The elastic and rearrangement processes in the four nucleon system with two clusters in the initial and final states can be treated adequately in framework of Yakubovsky differential equations (YDE) approach. Unfortunately, a direct application of YDE to the scattering problem requires huge computer resources. It is why, new methods allowing a reduction of comlexity of YDE are of interests from...

The importance of the nucleon-nucleon correlations for the ηα S-wave scattering length, and the π 0-η mixing angle in the low energy ηα scattering length model Abstract. Using the new set of dd → ηα near threshold experimental data, the estimate of the importance of the nucleon-nucleon correlations for the ηα S-wave scattering length in the multiple scattering theory is obtained using the low e...

Various modern nucleon-nucleon (NN) potentials yield a very accurate fit to the nucleon-nucleon scattering phase shifts. The differences between these interactions in describing properties of nuclear matter are investigated. Various contributions to the total energy are evaluated employing the Hellmann-Feynman theorem. Special attention is paid to the two-nucleon correlation functions derived f...

The effect of pion-pion scattering resonance on the isovector part of nucleon structure is analysed by a method similar to that of Frazer and Fulco, but with one more subtraction for dispersion relations on helicity amplitudes of nucleon·aritinucleon production process in order to remedy the divergence regarding the left-hand cut. If the subtracted spectral representations are used for the form...

Neutron-deuteron elastic scattering cross sections are calculated at different energies using modern nucleon-nucleon (NN) interactions and the Tucson-Melbourne three-nucleon force adjusted to the triton binding energy. Predictions based on NN forces only underestimate nucleon-deuteron data in the minima at higher energies starting around 60 MeV. Adding the three-nucleon forces fills up those mi...

We have performed the first high precision measurement of the coherent neutron scattering length of deuterium in a pure sample using neutron interferometry. We find b(nd)=(6.665+/-0.004) fm in agreement with the world average of previous measurements using different techniques, b(nd)=(6.6730+/-0.0045) fm. We compare the new world average for the nd coherent scattering length b(nd)=(6.669+/-0.00...

We calculate decuplet contributions to the s-wave pseudoscalar meson octet-baryon scattering lengths to the third order in heavy baryon chiral perturbation theory (HBχPT). Using experimental pion-nucleon and kaon-nucleon scattering lengths as inputs, we determine low-energy constants and predict other meson-baryon scattering lengths. Numerically we consider three cases: (1) the case with only b...

Exclusive proton–antiproton annihilation into two photons can be viewed as the Compton process in the crossed channel. At large s (≈ 10 GeV 2) and |t|, |u| ∼ s this process can be described by a generalized partonic picture, analogous to the " soft mechanism " in wide–angle real Compton scattering. The two photons are emitted in the annihilation of a single fast quark and antiquark (" handbag g...

A relativistic light front treatment of nuclei is developed by performing light front quantization for a chiral Lagrangian. The energy momentum tensor and the appropriate Hamiltonian are obtained. Three illustrations of the formalism are made. (1) Pion-nucleon scattering at tree level is shown to reproduce soft pion them-ems. (2) The one boson exchange trest ment of nucleon-nucleon scattering i...

We have developed a simulation of quasielastic electron scattering off nucleons in deuterium. The original code was developed by J.Lachniet for the analysis of the CLAS6 GM experiment. The Fermi motion of the nucleons creates an effective beam energy different from the laboratory one as seen from the rest frame of the moving nucleon. This effective beam energy is used with the Hulthen distribut...