SciELO - Scientific Electronic Library Online

 issue63Heavy-ion induced two-neutron transfer reactions and the role of pairingStudy of light-particle multiplicities in p + non-fissionable nuclei events in the 0.5 - 2 GeV energy range author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand



  • Have no cited articlesCited by SciELO

Related links

  • Have no similar articlesSimilars in SciELO



On-line version ISSN 2075-5635


ABRIOLA, Daniel et al. Elastic scattering of 9Be+80Se and the breakup threshold anomaly. Nucleus [online]. 2018, n.63, pp. 30-33. ISSN 2075-5635.

We study the threshold anomaly displayed in the energy dependence of optical potentials describing elastic-scattering angular distributions of weakly bound nuclei with three different models: a) a semi-microscopic double folding potential with two free parameters, b) a phenomenological Wood-Saxon potential with six free parameters and c) an exponential potential with two free parameters. In this kind of nuclei, the coupling to the breakup channel is reflected as an increasing of the imaginary part of the potential as the bombarding energy decreases below the Coulomb barrier, while the real part of the potential (linked to the imaginary part by the dispersion relation) decreases in strength. This behavior is called breakup threshold anomaly (BTA). In this work, we apply this analysis to experimental data for the elastic scattering in the 9Be+80Se systemat eleven bombarding energies around the Coulomb barrier, obtained at the 20 MV tandem accelerator of the TANDAR Laboratory at Buenos Aires. Using the covariance-matrix method to estimate the uncertainties, the presence of the BTA in this system is unambiguously determined, independently of the model chosen for the nuclear potential.

Keywords : elastic scattering; optical models; energy dependence; beryllium 9; selenium 80; threshold energy.

        · abstract in Spanish     · text in English     · English ( pdf )