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Three- and four-nucleon systems from chiral effective field theory
E Epelbaum1, H Kamada, A Nogga
1Forschungszentrum Jülich, Institut für Kernphysik (Theorie), D-52425 Jülich, Germany.
New chiral nucleon-nucleon (NN) forces accurately predict three- and four-nucleon (3N and 4N) system properties. These advanced forces resolve long-standing nuclear physics puzzles, showing weak cutoff dependence.
Area of Science:
- Nuclear Physics
- Quantum Chromodynamics (QCD)
Background:
- Chiral nucleon-nucleon (NN) forces at next-to-leading order (NLO) have been developed.
- These forces describe NN phase shifts up to approximately 100 MeV effectively.
Purpose of the Study:
- To apply recently developed chiral NN forces to 3N and 4N systems.
- To rigorously solve Faddeev-Yakubovsky equations for these systems.
- To investigate the performance of NLO chiral forces in nuclear systems.
Main Methods:
- Rigorous solution of Faddeev-Yakubovsky equations.
- Application of chiral NN forces at NLO to 3N and 4N systems.
- Analysis of scattering observables and binding energies.
Main Results:
- 3N and 4N binding energies are comparable to those from standard NN potentials.
- Low-energy 3N scattering observables are well reproduced.
- The anomalous analyzing power (A(y)) puzzle is absent at NLO.
- Scattering observables exhibit weak cutoff dependence.
Conclusions:
- NLO chiral NN forces provide a robust framework for describing few-nucleon systems.
- These forces successfully address limitations of previous models, including the A(y) puzzle.
- The weak cutoff dependence suggests the reliability and predictive power of these forces.
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