Effect of the three-nucleon force on the three-nucleon ground state: Reducible and irreducible contributions
Author(s) -
Alfred Stadler,
P. U. Sauer
Publication year - 1992
Publication title -
physical review c
Language(s) - English
Resource type - Journals
eISSN - 1089-490X
pISSN - 0556-2813
DOI - 10.1103/physrevc.46.64
Subject(s) - ground state , physics , binding energy , nucleon , excitation , pion , cutoff , energy (signal processing) , irreducible representation , particle physics , nuclear force , nuclear physics , atomic physics , quantum mechanics
The Tucson-Melbourne two-pion exchange three-nucleon force is split into a reducible part mediated by {Delta} excitation and an irreducible part not mediated by {Delta} excitation. The triton binding energy is calculated. The irreducible part of the Tucson-Melbourne force is taken into account in the calculation. Its reducible part is discarded, but regenerated by the explicit treatment of the {Delta} isobar in a coupled-channel approach. The remaining irreducible part of the Tucson-Melbourne force makes a nonnegligible contribution to the triton binding energy. The strong dependence of the triton binding energy on the cutoff parameter for the {pi}{ital NN} vertex in the Tucson-Melbourne force is considerably reduced.
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