Total cross section of the reaction γd → π–pp in the threshold energy region

In the framework of the diagrammatic approach, the total cross section of near-threshold π– photoproduction on the deuteron is calculated. Contributions of the diagrams corresponding to the plane wave impulse approximation as well as to NN- and πN-interactions in the final state have been taken into account. We have compared the theoretical predictions with the results of the recent measurements performed at the MAX IV laboratory of the Lund University. There is good agreement with the data at photon energies from 147 to 155 MeV. However, at 158 and 160 MeV, the theoretical predictions significantly overestimate the measured cross sections.

Relative probability of recoilless Λ-production in nuclei in the plane-wave impulse approximation

The problem of estimating the relative probability Ρ of recoilless Λ production in nuclei by means of the (K-,π-) reaction is investigated in the plane-wave impulse approximation, which leads to approximate expressions of the "Debye-Waller type". The values of the relevant average overlap integrals between Λ and neutron normalized harmonic oscillator wave func­ tions are close to 1.

Charge exchange reactions on medium and heavy mass targets at intermediate energies

The nuclear isotopic structure can be understood easily via the intermediate-energy charge exchange reactions of (p, n) and [Formula: see text]He, [Formula: see text] type. In the current contribution, we present some results for charge exchange reactions induced by 3He on targets lying in mass region [Formula: see text] within the theoretical framework of plane wave impulse approximation (PWIA) and distorted wave impulse approximation (DWIA). Here, the recoil effects in PWIA have also been considered. Particularly, the angular distributions and the unit cross-sections have been calculated and compared with the available data. Further, the importance of inclusion of the exchange contribution in these reactions is also considered, which eventually enhance the matching with data.

Analytical forms of the deuteron wave function for Nijmegen group potentials and polarization characteristics of A(d,d′)X reactions

Polarization observables of the [Formula: see text] reactions have been calculated according to the received coefficients of the analytical form for deuteron wave function (DWF) in coordinate space for the nucleon–nucleon Nijmegen group potentials (NijmI, NijmII and Nijm93). The obtained values of tensor [Formula: see text] and vector [Formula: see text] analyzing powers have been compared with the published experimental data at [Formula: see text]-scaling for the inelastic scattering of deuterons on hydrogen, carbon and beryllium. Theoretical values of tensor–tensor [Formula: see text] and vector–vector [Formula: see text] polarization transfers have also been evaluated in the plane-wave impulse approximation.

ASSOCIATED HYPERON–KAON PRODUCTION VIA NEUTRINO–NUCLEUS SCATTERING

We present the investigation of the neutrino-induced strangeness associated production on nuclei in the relativistic plane wave impulse approximation (RPWIA) framework at the intermediate neutrino energies. In this study, the elementary hadronic weak amplitudes are embedded inside the nuclear medium for the description of the exclusive channels of neutrino–nucleus interactions. These amplitudes are extracted using a model-dependent evaluation of the hadronic vertex using the Born term approximation in which the application of the Cabibbo V–A theory and SU(3) symmetry are assumed to be valid. The nuclear effects are included via the bound state wave functions of the nucleon obtained from the relativistic mean field (RMF) models. Two kinematics settings are used to examine various distributions of the differential cross-section in the rest frame of the target nuclei. The numerical results are obtained for the neutrino-induced charged-current (CC) K +Λ-production on bound neutrons in 1s1/2 and 1p3/2 orbitals of 12 C . The angular distributions are forward peaked under both kinematic settings, whereas under the quasifree setting, the cross-sections tend to mimic the missing momentum distribution of the bound nucleon inside the nucleus.