Results 1 - 10 of 8341
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[en] For n non relativistic fermions and for fairly general one-body and two-body interactions, the Hamiltonian is a selfadjoint extension of a simple Hermitian operator. Several consequences for the discrete eigenvalues are deduced from this property, such as new integral equations and the coupling of the eigenvalues for n-fermions to the eigenvalues for n-1 fermions
[fr]L'hamiltonien d'un systeme de n fermions non relativistes en interaction a 1 ou 2 corps est une extension auto-adjointe d'un operateur hermitien simple. On en deduit plusieurs consequences quant aux valeurs propres discretes, telles que de nouvelles equations integrales et le couplage des valeurs propres pour n fermions aux valeurs propres pour n-1 fermions
[en] Two-body systems of predictive mechanics are compared with single particle systems in a potential. Study of the limit where one of the bodies is fixed
[fr]En mecanique predictive on compare les systemes a deux corps avec les systemes d'une particule dans un potentiel. Etude de la limite ou une des deux particules est fixe
[en] The two-body scattering problem is generalized in L2(R3) for Schroedinger operators with momentum dependent interactions. Wave operators are derived
[fr]On generalise le probleme de la diffusion a deux corps dans L2(R3) pour les operateurs de Schroedinger avec des interactions dependant de l'impulsion. On definit des operateurs d'ondes
[en] We propose a new approach to treat the nucleon structure in terms of an effective chiral Lagrangian. The state vector of the nucleon is defined on the light front plane and is decomposed in Fock components. An adequate Fock sector dependent renormalization scheme is applied. We present our first results of the calculation of nucleon properties in a two-body Fock truncation.
[en] The two-particle correlations of identical pions having similar momenta are discussed within the framework of a specific model in which the single-particle sources are quantum-mechanically open-quotes boundclose quotes to specific spatial points. The size of the source is determined by the dependence of the wave function on its distance from a open-quotes central point.close quotes It is shown that abandonment of the idea of tightly bound point sources leads to a redefinition of the pion-production region. The model discussed here includes the special cases of tightly bound sources and free sources within a limited spatial cavity as special limits. 1 ref
[en] We explore the properties of weakly bound bosonic states in the strongly interacting regime. Combining a correlated-Gaussian basis set expansion with a complex-scaling method, we extract the energies and structural properties of bosonic cluster states with N≤6 for different two-body potentials. The identification of five- and six-body resonances attached to the first-excited-Efimov trimer provides strong support to the premise of Efimov universality in bosonic systems. Our study also reveals a rich structure of bosonic cluster states. Besides the lowest cluster states that behave as bosonic droplets, we identify cluster states weakly bound to one or two atoms forming effective cluster-atom dimers and cluster-atom-atom 'trimers'. The experimental signatures of these cluster states are discussed.