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A Guided Tour of Ab Initio Nuclear Many-Body Theory
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A Guided Tour of Ab Initio Nuclear Many-Body Theory
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Over the last decade, new developments in Similarity Renormalization Group techniques and nuclear many-body methods have dramatically increased the capabilities of ab initio nuclear structure and reaction theory. Ground and excited-state properties can be computed up to the tin region, and from the proton to the presumptive neutron drip lines, providing unprecedented opportunities to confront two- plus three-nucleon interactions from chiral Effective Field Theory with experimental data. In this contribution, I will give a broad survey of the current status of nuclear many-body approaches, and I will use selected results to discuss both achievements and open issues that need to be addressed in the coming decade.
Forward citations
Cited by 12 Pith papers
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Jacobi Coordinates on Hyper-tori and Geometric Factors in the Volume Dependencies
The finite-volume energy shift of a clustered nucleus is the point-like two-body shift multiplied by a geometric factor that counts spin-isospin cluster partitions, and this factor is essential for extracting ANCs.
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Measurement of the azimuthal anisotropy of charged particles in $\sqrt{s_{\mathrm{NN}}}=5.36$ TeV $^{16}$O$+^{16}$O and $^{20}$Ne$+^{20}$Ne collisions with the ATLAS detector
First measurements of v_n (n=2-4) in 5.36 TeV O+O and Ne+Ne collisions show enhanced v2 in central neon collisions consistent with prolate nuclear deformation.
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Medium-mass nuclei with neural quantum states
Pfaffian-Jastrow neural quantum states yield ground-state energies and charge radii for nuclei up to A=58, with weak p-wave terms reducing average energy error to ~3% while revealing Hamiltonian sensitivity and A^3 scaling.
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Constructing Effective Interactions via Projection-Based Inversion
Discrete energy levels from truncated many-body calculations are inverted, via a Multiparameter Eigenvalue Problem emulator, into effective contact interactions that yield scattering phase shifts and resonance predictions.
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Ab initio correlations between neutrinoless and two-neutrino double-beta decays in $^{48}$Ca
Ab initio IM-NCCI calculations on 48Ca establish strong linear correlations between 0νββ and 2νββ NMEs across 34 chiral Hamiltonians, yielding a constrained M^{0ν} prediction of 1.30-1.65 after incorporating experimen...
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Ab initio correlations between neutrinoless and two-neutrino double-beta decays in $^{48}$Ca
Ab initio IM-NCCI calculations on 48Ca establish linear correlations between 0νββ and 2νββ NMEs from 34 chiral Hamiltonians, constraining M^{0ν} to 1.30-1.65 using experimental 2ν data after applying a fitted quenchin...
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Light antiproton-nucleus systems at low energies with the ab initio NCSM/RGM method
Antiproton-deuteron, antiproton-triton, and antiproton-helium-3 scattering and antiprotonic-atom observables were computed with an adapted ab initio NCSM/RGM method, showing peripheral annihilation at about 2 fm.
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Measurement of the azimuthal anisotropy of charged particles in $\sqrt{s_{\mathrm{NN}}}=5.36$ TeV $^{16}$O$+^{16}$O and $^{20}$Ne$+^{20}$Ne collisions with the ATLAS detector
ATLAS presents first v_n (n=2-4) measurements in O+O and Ne+Ne collisions, showing a flow hierarchy and a central Ne+Ne v2 enhancement consistent with prolate neon deformation.
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Perturbative calculations of light nuclei up to N$^3$LO in chiral effective field theory
Perturbative N3LO calculations in chiral EFT with RG-guided power counting yield robust predictions for light nuclei energies when calibrated on the tritium binding energy.
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Benchmarking projected generator coordinate method for nuclear Gamow-Teller transitions
A minimal extension of the quantum-number projected generator coordinate method is benchmarked against exact solutions for Gamow-Teller transitions in Ca and Ti isotopes and the 2νββ decay of 48Ca.
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Scrutiny of the new class of three-nucleon forces
After removing renormalization-scheme-dependent short-distance parts, the scrutinized three-nucleon forces yield small contributions to neutron and symmetric nuclear matter equations of state, aligning with standard c...
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Future directions in nuclear $\beta$ decay at FRIB and beyond
A community white paper summarizing the current state and future directions of nuclear beta-decay studies at FRIB, with no new quantitative result.
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