Ab initio multishell valence-space Hamiltonians and the island of inversion

Miyagi, T.; Stroberg, S. R.; Holt, J. D.; Shimizu, N.

doi:10.1103/physrevc.102.034320

Ab initio multishell valence-space Hamiltonians and the island of inversion

Journal Article · Wed Sep 16 00:00:00 EDT 2020 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.102.034320· OSTI ID:1800934

^[1]; ^[2]; Holt, J. D. ^[3]; Shimizu, N. ^[4]

TRIUMF, Vancouver, BC (Canada); OSTI
Univ. of Washington, Seattle, WA (United States)
TRIUMF, Vancouver, BC (Canada); McGill Univ., Montreal, QC (Canada)
Univ. of Tokyo (Japan)

In the shell-model framework, valence-space Hamiltonians connecting multiple major-oscillator shells are of key interest for investigating the physics of neutron-rich nuclei, which have been the subject of intense experimental activity for decades. Here we present an extension of the ab initio valence-space in-medium similarity renormalization group, which allows the derivation of such Hamiltonians nonperturbatively. Starting from initial two- and three-nucleon forces from chiral effective field theory, we then calculate properties of nuclei in the important island-of-inversion region above oxygen, so far unexplored with ab initio methods. In this work, our results in the neon and magnesium isotopes indicate the importance of neutron excitation from the $$\textit{sd}$$ to $$\textit{pf}$$ shells and ground states dominated by intruder configurations around $$\textit{N}$$ = 20, consistent with the conclusions from phenomenological studies. We also benchmark the excitation spectrum of ¹⁶O with coupled-cluster theory, finding generally good agreement, and discuss implications for ground-state energies and charge radii in oxygen and calcium isotopes. Finally we outline the proper procedure for treating the longstanding issue of center-of-mass contamination, and show that with a particular choice of valence space, these spurious states can be removed successfully.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Washington, Seattle, WA (United States)

Sponsoring Organization:: Arthur B. McDonald Canadian Astroparticle Physics Research Institute; Natural Sciences and Engineering Research Council of Canada (NSERC); USDOE Office of Science (SC)

Grant/Contract Number:: FG02-97ER41014

OSTI ID:: 1800934

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 3 Vol. 102; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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