Optimization of Chiral Forces
- Andreas Ekstrom, MSU NSCL/Oslo University, Norway
Tuesday, April 2, 11:00 AM - Theory Seminar
NSCL Seminar Room
Chiral effective field theory offers a controlled and systematic expansion of the nuclear force. The dynamics depend on a set of low energy constants (LECs) that can be determined from experimental nucleon-nucleon scattering data. We have recently employed a mathematical optimization algorithm called POUNDerS in order to optimize the chiral force parameters. At next-to-next-to-leading order (NNLO), the resulting chi2/datum with respect to experimental two-nucleon scattering data is reduced with almost an order of magnitude compared to previous efforts. In addition to presenting the details of our current and future optimization efforts, I will present some results from ab initio and shell-model calculations in light- and medium-mass isotopes using the POUNDerS-optimized NNLO interaction. It is interesting to see that we obtain the leading-order nuclear physics using a leading-order force. This shows that there is room to systematically improve the presently available chiral interactions.