Angular-momentum projection in coupled-cluster theory: structure of <sup>34</sup>Mg

ORAL

Abstract

Single-reference coupled-cluster theory is an accurate and affordable computational method for the nuclear many-body problem. For open-shell nuclei, the reference state typically breaks rotational invariance and angular momentum must be restored as a good quantum number. We employ the disentangled coupled-cluster formalism and a Hermitian approach for the angular momentum projection.  Our results agree with benchmarks and data for 8Be and 20Ne using a two-nucleon interaction from chiral effective field theory and for pf-shell nuclei within a traditional shell model. We predict the rotational band in the exotic nucleus 34Mg.

*This work was supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Award Nos. DE-FG02-96ER40963 and DE-SC0018223, by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) -- Projektnummer 279384907 -- SFB 1245, and by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant Agreement No.~101020842). Computer time was provided by the Innovative and Novel Computational Impact on Theory and Experiment (INCITE) programme. This research used resources of the Oak Ridge Leadership Computing Facility located at Oak Ridge National Laboratory, which is supported by the Office of Science of the Department of Energy under contract No. DE-AC05-00OR22725.

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Presenters

  • Thomas Papenbrock

    • University of Tennessee

Authors

  • Thomas Papenbrock

    • University of Tennessee

  • Gaute Hagen

    • Oak Ridge National Lab

  • Sam Novario

    • Los Alamos National Laboratory

  • Zhonghao Sun

    • Oak Ridge National Lab
    • Oak Ridge National Laboratory

  • Justin G Lietz

    • Oak Ridge National Lab

  • Gustav R Jansen

    • Oak Ridge National Lab

  • Thomas Duguet

    • IRFU, CEA, Universite Paris-Saclay

  • Alexander Tichai

    • TU Darmstadt