Ab Initio Computation of the Longitudinal Response Function in Ca 40

J. E. Sobczyk; B. Acharya; S. Bacca; G. Hagen

doi:10.1103/PhysRevLett.127.072501

Ab Initio Computation of the Longitudinal Response Function in Ca 40

J. E. Sobczyk, B. Acharya, S. Bacca, G. Hagen

Theoretical and Computational Physics

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20 Scopus citations

Abstract

We present a consistent ab initio computation of the longitudinal response function RL in Ca40 using the coupled-cluster and Lorentz integral transform methods starting from chiral nucleon-nucleon and three-nucleon interactions. We validate our approach by comparing our results for RL in He4 and the Coulomb sum rule in Ca40 against experimental data and other calculations. For RL in Ca40 we obtain a very good agreement with experiment in the quasielastic peak up to intermediate momentum transfers, and we find that final state interactions are essential for an accurate description of the data. This work presents a milestone towards ab initio computations of neutrino-nucleus cross sections relevant for experimental long-baseline neutrino programs.

Original language	English
Article number	072501
Journal	Physical Review Letters
Volume	127
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevLett.127.072501
State	Published - Aug 13 2021

Funding

We thank Nir Barnea and Thomas Papenbrock for useful comments and discussions. This work was supported by the Deutsche Forschungsgemeinschaft (DFG) through the Collaborative Research Center [The Low-Energy Frontier of the Standard Model (SFB 1044)], and through the Cluster of Excellence “Precision Physics, Fundamental Interactions, and Structure of Matter” (PRISMA EXC 2118/1) funded by the DFG within the German Excellence Strategy (Project ID 39083149), by the Office of Nuclear Physics, U.S. Department of Energy, under Grants No. desc0018223 (NUCLEI SciDAC-4 collaboration) and by the Field Work Proposal ERKBP72 at Oak Ridge National Laboratory (ORNL). Computer time was provided by the Innovative and Novel Computational Impact on Theory and Experiment (INCITE) program and by the supercomputer Mogon at Johannes Gutenberg-Universität Mainz. This research used resources of the Oak Ridge Leadership Computing Facility located at ORNL, which is supported by the Office of Science of the Department of Energy under Contract No. DE-AC05-00OR22725. +

Funders	Funder number
Office of Science of the Department of Energy	DE-AC05-00OR22725
U.S. Department of Energy	desc0018223
Nuclear Physics
Oak Ridge National Laboratory
Deutsche Forschungsgemeinschaft	39083149, EXC 2118/1, SFB 1044

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10.1103/PhysRevLett.127.072501

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abstract = "We present a consistent ab initio computation of the longitudinal response function RL in Ca40 using the coupled-cluster and Lorentz integral transform methods starting from chiral nucleon-nucleon and three-nucleon interactions. We validate our approach by comparing our results for RL in He4 and the Coulomb sum rule in Ca40 against experimental data and other calculations. For RL in Ca40 we obtain a very good agreement with experiment in the quasielastic peak up to intermediate momentum transfers, and we find that final state interactions are essential for an accurate description of the data. This work presents a milestone towards ab initio computations of neutrino-nucleus cross sections relevant for experimental long-baseline neutrino programs.",

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AB - We present a consistent ab initio computation of the longitudinal response function RL in Ca40 using the coupled-cluster and Lorentz integral transform methods starting from chiral nucleon-nucleon and three-nucleon interactions. We validate our approach by comparing our results for RL in He4 and the Coulomb sum rule in Ca40 against experimental data and other calculations. For RL in Ca40 we obtain a very good agreement with experiment in the quasielastic peak up to intermediate momentum transfers, and we find that final state interactions are essential for an accurate description of the data. This work presents a milestone towards ab initio computations of neutrino-nucleus cross sections relevant for experimental long-baseline neutrino programs.

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Ab Initio Computation of the Longitudinal Response Function in Ca 40

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