Ab Initio Description of Open-Shell Nuclei: Merging No-Core Shell Model and In-Medium Similarity Renormalization Group

Eskendr Gebrerufael, Klaus Vobig, Heiko Hergert, and Robert Roth
Phys. Rev. Lett. 118, 152503 – Published 12 April 2017

Abstract

We merge two successful ab initio nuclear-structure methods, the no-core shell model (NCSM) and the multireference in-medium similarity renormalization group (IM-SRG) to define a new many-body approach for the comprehensive description of ground and excited states of closed and open-shell nuclei. Building on the key advantages of the two methods—the decoupling of excitations at the many-body level in the IM-SRG and the access to arbitrary nuclei, eigenstates, and observables in the NCSM—their combination enables fully converged no-core calculations for an unprecedented range of nuclei and observables at moderate computational cost. We present applications in the carbon and oxygen isotopic chains, where conventional NCSM calculations are still feasible and provide an important benchmark. The efficiency and rapid convergence of the new approach make it ideally suited for ab initio studies of the complete spectroscopy of nuclei up into the medium-mass regime.

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  • Received 21 October 2016

DOI:https://doi.org/10.1103/PhysRevLett.118.152503

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Eskendr Gebrerufael1,*, Klaus Vobig1, Heiko Hergert2, and Robert Roth1

  • 1Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstr. 2, 64289 Darmstadt, Germany
  • 2NSCL/FRIB Laboratory and Department of Physics & Astronomy, Michigan State University, East Lansing, Michigan 48824-1321, USA

  • *eskendr.gebrerufael@physik.tu-darmstadt.de

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Vol. 118, Iss. 15 — 14 April 2017

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