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Title: Improved structure of calcium isotopes from ab initio calculations

Journal Article · · Physical Review. C
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [4]
  1. Technische Universität Darmstadt (Germany); ExtreMe Matter Institute EMMI Darmstadt (Germany); Max-Planck-Institut für Kernphysik Heidelberg (Germany); Oak Ridge Leadership Computing Facility, Oak Ridge, TN (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  2. University of Tsukuba (Japan); Technische Universität Darmstadt (Germany); ExtreMe Matter Institute EMMI Darmstadt (Germany); Max-Planck-Institut für Kernphysik Heidelberg (Germany)
  3. University of Notre Dame, IN (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
  4. Technische Universität Darmstadt (Germany); ExtreMe Matter Institute EMMI Darmstadt (Germany); Max-Planck-Institut für Kernphysik Heidelberg (Germany)

The in-medium similarity renormalization group (IMSRG) is a powerful and flexible many-body method to compute the structure of nuclei starting from nuclear forces. Recent developments have extended the IMSRG from its standard truncation at the normal-ordered two-body level, the IMSRG(2), to a precision approximation including normal-ordered three-body operators, the IMSRG(3)-N7. This improvement provides a more precise solution to the many-body problem and makes it possible to quantify many-body uncertainties in IMSRG calculations. We explore the structure of 44,48,52Ca using the IMSRG(3)-N7, focusing on understanding existing discrepancies of the IMSRG(2) to experimental results. We find a significantly better description of the first 2+ excitation energy of 48Ca, improving the description of the shell closure at N=28. At the same time, we find that the IMSRG(3)-N7 corrections to charge radii do not resolve the systematic underprediction of the puzzling large charge radius difference between 52Ca and 48Ca. We present estimates of many-body uncertainties of IMSRG(2) calculations applicable also to other systems based on the size extensivity of the method.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
Deutsche Forschungsgemeinschaft (DFG); European Union's Horizon 2020 research and innovation programme; JST ERATO; U.S. National Science Foundation; USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC); USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2529507
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 3 Vol. 111; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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