We calculate the neutron-${}^{60}\mathrm{Ca}$ $S$-wave scattering phase shifts using state of the art coupled-cluster theory combined with modern ab initio interactions derived from chiral effective theory. Effects of three-nucleon forces are included schematically as density dependent nucleon-nucleon interactions. This information is combined with halo effective field theory in order to investigate the ${}^{60}\mathrm{Ca}$-neutron-neutron system. We predict correlations between different three-body observables and the two-neutron separation energy of ${}^{62}\mathrm{Ca}$. This provides evidence of Efimov physics along the calcium isotope chain. Experimental key observables that facilitate a test of our findings are discussed.

• Received 18 June 2013

DOI:https://doi.org/10.1103/PhysRevLett.111.132501