Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2000-03-29
Eur.Phys.J. A7 (2000) 559-571
Physics
Nuclear Physics
Nuclear Theory
22 pages, 8 figures; to appear in Eur. Phys. J. A
Scientific paper
The contribution of a $\pi \pi$-exchange three-body force to the three-nucleon binding energy is calculated in terms of a $\pi N$ amplitude. The latter is based on a meson-theoretical model of $\pi N$ interaction developed by the J\"ulich group. Similar to a previous study based on simple phenomenological $\pi N$ potentials a very small effect of the resulting three-body force is found. Possible origins of the two-orders-of-magnitude descrepancy between the present result and the values obtained for the Tucson-Melbourne three-body force are investigated. Evidence is provided that this discrepancy is most likely due to strikingly different off-shell properties of the $\pi N$ amplitudes underlying the two approaches.
Haidenbauer Johann
Saito T.-Y.
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