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2012

Evolution of shell structure in neutron-rich calcium isotopes

Hagen, G., Hjorth-Jensen, M., Jansen, G. R. et al.

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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 2+ states for the isotopes 42,48,50,52Ca are in good agreement with data, and we predict the excitation energy of the first 2+ state in 54Ca at 1.9 MeV, displaying only a weak sub-shell closure.
In the odd-mass nuclei 53,55,61Ca we find that the positive parity states deviate strongly from the naive shell model.

Evolution of shell structure in neutron-rich calcium isotopes · Around

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