Lattice Effective Field Theory for Medium-Mass Nuclei
Abstract
We extend Nuclear Lattice Effective Field Theory (NLEFT) to medium-mass nuclei, and present results for the ground states of alpha nuclei from He to Si, calculated up to next-to-next-to-leading order (NNLO) in the EFT expansion. This computational advance is made possible by extrapolations of lattice data using multiple initial and final states. For our soft two-nucleon interaction, we find that the overall contribution from multi-nucleon forces must change sign from attractive to repulsive with increasing nucleon number. This effect is not produced by three-nucleon forces at NNLO, but it can be approximated by an effective four-nucleon interaction. We discuss the convergence of the EFT expansion and the broad significance of our findings for future ab initio calculations.
Cite
@article{arxiv.1311.0477,
title = {Lattice Effective Field Theory for Medium-Mass Nuclei},
author = {Timo A. Lähde and Evgeny Epelbaum and Hermann Krebs and Dean Lee and Ulf-G. Meißner and Gautam Rupak},
journal= {arXiv preprint arXiv:1311.0477},
year = {2014}
}
Comments
10 pages, 3 figures, 1 table, to appear in Physics Letters B