Analysis of three-nucleon forces effects in the $A=3$ system

Details Analysis of three-nucleon forces effects in the $A=3$ system Analysis of three-nucleon forces effects in the $A=3$ system

2010-11-09

arxiv.org/abs/1011.2075v1

Physics

Nuclear Physics

Nuclear Theory

10 pages, to be published in Few-Body Systems. Presented at the workshop on "Relativistic Description of Two- and Three-body S

Scientific paper

Using modern nucleon-nucleon interactions in the description of the $A=3,4$ nuclear systems the $\chi^2$ per datum results to be much bigger than one. In particular it is not possible to reproduce the three- and four-nucleon binding energies and the $n-d$ scattering length simultaneously. This is one manifestation of the necessity of including a three-nucleon force in the nuclear Hamiltonian. In this paper we perform an analysis of some, widely used, three-nucleon force models. We analyze their capability to describe the aforementioned quantities and, to improve their description, we propose modifications in the parametrization of the models. The effects of these new parametrization are studied in some polarization observables at low energies.

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