GUIMARÃES , V.

Coupled reaction channels calculations were performed for the 16O(d,n)17F and 16O(d,p)17O transfer reactions for the ground and first excited states at several energies from Elab=2.29 MeV up to 3.27 MeV. A strong polarization effect between the entrance channel and the transfer, 16O(d,n)17F (1/2+,0.495) and 16O(d,n)17O (1/2+,0.87), channels was...

Background: The influence of halo structure of 6 He, 8 B, 11Be, and 11Li nuclei in several mechanisms such as direct reactions and fusion is already established, although not completely understood. The influence of the 10C Brunnian structure is less known. Purpose: To investigate the influence of the cluster configuration of 10C on the elastic...

Elastic scattering and breakup angular distributions of the weakly bound radioactive nucleus 8 B on a 208Pb target at an incident energy of 238 MeV, which corresponds to four times the Coulomb barrier, have been measured at the HIRFL-RIBLL facility (Institute of Modern Physics, Lanzhou). The data have been analyzed using the optical model and...

The elastic-scattering angular distribution for 8Li on 12C has been measured at ELAB=23.9 MeV with 8Li radioactive nuclear beam produced by the Radioactive Ion Beams in Brazil facility. This angular distribution was analyzed in terms of optical-model with Woods-Saxon and double-folding São Paulo potential. The roles of the breakup and inelastic...

The collision 6He+120Sn has been investigated at four energies near the Coulomb barrier. A large yield of α particles has been detected, with energies around the energy of the scattered 6He beam. The energy and angular distributions of the α particles have been analyzed and compared with breakup and neutron transfer calculations.

Angular distributions for the 11 B+25 Mg elastic scattering, 25 Mg (11B, 12 C) 24 Na proton pickup, and 25 Mg (11 B, 10 Be) 26 Al stripping reactions have been measured at E11 B=35 MeV. The angular distributions have been analyzed by the distorted-waves Born approximation calculations using the code fresco. The...

An elastic backscattering experiment has been performed at energies below the Coulomb barrier to investigate static and dynamic effects in the interaction of 6He with 209Bi. The measured cross sections are presented in terms of the dσ/dσRuth ratio, as a function of the distance of closest approach on a Rutherford trajectory. The data are...

Angular distributions of quasielastic scattering and breakup of the neutron-rich halo nucleus 11Be on a 208Pb target at an incident energy of 140 MeV (about 3.5 times the Coulomb barrier) were measured at HIRFL-RIBLL. A strong suppression of the Coulomb nuclear interference peak is observed in the measured quasielastic scattering angular...

The elastic scattering of 6He on 120Sn has been measured at four energies above the Coulomb barrier using the 6He beam produced at the RIBRAS (Radioactive Ion Beams in Brasil) facility. The elastic angular distributions have been analyzed with the optical model and three- and four-body continuum-discretized coupled-channels calculations. The...

New data for the H6e+9Be reaction at Elab=16.2 and 21.3 MeV have been taken and analyzed. The effect of the collective couplings to the excited states of the target has been studied by means of coupled-channels calculations, using a double-folding potential for the bare interaction between the colliding nuclei, supplemented with a...

The elastic scattering of the radioactive halo nucleus 6He on 27Al target was measured at four energies close to the Coulomb barrier using the RIBRAS (Radioactive Ion Beams in Brazil) facility. The São Paulo Potential (SPP) was used and its diffuseness and imaginary strength were adjusted to fit the elastic scattering angular distributions....

We present angular distributions of the He6+Ni58 scattering measured at three bombarding energies above the Coulomb barrier: Elab = 12.2 MeV, 16.5 MeV, and 21.7 MeV. The angular distributions have been analysed in terms of three- and four-body Continuum-Discretized Coupled-Channels calculations considering the effect of the 6He breakup. A...

In this work we present optical model analysis of new near barrier‐quasi‐elastic experimental data, for the systems 6,7Li+120Sn. From the analysis it was possible to extract the ground state nucleon densities of the weakly bound 6,7Li isotopes. The apparent discrepancies between the experimental densities, as compared with those based on...