19 research outputs found
Nucleon resonances and the production of light vector mesons near thresholds
The production of the light vector mesons in the reactions and near threshold is studied. The subsequent electromagnetic decay is particularly suited for exploring subthreshold resonances
Solar proton burning process revisited within a covariant model based on the Bethe-Salpeter formalism
A covariant model based on the Bethe-Salpeter formalism is proposed for investigating the solar proton burning process and the near-threshold deuteron disintegration via electromagnetic and weak interactions. Results of numerical calculations of the energy dependence of relevant cross sections and the astrophysical low-energy cross section factor of the proton burning process are presented. Our results confirm previous canonical values, and the energy dependence of the factor is rather close to phenomenological extrapolations commonly adopted in computations of solar nuclear reaction rates
Elastic proton deuteron backward scattering: Relativistic effects and polarization observables
The elastic proton-deuteron backward reaction is analyzed within a covariant approach based on the Bethe-Salpeter equation with realistic meson-exchange interaction. Lorentz boost and other relativistic effects in the cross section and spin correlation observables, like tensor analyzing power and polarization transfer etc., are investigated in explicit form. Results of numerical calculations for a complete set of polarization observables are presented
Relativistic description of exclusive deuteron breakup reactions
The exclusive deuteron break-up reaction is analyzed within a covariant approach based on the Bethe-Salpeter equation with realistic meson-exchange interaction. Relativistic effects in the cross section, tensor analyzing power and polarization transfer are investigated in explicit form. Results of numerical calculations are presented for kinematical conditions in forthcoming p + D reactions at COSY
Relativistic effects in proton induced deuteron breakup at intermediate-energies with forward emission of a fast proton pair
Recent data on the reaction pD -> (pp) n with a fast forward pp pair with very small excitation energy is analyzed within a covariant approach based on the Bethe-Salpeter formalism. It is demonstrated that the minimum non-relativistic amplitude is completely masked by relativistic effects, such as Lorentz boost and the negative-energy P components in the 1S_0 Bethe-Salpeter amplitude of the pp pair
Final state interaction within the Bethe-Salpeter approach in charge exchange pD ---> n(pp) process
The exclusive charge exchange reaction pD->n(pp) at intermediate and high energies is studied within the Bethe-Salpeter formalism. The final state interaction in the detected at zero-near excitation energy pp-pair is described by the 1S0 component of the Bethe-Salpeter amplitude. Results of numerical calculations of polarization observables and differential cross-section persuade that, as in the non relativistic case, this reaction can be utilized for a relativistic deuteron tensor polarimeter and as a source of information about the elementary nucleon-nucleon charge exchange amplitude
Charge exchange reaction pD ---> n(p p) in the Bethe-Salpeter approach
The deuteron charge - exchange reaction pD->n(pp) for the low values of momentum transfer and small excitation energies of final pp - pair is considered in the framework of Bethe - Salpeter approach. The method of calculation of the observables is developed for the case, when the pp - pair is in - state. The methodical numerical calculations of the differetial cross sections and tensor analysing powers are presented. The reaction under consideration is predicted to be a solid base for construction of the deuteron tensor polarimeter at high energies, and also to obtain some additional information about elementary nucleon - nucleon charge - exchange amplitude