Department of Physics and Center of Mathematics for Applications, University of Oslo, N-0316 Oslo, Norway.
Phys Rev Lett. 2013 May 10;110(19):192502. doi: 10.1103/PhysRevLett.110.192502. Epub 2013 May 7.
We optimize the nucleon-nucleon interaction from chiral effective field theory at next-to-next-to-leading order (NNLO). The resulting new chiral force NNLO(opt) yields χ(2)≈1 per degree of freedom for laboratory energies below approximately 125 MeV. In the A=3, 4 nucleon systems, the contributions of three-nucleon forces are smaller than for previous parametrizations of chiral interactions. We use NNLO(opt) to study properties of key nuclei and neutron matter, and we demonstrate that many aspects of nuclear structure can be understood in terms of this nucleon-nucleon interaction, without explicitly invoking three-nucleon forces.
我们从次核有效场理论（next-to-next-to-leading order，NNLO）优化核子-核子相互作用。由此产生的新的手征力 NNLO(opt) 在实验室能量低于约 125 MeV 时，每自由度的 χ(2)≈1。在 A=3、4 核子系统中，三核力的贡献比以前的手征相互作用参数化小。我们使用 NNLO(opt) 研究关键核和中子物质的性质，并证明许多核结构的方面可以用这种核子-核子相互作用来理解，而不需要显式地引入三核力。
