Knocking Out Nucleon Associations From the Nucleus With Light Nuclei

Yıl 2016, Cilt: 37 (2016): Special Issue I, 8 - 13, 27.11.2016

İ. G. Afandıyeva

Öz

Abstract. The cluster model applied to study associative knocking out light nuclei in the A(X, XY)A-Y processes.  Contemporary quantum - mechanical description of cluster characteristics of atomic nuclei are discussed. Within this model, interaction of the associations is described by local potential. The internal structure of the associations is neglect and effects of the Pauli principle between the nucleons in the associations are taken into account by introducing short range repulsion between the associations. It is assumed that the amplitude of the interaction of nucleons of the incident nucleus with the nucleons of the target nucleus are the same as in the case of a collision free nucleons. Since the formation of associations, most likely on the surface area of the nuclei, then to study them in the first place it is necessary to carry out studies of nuclear processes, extending to the surface of the nucleus. These are direct nuclear reactions. The association effect is significant when the scattering particles with light nuclei has intermediate energy and it appears the stronger the higher the energy of the incident particle. When the energy of the incident particle is large compared nucleon energy in the nucleus, the transit time of a particle in the nucleus will be small in comparison with the characteristic time for the exchange of nucleons associations. Therefore such a particle sees, that these core consisting of associations, as during its interaction with the nucleus, the associations did not have time to exchange by nucleons. Study was carried out in the impulse approximation with plane waves and based on Gaussian potential. Analysis of cross section held at the microscopic level. The considered energy region lies below the threshold meson production. The results are given in the work related to the analysis of the effective cross section. However, it is not difficult to extend the considered model to calculate the angular dependence of the characteristics of the reactions that are associated with the off-diagonal elements of the density matrix, such as the polarization of the final particles.

Keywords: Nucleon association, scattering, impulse approximation, Gaussian potential