Ab initio calculations of beta-decay half-lives for $N=50$ neutron-rich nuclei

Abstract

Beta-decay rates of extreme neutron-rich nuclei remain largely unknown experimentally, while they are critical inputs for $r$-process nucleosynthesis. We present first ab initio calculations of total beta-decay half-lives, with a focus on $N=50$ nuclei. Starting from nuclear forces and currents based on chiral effective field theory, we use the in-medium similarity renormalization group to consistently derive valence-space Hamiltonians and weak operators, from which we calculate the nuclear states involved and the Gamow-Teller transition strengths, without phenomenological adjustments. In addition, we explore effects of first-forbidden contributions. Our results show that the inclusion of two-body currents increases the total half-lives, which then show good agreement with the existing experimental data, thereby validating the predictive capability of our approach.

arXiv comment7 pages, 5 figures

References in corpus (45)

• Modern Theory of Nuclear Forces
• Chiral effective field theory and nuclear forces
• The Shell Model as Unified View of Nuclear Structure
• Origin of the Heaviest Elements: the Rapid Neutron-Capture Process
• Improved nuclear matter calculations from chiral low-momentum interactions
• The impact of individual nuclear properties on $r$-process nucleosynthesis
• The In-Medium Similarity Renormalization Group: A Novel Ab Initio Method for Nuclei
• Thick-Restart Block Lanczos Method for Large-Scale Shell-Model Calculations
• Discrepancy between experimental and theoretical $\beta$-decay rates resolved from first principles
• Large scale evaluation of beta-decay rates of r-process nuclei with the inclusion of first-forbidden transitions
• A nucleus-dependent valence-space approach to nuclear structure
• A Guided Tour of Ab Initio Nuclear Many-Body Theory
• In-Medium Similarity Renormalization Group for Nuclei
• Three-Nucleon Low-Energy Constants from the Consistency of Interactions and Currents in Chiral Effective Field Theory
• Non-Empirical Interactions for the Nuclear Shell Model: An Update
• Beta decay of r-process waiting-point nuclei in a self-consistent approach
• Ab initio limits of atomic nuclei
• Current Status of r-Process Nucleosynthesis
• Chiral two-body currents in nuclei: Gamow-Teller transitions and neutrinoless double-beta decay
• Parameter-free effective field theory calculation for the solar proton-fusion and hep processes
• ${}^{78}$Ni revealed as a doubly magic stronghold against nuclear deformation
• In-Medium Similarity Renormalization Group for Open-Shell Nuclei
• Accurate bulk properties of nuclei from $A=2$ to $\infty$ from potentials with $\Delta$ isobars
• Half Life of the Doubly-magic r-Process Nucleus 78Ni
• Coherent elastic neutrino-nucleus scattering: EFT analysis and nuclear responses
• The Magnus expansion and the in-medium similarity renormalization group
• Structure of ${}^{78}$Ni from first principles computations
• Three-Nucleon Forces: Implementation and Applications to Atomic Nuclei and Dense Matter
• Beta Decays of Isotones with Neutron Magic Number of N=126 and R-process Nucleosynthesis
• Converged ab initio calculations of heavy nuclei
• Shell-model half-lives for the N=82 nuclei and their implications for the r-process
• Global description of beta-minus decay in even-even nuclei with the axially-deformed Skyrme finite amplitude method
• Ab initio multi-shell valence-space Hamiltonians and the island of inversion
• Global Description of Beta Decay with the Axially-Deformed Skyrme Finite Amplitude Method: Extension to Odd-Mass and Odd-Odd Nuclei
• Half-lives and branchings for β-delayed neutron emission for neutron-rich Co-Cu isotopes in the r-process
• Nuclear axial current operators to fourth order in chiral effective field theory
• Local chiral interactions, the tritium Gamow-Teller matrix element, and the three-nucleon contact term
• Calculation of beta-decay rates in a relativistic model with momentum-dependent self-energies
• Combining the in-medium similarity renormalization group with the density matrix renormalization group: Shell structure and information entropy
• \texttt{NuHamil}: A numerical code to generate nuclear two- and three-body matrix elements from chiral effective field theory
• Shell model half-lives for r-process N=82 nuclei
• The Piecewise Moments Method: A Generalized Lanczos Technique for Nuclear Response Surfaces
• Improved structure of calcium isotopes from ab initio calculations
• Uncertainties in constraining low-energy constants from ${}^3$H $\beta$ decay
• Competition between allowed and first-forbidden $\beta$ decay in $r$-process waiting-point nuclei within a relativistic beyond-mean-field approach

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