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Evolution of Shell Structure in Neutron-Rich Calcium Isotopes

Journal Article · · Physical Review Letters
 [1];  [2];  [3];  [4];  [1]
  1. University of Tennessee (UTK) and Oak Ridge National Laboratory (ORNL)
  2. NSCL, Michigan State University/ Univ. Oslo, Norway
  3. University of Oslo, Norway
  4. University of Idaho
+ Show Author Affiliations
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 =2+ states for the isotopes 42,48,50,52Ca are in good agreement with data, and we predict the excitation energy of the first J =2+ state in 54Ca at 1.9 MeV, displaying only a weak subshell closure. In the odd-mass nuclei 53,55,61Ca we find that the positive parity states deviate strongly from the naive shell model.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Oak Ridge National Laboratory (ORNL)
Sponsoring Organization:
DOE Office of Science; SC USDOE - Office of Science (SC)
DOE Contract Number:
AC05-00OR22725
OSTI ID:
1092351
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 3 Vol. 109; ISSN 0031-9007
Country of Publication:
United States
Language:
English

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