27 documents found, page 1 of 3
Model independence of scattering of three identical bosons in two dimensions
Adhikari, Sadhan K. [UNESP]; Delfino, A.; Frederico, T.; Tomio, Lauro [UNESP]Made available in DSpace on 2022-04-28T19:59:54Z (GMT). No. of bitstreams: 0 Previous issue date: 1993-01-01; Within the framework of scattering integral equations in momentum space, we present numerical results of scattering of three identical bosons at low energies in two dimensions for short-range separable potentials. An analysis of the present numerical results reveals the three-particle scattering observa...
Long range local effective potential for a three-particle system
Delfino, A.; Frederico, T.; Tomio, Lauro [UNESP]Made available in DSpace on 2022-04-28T20:01:33Z (GMT). No. of bitstreams: 0 Previous issue date: 1988-01-01; We derive the long- range behavior of an effective interaction for a system with three identical particles. We start our derivation from the zero range theory in configuration space and we show that the asymptotic effective potential, in the relative distance of the subsystem to the third particle, goes...
Scaling limit of weakly bound triatomic states
Frederico, T.; Tomio, Lauro [UNESP]; Delfino, A.; Amorim, A. E.A.Made available in DSpace on 2022-04-28T19:53:23Z (GMT). No. of bitstreams: 0 Previous issue date: 1999-01-01; The usefulness of a scale-independent approach to identify Efimov states in three-body systems is shown by comparing such an approach with a realistic calculation in the case of three helium atoms. We show that the scaling limit is realized in practice in this case, and suggest its application to study ...
Efimov and Thomas effects and the model dependence of three-particle observable...
Adhikari, Sadhan K.; Delfino, A.; Frederico, T.; Goldman, I. D.; Tomio, Lauro [UNESP]Made available in DSpace on 2022-04-28T19:53:33Z (GMT). No. of bitstreams: 0 Previous issue date: 1988-01-01; It is demonstrated for the three-dimensional three-particle system that a divergence arising from essentially the same singularity structure of the kernel of the scattering integral equation is responsible for both the Efimov and Thomas effects. The above divergence implies that the results of a three-p...
Microscopic approach for the n-d effective interaction
Tomio, Lauro [UNESP]; Frederico, T.; Delfino, A.Made available in DSpace on 2022-04-28T20:34:43Z (GMT). No. of bitstreams: 0 Previous issue date: 1990-01-01; A three-boson model is applied to the nucleon-deuteron (n-d) system to construct an effective energy-dependent two-body potential in configuration space. The three-nucleon observables at low energy are well reproduced with just one free parameter (related with the range of the nucleon-nucleon interactio...
Three-body collapse for Tabakin potentials and the Thomas effect
Delfino, A.; Adhikari, Sadhan K. [UNESP]; Tomio, Lauro [UNESP]; Frederico, T.Made available in DSpace on 2022-04-28T20:40:10Z (GMT). No. of bitstreams: 0 Previous issue date: 1992-01-01; A system constituted of three bosons interacting via two-body separable potentials with fixed two-boson binding is known to lead to bound-state collapse in the case where the potential parameters allow two-boson S-matrix poles close to (resonance) and on (continuum bound state) the real momentum axis. T...
Charged three-body system with arbitrary masses near conformal invariance
Delfino, A.; Frederico, T.; Tomio, Lauro [UNESP]Made available in DSpace on 2022-04-28T20:58:07Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-11-30; Within an adiabatic approximation to the three-body Coulomb system, we study the strength of the leading-order conformaly invariant attractive dipole interaction produced when a slow charged particle q3 (with mass m3) is captured by the first-excited state of a dimer [with individual masses and charges ...
Virtual states of light non-Borromean halo nuclei
Delfino, A.; Frederico, T.; Hussein, M. S.; Tomio, Lauro [UNESP]Made available in DSpace on 2022-04-29T08:14:43Z (GMT). No. of bitstreams: 0 Previous issue date: 2000-01-01; It is shown that three-body non-Borromean halo nuclei like [Formula Presented] [Formula Presented] considered as neutron-neutron-core systems, have p-wave virtual states with energy of about 1.7 times the corresponding neutron-core binding energy. We use a renormalizable model that guarantees the genera...
Weakly bound atomic trimers in ultracold traps
Yamashita, M. T.; Frederico, T.; Tomio, Lauro [UNESP]; Delfino, A.Made available in DSpace on 2022-04-29T08:26:50Z (GMT). No. of bitstreams: 0 Previous issue date: 2003-01-01; The experimental three-atom recombination coefficients of the atomic states [Formula Presented] [Formula Presented] and [Formula Presented] together with the corresponding two-body scattering lengths, allow predictions of the trimer bound-state energies for such systems in a trap. The recombination para...
Scaling limit of virtual states of triatomic systems
Yamashita, M. T.; Frederico, T.; Delfino, A.; Tomio, Lauro [UNESP]Made available in DSpace on 2022-04-29T08:26:52Z (GMT). No. of bitstreams: 0 Previous issue date: 2002-01-01; For a system with three identical atoms, the dependence of the s-wave virtual state energy on the weakly bound dimer and trimer binding energies is calculated in the form of a universal scaling function. The scaling function is obtained from a renormalizable three-body model with a pairwise Dirac-[Formu...