Microscopic analysis of quasielastic scattering and breakup reactions of the neutron-rich nuclei 12,14Be

A microscopic analysis of the optical potentials (OPs) and cross sections of quasielastic scattering of Be-12,(14) on C-12 at 56 MeV/nucleon and on protons at an energy near 700 MeV is carried out. For lower energy scattering the real part of the OP is calculated by using the double-folding procedure accounting for the antisymmetrization effects, while the imaginary part is obtained on the basis of the high-energy approximation (HEA). The HEA is also applied to the calculations of both real and imaginary OPs when solving the relativistic equation for the high-energy proton-nucleus elastic scattering. The neutron and proton density distributions computed in different microscopic models for Be-12 and Be-14 are used. In the present hybrid model of the optical potential the only free parameters are the depths of the real and imaginary parts of the OP obtained by fitting the experimental data. The role of the inelastic scattering channel to the first excited 2(+) and 3(-) states in C-12 when calculating the quasielastic cross sections, as well as the modified density of the C-12 target accounting for the surface effects, are studied. In addition, the cluster model, in which Be-14 consists of a 2n halo and the Be-12 core, is applied to calculate the cross sections of diffraction breakup and stripping reactions in Be-14 + C-12 scattering and longitudinal momentum distributions of Be-12 fragments at an energy of 56 MeV/nucleon. A good agreement of the theoretical results with the available experimental data of both quasielstic scattering and breakup processes is obtained.