Four-nucleon system with $Δ$-isobar excitation

Details Four-nucleon system with $Δ$-isobar excitation Four-nucleon system with $Δ$-isobar excitation

2008-01-17

arxiv.org/abs/0801.2743v1

Phys.Lett.B660:471-477,2008

Physics

Nuclear Physics

Nuclear Theory

11 figures, to be published in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2007.12.058

The four-nucleon bound state and scattering below three-body breakup threshold are described based on the realistic coupled-channel potential CD Bonn + $\Delta$ which allows the excitation of a single nucleon to a $\Delta$ isobar. The Coulomb repulsion between protons is included. In the four-nucleon system the two-baryon coupled-channel potential yields effective two-, three- and four-nucleon forces, mediated by the $\Delta$ isobar and consistent with each other and with the underlying two-nucleon force. The effect of the four-nucleon force on the studied observables is much smaller than the effect of the three-nucleon force. The inclusion of the $\Delta$ isobar is unable to resolve the existing discrepancies with the experimental data.

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