Comparative study of three-nucleon force models in A=3,4 systems

A. Kievsky, M. Viviani, L. Girlanda, and L. E. Marcucci
Phys. Rev. C 81, 044003 – Published 28 April 2010

Abstract

Using modern nucleon-nucleon interactions in the description of A=3,4 nuclei, it is not possible to reproduce both the three- and the four-nucleon binding energies simultaneously. This is one manifestation of the necessity of including a three-nucleon force in the nuclear Hamiltonian. In this paper we perform a comparative study of some widely used three-nucleon force models. We analyze their capability to describe the aforementioned binding energies as well as the n-d doublet scattering length. The correct description of these quantities can be considered a stringent requirement for a nuclear Hamiltonian containing two- and three-nucleon interaction terms. As we show, this requirement is not fulfilled by several of the models available in the literature. To satisfy it, we propose modifications in the parametrization of the three-nucleon forces and we study their effects on a few selected N-d low-energy scattering observables.

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  • Received 5 February 2010

DOI:https://doi.org/10.1103/PhysRevC.81.044003

©2010 American Physical Society

Authors & Affiliations

A. Kievsky1,*, M. Viviani1, L. Girlanda2, and L. E. Marcucci2

  • 1Istituto Nazionale di Fisica Nucleare, Largo Pontecorvo 3, I-56127 Pisa, Italy
  • 2Dipartimento di Fisica, Università di Pisa, Largo Pontecorvo 3, I-56127 Pisa, Italy

  • *kievsky@pi.infn.it

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Vol. 81, Iss. 4 — April 2010

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