Local chiral interactions and magnetic structure of few-nucleon systems
Journal Article
·
· Physical Review C
- Old Dominion Univ., Norfolk, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Univ. of South Carolina, Columbia, SC (United States)
- Washington Univ. in St. Louis, St. Louis, MO (United States)
- Univ. of Salento, Lecce (Italy); INFN-Lecce, Lecce (Italy)
- INFN-Pisa, Pisa (Italy)
- Argonne National Lab. (ANL), Argonne, IL (United States); INFN-TIFPA, Trento (Italy)
- Univ. of Pisa, Pisa (Italy); INFN-Pisa, Pisa (Italy)
- Argonne National Lab. (ANL), Argonne, IL (United States)
The magnetic form factors of 2H, 3H, and 3He, deuteron photodisintegration cross sections at low energies, and deuteron threshold electrodisintegration cross sections at backward angles in a wide range of momentum transfers are calculated with the chiral two-nucleon (and three-nucleon) interactions including Δ intermediate states that have recently been constructed in configuration space. The A=3 wave functions are obtained from hyperspherical-harmonics solutions of the Schrödinger equation. The electromagnetic current includes one- and two-body terms, the latter induced by one- and two-pion exchange (OPE and TPE, respectively) mechanisms and contact interactions. The contributions associated with Δ intermediate states are only retained at the OPE level and are neglected in TPE loop (tree-level) corrections to two-body (three-body) current operators. Expressions for these currents are derived and regularized in configuration space for consistency with the interactions. The low-energy constants that enter the contact currents are determined by reproducing the magnetic moments of these few-nucleon systems. The predicted form factors and deuteron electrodisintegration cross section are in excellent agreement with experiment for momentum transfers up to 2–3fm–1. However, the experimental values for the deuteron photodisintegration cross section are consistently underestimated by theory, unless use is made of the Siegert form of the electric dipole transition operator. In conclusion, a complete analysis of the results is provided, including the clarification of the origin of the aforementioned discrepancy.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Michigan State Univ., East Lansing, MI (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
- Grant/Contract Number:
- AC02-06CH11357; AC05-06OR23177; SC0010300; SC0013617
- OSTI ID:
- 1504274
- Alternate ID(s):
- OSTI ID: 1502270
OSTI ID: 1505127
OSTI ID: 1607434
OSTI ID: 1542955
- Report Number(s):
- DOE/OR/23177-4541; JLAB-THY--18-2807; arXiv:1809.10180; 147415
- Journal Information:
- Physical Review C, Journal Name: Physical Review C Journal Issue: 3 Vol. 99; ISSN PRVCAN; ISSN 2469-9985
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Local Nucleon-Nucleon and Three-Nucleon Interactions Within Chiral Effective Field Theory
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journal | January 2020 |
| Local nucleon-nucleon and three-nucleon interactions within chiral effective field theory | text | January 2020 |