Based on the realistic nuclear force of the high-precision CD-Bonn potential, we have performed comprehensive calculations for neutron-rich calcium isotopes using the Gamow shell model (GSM) which includes resonance and continuum. The realistic GSM calculations produce well binding energies, one- and two-neutron separation energies, predicting that ${}^{57}\mathrm{Ca}$ is the heaviest bound odd isotope and ${}^{70}\mathrm{Ca}$ is the dripline nucleus. Resonant states are predicted, which provides useful information for future experiments on particle emissions in neutron-rich calcium isotopes. Shell evolutions in the calcium chain around neutron numbers $N=32$, 34, and 40 are understood by calculating effective single-particle energies, the excitation energies of the first $2^{+}$ states and two-neutron separation energies. The calculations support shell closures at ${}^{52}\mathrm{Ca}$ ($N=32$) and ${}^{54}\mathrm{Ca}$ ($N=34$) but show a weakening of shell closure at ${}^{60}\mathrm{Ca}$ ($N=40$). The possible shell closure at ${}^{70}\mathrm{Ca}$ ($N=50$) is predicted.

• Received 30 May 2020
• Accepted 17 August 2020

DOI:https://doi.org/10.1103/PhysRevC.102.034302