自旋可观的核子-氘弹性散射。这些表达式表明，散射中自旋观测量的特定组合提供了三核子力的标量、矢量或张量分量的直接信息。Faddeev计算数值研究这些影响。
Three-nucleon forces, which compose an up-to-date subject in few-nucleon systems, provide a good account of the triton binding energy and the cross section minimum in proton-deuteron elastic scattering, while do not succeed in explaining spin observables such as the nucleon and deuteron analyzing powers, suggesting serious defects in their spin dependence. We study the spin structure of nucleon-deuteron elastic amplitudes by decomposing them into spin-space tensors and examine effects of three-nucleon forces to each component of the amplitudes obtained by solving the Faddeev equation. Assuming that the spin-scalar amplitudes dominate the others, we derive simple expressions for spin observables in the nucleon-deuteron elastic scattering. The expressions suggest that a particular combination of spin observables in the scattering provides direct information of scalar, vector, or tensor component of the three-nucleon forces. These effects are numerically investigated by the Faddeev calculation.
酒井西川实验室
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