Four-nucleon system with $\Delta$-isobar excitation
Abstract
The four-nucleon bound state and scattering below three-body breakup threshold are described based on the realistic coupled-channel potential CD Bonn + which allows the excitation of a single nucleon to a 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 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 isobar is unable to resolve the existing discrepancies with the experimental data.
Cite
@article{arxiv.0801.2743,
title = {Four-nucleon system with $\Delta$-isobar excitation},
author = {A. Deltuva and A. C. Fonseca and P. U. Sauer},
journal= {arXiv preprint arXiv:0801.2743},
year = {2008}
}
Comments
11 figures, to be published in Phys. Lett. B