Three- and four-nucleon systems from chiral effective field theory.
Recently developed chiral nucleon-nucleon (NN) forces at next-to-leading order (NLO), that describe NN phase shifts up to about 100 MeV fairly well, have been applied to 3N and 4N systems. Faddeev-Yakubovsky equations have been solved rigorously. The resulting 3N and 4N binding energies are in the same range as found using standard NN potentials. In addition, low-energy 3N scattering observables are very well reproduced as for standard NN forces. The long-standing A(y) puzzle is absent at NLO. The cutoff dependence of the scattering observables is rather weak.
Epelbaum
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Forschungszentrum Jülich, Institut für Kernphysik (Theorie), D-52425 Jülich, Germany.
Kamada
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Nogga
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A
Witala
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Glöckle
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W
Meissner
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UG