Ab initio study of the photoabsorption of 4He
Ab initio study of the photoabsorption of 4He
复制标题
4He 光吸收的从头算研究
DOI：
10.1103/physrevc.85.054002
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
K.Arai
中科院分区：
文献类型：
--
作者：
W.Horiuchi;Y.Suzuki;K.Arai
低能数据在He的光吸收截面上存在一定的差异。我们用真实的核力和显式关联的高斯函数来计算截面。考虑了末态相互作用以及二体和三体衰变通道。计算截面的方法有两种：一种是用复数标度法得到直到一个π介子剩余能量的总吸收截面，另一种是用微观矩阵法计算40 MeV以下He和He的总吸收截面。这两种方法得出的结果几乎是一样的。截面从阈值急剧上升，在26-27 MeV处达到一个巨大的共振峰。我们的计算重现了几乎所有30 MeV以上的数据。我们强调了截面上团簇组态的重要性，以及1-pion交换势对光核和规则的影响。
There are some discrepancies in the low-energy data on the photoabsorption cross section ofHe. We calculate the cross section with realistic nuclear forces and explicitly correlated Gaussian functions. Final-state interactions and two- and three-body decay channels are taken into account. The cross section is evaluated using two methods: With the complex scaling method the total absorption cross section is obtained up to the rest energy of a pion, and with the microscopic-matrix method cross sections for bothHe()H andHe()He are calculated below 40 MeV. Both methods give virtually the same result. The cross section rises sharply from thethreshold, reaching a giant resonance peak at 26–27 MeV. Our calculation reproduces almost all the data above 30 MeV. We stress the importance ofandcluster configurations on the cross section as well as the effect of the one-pion exchange potential on the photonuclear sum rule.