47 citations · 244 across the 28 of their papers we have counts for
26 papers · 1 filter
Electron scattering and the distribution of electric charge and magnetization inside nuclei
Alex Gnech, Lorenzo Andreoli, Graham Chambers-Wall +2
How are the electric and magnetic distributions carried by protons and neutrons arranged inside an atomic nucleus? One of the most reliable ways to answer this question is to scatt…
Quantum Monte Carlo calculations of Zemach moments in nuclei
Garrett B. King, Sonia Bacca, Graham Chambers-Wall +4
Modern atomic spectroscopy has reached a level of precision at which nuclear-structure effects can no longer be neglected and must be quantified reliably. In particular, hyperfine…
A new analysis of the "hep" S-factor and the "hen" cross section
Michele Viviani, Alex Gnech, Laura Elisa Marcucci +2
We present a new accurate analysis of the HeHe (''hep'') reaction at astrophysical energies. The S-factor is computed using a state-of-the-art method to calcu…
Bayesian analysis of proton-proton fusion in chiral effective field theory
Vittorio Barlucchi, Alex Gnech, Scilla Degl'Innocenti +1
The astrophysical -factor for the proton-proton fusion is calculated in the low-energy regime for a variety of nuclear interactions and consistent nuclear currents, derived with…
Emulation of Proton-Deuteron Scattering via the Reduced Basis Method and Active Learning: Detailed Description
Alex Gnech, Xilin Zhang, Christian Drischler +5
Nucleon-deuteron () scattering can be used to constrain three-nucleon forces in chiral effective field theory (EFT). However, high-fidelity calculations, such as the Hypersp…
Accurate and Efficient Emulation of Proton-Deuteron Scattering via the Reduced Basis Method and Active Learning
Alex Gnech, Xilin Zhang, Christian Drischler +5
We introduce highly accurate and efficient emulators for proton-deuteron scattering below the deuteron breakup threshold. We explore two different reduced-basis method strategies:…
Relativistic corrections for lepton-nucleus scattering in the short-time approximation
Lorenzo Andreoli, Ronen Weiss, Graham Chambers-Wall +4
We present an approach for including relativistic corrections in lepton-nucleus scattering calculations within the Short-Time Approximation (STA). Previous ab-initio studies employ…
A renormalizable theory for not-so-light nuclei
L. Contessi, M. Schäfer, A. Gnech +2
We present an improved action for Pionless Effective Field Theory (EFT). Previous formulations of renormalizable nuclear EFTs have encountered instabilities in systems with more th…
Electromagnetic radii of light nuclei from variational Monte Carlo calculations
G. B. King, G. Chambers-Wall, A. Gnech +3
We present variational Monte Carlo calculations of charge and magnetic radii in nuclei. The calculations are based on the Norfolk two- and three-nucleon interactions, an…
Longitudinal form factors of nuclei in a chiral effective field theory approach
G. B. King, G. Chambers-Wall, A. Gnech +3
In this work, we present the elastic electron scattering longitudinal form factors of nuclei computed in a variational Monte Carlo approach. We employ the Norfolk family…
Magnetic structure of nuclei using the Norfolk nuclear models with quantum Monte Carlo methods
G. Chambers-Wall, A. Gnech, G. B. King +4
We present Quantum Monte Carlo calculations of magnetic moments, form factors, and densities of nuclei within a chiral effective field theory approach. We use the Norfolk…
Quantum Monte Carlo calculations of magnetic form factors in light nuclei
G. Chambers-Wall, A. Gnech, G. B. King +4
We present Quantum Monte Carlo calculations of magnetic form factors in nuclei, based on Norfolk two- and three-nucleon interactions, and associated one- and two-body elec…
Static and dynamic properties of atomic nuclei with high-resolution potentials
Alex Gnech, Alessandro Lovato, Noemi Rocco
We compute ground-state and dynamical properties of He and O nuclei using as input high-resolution, phenomenological nucleon-nucleon and three-nucleon forces that are lo…
Distilling the essential elements of nuclear binding via neural-network quantum states
A. Gnech, B. Fore, A. Lovato
In pursuing the essential elements of nuclear binding, we compute ground-state properties of atomic nuclei with up to nucleons, using as input a leading order pionless effec…
Bayesian analysis of muon capture on deuteron in chiral effective field theory
Alex Gnech, Laura Elisa Marcucci, Michele Viviani
We compute the muon capture on deuteron in the doublet hyperfine state for a variety of nuclear interactions and consistent nuclear currents. Our analysis includes a detailed exami…
Perspectives on few-body cluster structures in exotic nuclei
D. Bazin, K. Becker, F. Bonaiti +16
It is a fascinating phenomenon in nuclear physics that states with a pronounced few-body structure can emerge from the complex dynamics of many nucleons. Such halo or cluster state…
Muon capture on deuteron using local chiral potentials
L. Ceccarelli, A. Gnech, L. E. Marcucci +2
The muon capture reaction in the doublet hyperfine state is studied using nuclear potentials and consistent currents derived in chiral effective f…
Magnetic structure of few-nucleon systems at high momentum transfers in a EFT approach
Alex Gnech, Rocco Schiavilla
The five low-energy constants (LECs) in the electromagnetic current derived in chiral effective field theory (EFT) up to one loop are determined by a simultaneous fit to the $A\…
Nuclei with up to nucleons with artificial neural network wave functions
Alex Gnech, Corey Adams, Nicholas Brawand +3
The ground-breaking works of Weinberg have opened the way to calculations of atomic nuclei that are based on systematically improvable Hamiltonians. Solving the associated many-bod…
Comparative study of He -decay based on different similarity-renormalization-group evolved chiral interactions
A. Gnech, L. E. Marcucci, R. Schiavilla +1
We report on a study of the Gamow-Teller matrix element contributing to He -decay with similarity renormalization group (SRG) versions of momentum- and configuration-space…
Two- and three-nucleon contact interactions and ground-state energies of light- and medium-mass nuclei
R. Schiavilla, L. Girlanda, A. Gnech +5
Classes of two-nucleon () contact interactions are developed in configuration space at leading order (LO), next-to-leading order (NLO), and next-to-next-to-next-to-leading orde…
Theoretical calculation of nuclear reactions of interest for Big Bang Nucleosynthesis
Alex Gnech
Standard Big Bang Nucleosynthesis (BBN) predicts the abundances of the light elements in the early universe. Even if the overall agreement with the experimental data is good, still…
Calculation of the Li ground state within the hyperspherical harmonic basis
Alex Gnech, Michele Viviani, Laura Elisa Marcucci
We have studied the solution of the six-nucleon bound state problem using the hyperspherical harmonic (HH) approach. For this study we have considered only two-body nuclear forces.…
Parity- and time-reversal-violating nuclear forces
J. de Vries, E. Epelbaum, L. Girlanda +3
Parity-violating and time-reversal conserving (PVTC) and parity-violating and time-reversal-violating (PVTV) forces in nuclei form only a tiny component of the total interaction be…