Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2003-08-22
J.Phys. G: Nucl. Part. Phys. 30, 287 (2004)
Physics
Nuclear Physics
Nuclear Theory
26 pages, Latex, 7 figures
Scientific paper
10.1088/0954-3899/30/3/005
A multi-component formalism is developed to describe three-body systems with nonstatic pairwise interactions and non-nucleonic degrees of freedom. The dressed-bag model for $NN$ interaction based on the formation of an intermediate six-quark bag dressed by a $\sigma$-field is applied to the $3N$ system, where it results in a new three-body force between the six-quark bag and a third nucleon. Concise variational calculations of $3N$ bound states are carried out in the dressed-bag model including the new three-body force. It is shown that this three-body force gives at least half the $3N$ total binding energy, while the weight of non-nucleonic components in the $^3$H and $^3$He wavefunctions can exceed 10%. The new force model provides a very good description of $3N$ bound states with a reasonable magnitude of the $\sigma NN$ coupling constant. The model can serve as a natural bridge between dynamical description of few-nucleon systems and the very successful Walecka approach to heavy nuclei and nuclear matter.
Faessler Amand
Kaskulov Murat M.
Kukulin Vladimir I.
Pomerantsev V. N.
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