The importance of few-nucleon forces in chiral effective field theory

Yang, Chieh-Jen,1977Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering,Chalmers tekniska högskola,Chalmers University of Technology (author)

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.

Ekström, Andreas,1980Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)andeks (author)
Forssén, Christian,1974Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)f2bcf (author)
Hagen, G.University of Tennessee,Oak Ridge National Laboratory (author)
Rupak, G. (author)
Kolck, U. vanUniversity of Arizona,Université Paris-Saclay,University Paris-Saclay (author)
Horia Hulubei National Institute for R&D in Physics and Nuclear EngineeringChalmers tekniska högskola (creator_code:org_t)

By the author/editor: Yang, Chieh-Jen, ...; Ekström, Andreas ...; Forssén, Christi ...; Hagen, G.; Rupak, G.; Kolck, U. van

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