Lattice Calculation of the Sn Isotopes near the Proton Dripline

We present the first ab initio lattice calculations of the proton-rich tin isotopes Sn⁹⁹ to Sn¹⁰² using nuclear lattice effective field theory with high-fidelity two- and three-nucleon forces. For a given set of three-nucleon couplings, we reproduce binding energies with ∼1% accuracy for the even–even systems and obtain energy splitting and two-nucleon separation energies in agreement with experiment. Our results confirm the N=50 shell closure and reveal that the binding energy of Sn⁹⁹ lies below values extrapolated from heavier isotopes.