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- Title
The importance of few-nucleon forces in chiral effective field theory.
- Authors
Yang, C.-J.; Ekström, A.; Forssén, C.; Hagen, G.; Rupak, G.; van Kolck, U.
- Abstract
We study the importance of few-nucleon forces in chiral effective field theory for describing many-nucleon systems. A combinatorial argument suggests that three-nucleon forces-which are conventionally regarded as next-to-next-to-leading order-should accompany the two-nucleon force already at leading order (LO) starting with mass number A ≃ 10–20. We find that this promotion enables the first realistic description of the 16 O ground state based on a renormalization-group-invariant LO interaction. We also performed coupled-cluster calculations of the equation of state for symmetric nuclear matter and our results indicate that LO four-nucleon forces could play a crucial role for describing heavy-mass nuclei. The enhancement mechanism we found is very general and could be important also in other many-body problems.
- Subjects
MANY-body problem; NUCLEAR matter; NUCLEON-nucleon scattering; EQUATIONS of state; OXYGEN carriers
- Publication
European Physical Journal A -- Hadrons & Nuclei, 2023, Vol 59, Issue 10, p1
- ISSN
1434-6001
- Publication type
Article
- DOI
10.1140/epja/s10050-023-01149-7