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

Eskendr Gebrerufael, Klaus Vobig, Heiko Hergert, Robert Roth

Research output: Contribution to journalArticle

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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.

LanguageEnglish (US)
Article number152503
JournalPhysical Review Letters
Volume118
Issue number15
DOIs
StatePublished - Apr 12 2017

Profile

nuclei
nuclear structure
decoupling
excitation
eigenvectors
costs
ground state
carbon
oxygen
spectroscopy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Ab Initio Description of Open-Shell Nuclei : Merging No-Core Shell Model and In-Medium Similarity Renormalization Group. / Gebrerufael, Eskendr; Vobig, Klaus; Hergert, Heiko; Roth, Robert.

In: Physical Review Letters, Vol. 118, No. 15, 152503, 12.04.2017.

Research output: Contribution to journalArticle

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