Department of Physics and Astronomy and High Performance Computing Collaboratory, Mississippi State University, Mississippi State, Mississippi 39762, USA.
Phys Rev Lett. 2011 Jun 3;106(22):222501. doi: 10.1103/PhysRevLett.106.222501. Epub 2011 May 31.
The radiative neutron capture on lithium-7 is calculated model independently using a low-energy halo effective field theory. The cross section is expressed in terms of scattering parameters directly related to the S-matrix elements. It depends on the poorly known p-wave effective range parameter r(1). This constitutes the largest uncertainty in traditional model calculations. It is explicitly demonstrated by comparing with potential model calculations. A single parameter fit describes the low-energy data extremely well and yields r(1)≈-1.47 fm(-1).
使用低能晕有效场理论独立计算了锂-7 的辐射中子俘获。截面表示为与 S 矩阵元素直接相关的散射参数。它取决于知之甚少的 p 波有效范围参数 r(1)。这是传统模型计算中最大的不确定性。通过与势模型计算的比较，明确地证明了这一点。一个单一参数拟合极好地描述了低能数据，并给出 r(1)≈-1.47 fm(-1)。
