@article{Hagen2012c,
abstract = {We employ interactions from chiral effective field theory and compute the binding energies and low-lying excitations of calcium isotopes with the coupled-cluster method. Effects of three-nucleon forces are included phenomenologically as in-medium two-nucleon interactions, and the coupling to the particle continuum is taken into account using a Berggren basis. The computed ground-state energies and the low-lying J$\pi$=2 + states for the isotopes Ca42,48,50,52 are in good agreement with data, and we predict the excitation energy of the first J$\pi$=2 + state in Ca54 at 1.9 MeV, displaying only a weak subshell closure. In the odd-mass nuclei Ca53,55,61 we find that the positive parity states deviate strongly from the naive shell model. {\textcopyright} 2012 American Physical Society.},
archivePrefix = {arXiv},
arxivId = {1204.3612},
author = {Hagen, G. and Hjorth-Jensen, M. and Jansen, G. R. and MacHleidt, R. and Papenbrock, T.},
doi = {10.1103/PhysRevLett.109.032502},
eprint = {1204.3612},
issn = {00319007},
journal = {Physical Review Letters},
number = {3},
title = {{Evolution of shell structure in neutron-rich calcium isotopes}},
volume = {109},
year = {2012}
}

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