Saturation with chiral interactions and consequences for finite nuclei
TLDR
In this article, the authors explore the impact of nuclear matter saturation on the properties and systematics of finite nuclei across the nuclear chart using the ab initio in-medium similarity renormalization group (IM-SRG).Abstract:
We explore the impact of nuclear matter saturation on the properties and systematics of finite nuclei across the nuclear chart. By using the ab initio in-medium similarity renormalization group (IM-SRG), we study ground-state energies and charge radii of closed-shell nuclei from $^{4}\mathrm{He}$ to $^{78}\mathrm{Ni}$ based on a set of low-resolution two- and three-nucleon interactions that predict realistic saturation properties. We first investigate in detail the convergence properties of these Hamiltonians with respect to model-space truncations for both two- and three-body interactions. We find one particular interaction that reproduces well the ground-state energies of all closed-shell nuclei studied. As expected from their saturation points relative to this interaction, the other Hamiltonians underbind nuclei but lead to a remarkably similar systematics of ground-state energies. Extending our calculations to complete isotopic chains in the $sd$ and $pf$ shells with the valence-space IM-SRG, the same interaction reproduces not only experimental ground states but two-neutron-separation energies and first-excited ${2}^{+}$ states. We also extend the valence-space IM-SRG to calculate radii. Since this particular interaction saturates at too high density, charge radii are still too small compared with experiment. Except for this underprediction, the radius systematics is, however, well reproduced. Our results highlight the renewed importance of nuclear matter as a theoretical benchmark for the development of next-generation chiral interactions.read more
Citations
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High-quality two-nucleon potentials up to fifth order of the chiral expansion
TL;DR: In this article, the same power counting scheme as well as the same cutoff procedures are applied in all orders of chiral effective field theory and the long-range parts of these potentials are fixed by the very accurate low-energy constants (LECs) as determined in the Roy-Steiner equations analysis.
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Discrepancy between experimental and theoretical β-decay rates resolved from first principles
P. Gysbers,P. Gysbers,Gaute Hagen,Gaute Hagen,Jason D. Holt,Gustav R. Jansen,Gustav R. Jansen,T. D. Morris,T. D. Morris,Petr Navrátil,Thomas Papenbrock,Thomas Papenbrock,Sofia Quaglioni,Achim Schwenk,Achim Schwenk,S. R. Stroberg,S. R. Stroberg,S. R. Stroberg,Kyle Wendt +18 more
TL;DR: In this paper, the authors show that the difference between the β-decay rate predicted for free neutrons and that measured in real nuclei is explained by strong correlations and the weak-force coupling between nucleons.
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Chiral interactions up to next-to-next-to-next-to-leading order and nuclear saturation
TL;DR: An efficient Monte Carlo framework for perturbative calculations of infinite nuclear matter based on chiral two-, three-, and four-nucleon interactions is presented, demonstrating a very good many-body convergence up to fourth order and exploring new chiral interactions up to N^{3}LO.
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Structure of the Lightest Tin Isotopes
T. D. Morris,J. Simonis,S. R. Stroberg,Christina Stumpf,Gaute Hagen,Jason D. Holt,Gustav R. Jansen,Thomas Papenbrock,Robert Roth,Achim Schwenk,Achim Schwenk +10 more
TL;DR: The results indicate that ^{100}Sn is doubly magic, and the quadrupole collectivity is predicted, and precise computations of ^{101}Sn based on three-particle-two-hole excitations are presented.
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