Elastic scattering for the B8 and Be7+Pb208 systems at near-Coulomb barrier energies (original) (raw)

7Be,8B+208Pb Elastic Scattering at Above-Barrier Energies

Journal of Physics: Conference Series, 2013

Angular distributions for the elastic scattering of 7 Be and 8 B by an enriched 208 Pb target were measured at the Radioactive Ion Beam Line at Lanzhou (RIBLL). The incident energies of the radioactive beams were about three times the respective Coulomb barriers. A suppressed Coulomb-nuclear Interference Peak (CNIP) is not observed for 8 B, a pronounced proton halo nucleus. Optical model fits were performed using Woods-Saxon potentials and the total reaction cross sections deduced. The results are discussed.

Elastic scattering for the system 11Be + 209Bi at Coulomb barrier energies

The European Physical Journal Special Topics, 2007

The elastic scattering process for 11 Be ions impinging on a 209 Bi target was studied in the energy range around the Coulomb barrier. The angular distributions of the 11 Be scattered particles were analyzed within the optical model framework in order to evaluate the reaction cross section, which turned out to be much larger than the fusion one, especially in the sub-barrier region. The comparison with the system 9 Be + 209 Bi showed that the reaction cross section is larger for the reaction 11 Be + 209 Bi in the energy range around the Coulomb barrier, while they are rather similar at higher bombarding energies. This result suggests that direct processes related to the 11 Be halo structure and lower binding energy are more relevant at near-barrier energies.

^{7,9,10}Be elastic scattering and total reaction cross sections on a ^{12}C target

Physical Review C, 2011

Elastic scattering angular distributions for 7 Be, 9 Be, and 10 Be isotopes on 12 C target were measured at laboratory energies of 18.8, 26.0, and 23.2 MeV, respectively. The analysis was performed in terms of optical model potentials using Woods-Saxon and double-folding form factors. Also, continuum discretized coupled-channels calculations were performed for 7 Be and 9 Be + 12 C systems to infer the role of breakup in the elastic scattering. For the 10 Be + 12 C system, bound states coupled-channels calculations were considered. Moreover, total reaction cross sections were deduced from the elastic scattering analysis and compared with published data on other weakly and tightly bound projectiles elastically scattered on the 12 C target, as a function of energy.

Experimental study of He6+Be9 elastic scattering at low energies

Physical Review C, 2011

New data for the He6+Be9 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 phenomenological imaginary part of Woods-Saxon type. In addition, three- and four-body continuum-discretized coupled-channels calculations have been performed to investigate the effect of the projectile breakup on the elastic scattering. Both effects, the coupling to target and projectile excited states, are found to affect significantly the elastic scattering. The trivial local polarization potential extracted from the continuum-discretized coupled-channels calculations indicates that continuum couplings produce a repulsive real part and a long-range imaginary part in the projectile-target interaction.

Four-body effects on9Be+208Pb scattering and fusion around the Coulomb barrier

Journal of Physics: Conference Series, 2015

We investigate the 9 Be+ 208 Pb elastic scattering and fusion at energies around the Coulomb barrier. The 9 Be nucleus is described in a α + α + n three-body model, using the hyperspherical coordinate method. The scattering with 208 Pb is then studied with the Continuum Discretized Coupled Channel (CDCC) method, where the α + α + n continuum is approximated by a discrete number of pseudostates. Optical potentials for the α+ 208 Pb and n+ 208 Pb systems are taken from the literature. We present elastic-scattering and fusion cross sections at different energies, and investigate the convergence with respect to the truncation of the α + α + n continuum. A good agreement with experiment is obtained, considering that there is no parameter fitting. We show that continuum effects increase at low energies.

Reaction Dynamics for the Systems 7Be, 8B + 208Pb at Coulomb Barrier Energies

Journal of Physics: Conference Series, 2018

In this contribution we describe the first results obtained for the investigation of the elastic scattering process in the reactions induced by the Radioactive Ion Beams 7 Be and 8 B on a 208 Pb target at Coulomb barrier energies. The experimental data were analyzed within the framework of the optical model in order to extract the total reaction cross section. The comparison with data available in literature for reactions induced on 208 Pb by light ions in the mass range A = 6-8 shows that the loosely-bound 8 B has the largest reactivity.

Investigation of 9,10Be weakly bound nuclei elastically scattered from 208Pb

Revista Mexicana de Física

Experimental angular distributions for the weakly bound 9,10Be nuclei elastically scattered from 208Pb target at various energies are investigated using phenomenological and microscopic potentials. The considered data in this study is: 9Be+208Pb in the energy range of 37.0–75.0 MeV and 10Be+208Pb in the energy range of 38.4–43.9 MeV. The performed analysis reflects the nature and peculiarities of the considered projectiles. For the 9Be+208Pb nuclear system, the data showed a typical Fresnel diffraction scattering pattern and the Coulomb rainbow phenomenon is well presented due to the interference between partial waves refracted by the Coulomb and nuclear potentials. The 7Li+d and 9Be+n cluster structures of 9Be and 10Be, respectively are studied. The extracted renormalization factors for the real part of potential constructed on the basis of double folding as well as cluster folding could reflect the nature of the loosely bound projectiles.

Elastic scattering of a proton-halo nucleus: 8B+58Ni

2000

The elastic channel of the 8B + 58Ni system has been measured at energies around the Coulomb barrier. An optical potential fi to the experimental angular distributions is obtained. The total reaction cross section consistent with the obtained potential is reported and possible deviations from normal behaviour are discussed.

Be9+Sn120 scattering at near-barrier energies within a four-body model

Physical Review C, 2018

Cross sections for elastic and inelastic scattering of the weakly-bound 9 Be nucleus on a 120 Sn target have been measured at seven bombarding energies around and above the Coulomb barrier. The elastic angular distributions are analyzed with a four-body continuum-discretized coupled-channels (CDCC) calculation, which considers 9 Be as a three-body projectile (α + α + n). An optical model analysis using the São Paulo potential is also shown for comparison. The CDCC analysis shows that the coupling to the continuum part of the spectrum is important for the agreement with experimental data even at energies around the Coulomb barrier, suggesting that breakup is an important process at low energies. At the highest incident energies, two inelastic peaks are observed at 1.19(5) and 2.41(5) MeV. Coupled-channels (CC) calculations using a rotational model confirm that the first inelastic peak corresponds to the excitation of the 2 + 1 state in 120 Sn, while the second one likely corresponds to the excitation of the 3 − 1 state.