6 research outputs found
Can realistic nuclear interactions tolerate a resonant tetraneutron ?
The possible existence of four-neutron resonances close to the physical
energy region is explored. Faddeev-Yakubovsky equations have been solved in
configuration space using realistic nucleon-nucleon interaction models. Complex
Scaling and Analytical Continuation in the Coupling Constant methods were used
to follow the resonance pole trajectories, which emerge out of artificially
bound tetraneutron states. The final pole positions for four-neutron states lie
in the third energy quadrant with negative real energy parts and should thus
not be physically observable.Comment: 10 pages, 6 figs, 2 tables. To be published in Phys. Rev.
Testing Non-local Nucleon-Nucleon Interactions in the Four-Nucleon Systems
The Faddeev-Yakubovski equations are solved in configuration space for the -particle and n-H continuum states. We test the ability of nonlocal
nucleon-nucleon interaction models to describe 3N and 4N systems.Comment: 16 pages, 6 figure
Description of He tetramer bound and scattering states
Faddeev-Yakubovski equations are solved numerically for 4He tetramer and
trimer states using realistic helium-helium interaction models. We describe the
properties of ground and excited states, and we discuss with a special emphasis
the 4He-4He3 low energy scattering
The Lorentz Integral Transform (LIT) method and its applications to perturbation induced reactions
The LIT method has allowed ab initio calculations of electroweak cross
sections in light nuclear systems. This review presents a description of the
method from both a general and a more technical point of view, as well as a
summary of the results obtained by its application. The remarkable features of
the LIT approach, which make it particularly efficient in dealing with a
general reaction involving continuum states, are underlined. Emphasis is given
on the results obtained for electroweak cross sections of few--nucleon systems.
Their implications for the present understanding of microscopic nuclear
dynamics are discussed.Comment: 83 pages, 31 figures. Topical review. Corrected typo
Solutions of the Faddeev-Yakubovsky equations for the four nucleons scattering states
The Faddeev-Yakubowsky equations in configuration space have been solved for
the four nucleon system. The results with an S-wave interaction model in the
isospin approximation are presented. They concern the bound and scattering
states below the first three-body threshold. The elastic phase-shifts for the
N+NNN reaction in different () channels are given and the corresponding
low energy expansions are discussed. Particular attention is payed to the n+t
elastic cross section. Its resonant structure is well described in terms of a
simple NN interaction. First results concerning the S-matrix for the coupled
N+NNN-NN+NN channels and the strong deuteron-deuteron scattering length are
obtained.Comment: latex.tar.gz, 36 pages, 10 figures, 11 tables. To be published in
Physical Review