Bulg. J. Phys. vol.44 no.S1 (2017), pp. 049-059



Elastic Scattering and Breakup Reactions of 8B Proton-Halo Projectile on Nuclear Targets at Energies 20 < E < 170 MeV

M.K. Gaidarov1, V.K. Lukyanov2, D.N. Kadrev1, E.V. Zemlyanaya2, K.V. Lukyanov2, A.N. Antonov1, K. Spasova1
1Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Sofia 1784, Bulgaria
2Joint Institute for Nuclear Research, Dubna 141980, Russia
Abstract. A microscopic analysis of the optical potentials (OPs) and cross sections of elastic scattering of 8B on 12C, 58Ni, and 208Pb targets at energies 20 < E < 170 MeV is carried out. The real part of the OP is calculated by a folding procedure and the imaginary part is obtained on the base of the high-energy approximation (HEA). The density distributions of 8B obtained within the variational Monte Carlo (VMC) model and the three-cluster model (3CM) are used to construct the potentials. In the hybrid model, the only free parameters are the depths of the real and imaginary parts of OP obtained by fitting the experimental data. The use of HEA to estimate the imaginary OP at energies just above the Coulomb barrier is discussed. The analysis of the behavior of 3CM and VMC densities and the corresponding OPs in comparison with the fitted Woods-Saxon OP gives additional information on the decisive role of the nuclear surface on the elastic scattering mechanism in the particular example of 8B+58Ni cross sections measured in a wide range of angles and energies of 20.7, 23.4, 25.3, 27.2, and 29.3 MeV. In addition, cluster model, in which 8B consists of a p-halo and the 7Be core, is applied to calculate the breakup cross sections of 8B nucleus on 9Be, 12C, and 197Au targets, as well as momentum distributions of 7Be fragments. A good agreement of the theoretical results with the available experimental data is obtained.

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