Abstract
We present calculations of the Ca40 transverse response function obtained from coupled-cluster theory used in conjunction with the Lorentz integral transform method. We employ nuclear forces derived at next-to-next-to leading order in chiral effective field theory with and without Δ degrees of freedom. We first benchmark this approach on the He4 nucleus and compare both the transverse sum rule and the response function to earlier calculations based on different methods. As expected from the power counting of the chiral expansion of electromagnetic currents and from previous studies, our results retaining only one-body term underestimate the experimental data for He4 by about 20%. However, when the method is applied to Ca40 at the same order of the expansion, response functions do not lack strength and agree well with the world electron scattering data. We discuss various sources of theoretical uncertainties and comment on the comparison of our results with the available experiments.
| Original language | English |
|---|---|
| Article number | 025502 |
| Journal | Physical Review C |
| Volume | 109 |
| Issue number | 2 |
| DOIs | |
| State | Published - Feb 2024 |
Funding
This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Grant Agreement No. 101026014. This work was supported by the Deutsche Forschungsgemeinschaft (DFG) through the Cluster of Excellence “Precision Physics, Fundamental Interactions, and Structure of Matter” ( EXC 2118/1) funded by the DFG within the German Excellence Strategy (Project ID No. 39083149). It is also supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under Award No. DE-SC0018223 (SciDAC-4 NUCLEI) and the SciDAC-5 NUCLEI collaboration, and by the Office of High Energy Physics, U.S. Department of Energy, under Contract No. DE-AC02-07CH11359 through the Neutrino Theory Network Fellowship awarded to B.A. Computer time was provided by the supercomputer MogonII at Johannes Gutenberg-Universität Mainz, and by the Innovative and Novel Computational Impact on Theory and Experiment (INCITE) programme. This research used resources of the Oak Ridge Leadership Computing Facility located at Oak Ridge National Laboratory, which is supported by the Office of Science of the Department of Energy under Contract No. DE-AC05-00OR22725.