Neutron Drip Line in Calcium Isotopes from a Chiral Interaction.

Interactions derived from effective field theories of quantum chromodynamics have thus far failed to bind calcium nuclei beyond neutron number N=40, while nuclear density functionals typically place the neutron drip line near ^{70}Ca, at N=50. We present the chiral interaction N^{3}LO_{Texas}, a combination of two- and three-nucleon potentials at fourth and third chiral order, respectively, with low-energy constants optimized using emulator-accelerated fits to few- and many-body data. This interaction accurately reproduces binding energies and charge radii of key nuclei with mass number A=3 to 208, important excited states, and nuclear matter near saturation. Using ab initio methods, coupled cluster and valence-space in-medium similarity renormalization group, we find that the calcium two-neutron drip line extends to ^{71}Ca.