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Two- and three-nucleon contact interactions and ground-state energies of light- and medium-mass nuclei

Journal Article · · Physical Review. C
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [4]
  1. Old Dominion Univ., Norfolk, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States). Theory Center
  2. University of Salento, Lecce (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Lecce (Italy)
  3. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States). Theory Center; Univ. of Pisa (Italy)
  4. Istituto Nazionale di Fisica Nucleare (INFN), Pisa (Italy)
  5. Argonne National Lab. (ANL), Argonne, IL (United States); stituto Nazionale di Fisica Nucleare (INFN), Trento (Italy). INFN-TIFPA Trento Institute of Fundamental Physics and Applications
  6. Univ. of Pisa (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Pisa (Italy)
  7. Washington Univ., St. Louis, MO (United States)
Classes of two-nucleon (2N) contact interactions are developed in configuration space at leading order (LO), next-to-leading order (NLO), and next-to-next-to-next-to-leading order (N3LO) by fitting the experimental singlet np scattering length and deuteron binding energy at LO, and np and pp scattering data in the laboratory-energy ranges 0–15 MeV at NLO and 0–25 MeV at N3LO. These interactions are regularized by including two Gaussian cutoffs, one for T = 0 and the other for T = 1 channels. The cutoffs are taken to vary in the ranges R0 = (1.5 –2.3) fm and R1 = (1.5 –3.0) fm. The 780 (1100) data points up to 15 (25) MeV energy, primarily differential cross sections, are fitted by the NLO (N3LO) models with a χ2/ datum about 1.7 or less (well below 1.5), when harder cutoff values are adopted. As a first application, we report results for the binding energies of nuclei with mass numbers A = 3 –6 and 16 obtained with selected LO and NLO 2N models both by themselves as well as in combination with a LO three-nucleon (3N) contact interaction. The latter is characterized by a single low-energy constant that is fixed to reproduce the experimental 3H binding energy. The inclusion of the 3N interaction largely removes the sensitivity to cutoff variations in the few-nucleon systems and leads to predictions for the 3He and 4He binding energies that cluster around 7.8 and 30 MeV, respectively. However, in 16O this cutoff sensitivity remains rather strong. Finally, predictions at LO only are also reported for medium-mass nuclei with A = 40 , 48, and 90.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Laboratory Computing Resource Center (LCRC); Argonne National Laboratory (ANL), Argonne, IL (United States). Argonne Leadership Computing Facility (ALCF); Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC02-06CH11357; AC05-06OR23177; SC0013617
OSTI ID:
1785345
Alternate ID(s):
OSTI ID: 1909669
Report Number(s):
DOE/OR/23177-5135; JLAB-THY-21-3314; arXiv:2102.02327
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 5 Vol. 103; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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