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Dynamics of the breakup of two-body halo nuclei

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dc.contributor.advisor Lekala, M. L.
dc.contributor.advisor Denikin, A. S.
dc.contributor.author Mukeru, Bahati
dc.date.accessioned 2016-06-29T07:32:16Z
dc.date.available 2016-06-29T07:32:16Z
dc.date.issued 2015-06
dc.identifier.citation Mukera, Bahati (2015) Dynamics of the breakup of two-body halo nuclei, University of South Africa, Pretoria, <http://hdl.handle.net/10500/20711> en
dc.identifier.uri http://hdl.handle.net/10500/20711
dc.description.abstract In this thesis, the first-order and higher-order interferences on the total (Coulomb+nuclear), Coulomb and nuclear breakup cross sections in the 15C+208Pb, 11Be+208Pb breakup reactions are first studied at 68 MeV/u incident energy. It is shown that the first-order interference reduces by more than 60% the total breakup cross sections, by less than 3% the Coulomb breakup cross sections and by more than 85% the nuclear breakup cross sections, for both reactions. On the other hand, the high-order interference is found to reduce by less than 9% the total breakup cross section, less than 1% the Coulomb breakup cross section and less than 7% the nuclear breakup cross section for the 15C+208Pb reaction. For the 11Be+208Pb reaction however, the high-order interference reduces by less than 7% the total breakup cross section, by less than 1% the Coulomb breakup cross section and by less than 4% the nuclear breakup cross section. It is finally shown that even at first-order, the incoherent sum of the nuclear breakup cross sections is more important than the incoherent sum of the Coulomb breakup cross sections for the two reactions. The role of the diagonal and off-diagonal continuum-continuum couplings on total, Coulomb and nuclear breakup cross sections is also investigated for the 8B+58Ni, 8B+208Pb and 19C+208Pb at 29.3, 170.3 MeV and 1273 MeV incident energies respectively. Qualitatively, we found that, the diagonal continuum-continuum couplings are responsible for the large reduction of the differential total and nuclear breakup cross sections at backward angles. At forward angles, this reduction is due to the off-diagonal continuum-continuum couplings. In the absence of these couplings, the nuclear breakup is the more dominant process, while when they are included, the Coulomb breakup becomes dominant. This shows that, the nuclear breakup is more affected by the continuum-continuum couplings than its Coulomb counterpart. Quantitatively, we found that, the off-diagonal countinuum-countinuum couplings reduce by 13.39%, 12.71% and 11.11% the total breakup cross sections for the 8B+58Ni, 8B+208Pb and 19C+208Pb reactions, respectively. en
dc.format.extent 1 online resource (xiv, 130 leaves) : illustrations
dc.language.iso en en
dc.subject Interferences en
dc.subject Integrated breakup cross sections en
dc.subject Continuum-continuum couplings en
dc.subject Differential breakup cross sections en
dc.subject.ddc 530.144
dc.subject.lcsh Two-body problem
dc.subject.lcsh Continuum (Mathematics)
dc.subject.lcsh Nuclear physics
dc.title Dynamics of the breakup of two-body halo nuclei en
dc.type Thesis en
dc.description.department Physics
dc.description.degree D. Phil. (Physics)


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