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Pre-equilibrium helion emission induced by protons
Thesis (PhD (Physics))--University of Stellenbosch, 2006.
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Stellenbosch : University of Stellenbosch
2008
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| _version_ | 1867613751145922560 |
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| access_status_str | Open Access |
| author | Bezuidenhout, Jacques |
| author2 | Cowley, A. A. |
| author_browse | Bezuidenhout, Jacques Cowley, A. A. |
| author_facet | Cowley, A. A. Bezuidenhout, Jacques |
| author_sort | Bezuidenhout, Jacques |
| collection | Thesis |
| dc_rights_str_mv | University of Stellenbosch |
| description | Thesis (PhD (Physics))--University of Stellenbosch, 2006. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/1307 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:41:06.301Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2008 |
| publishDateRange | 2008 |
| publishDateSort | 2008 |
| publisher | Stellenbosch : University of Stellenbosch |
| publisherStr | Stellenbosch : University of Stellenbosch |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/1307 Pre-equilibrium helion emission induced by protons Bezuidenhout, Jacques Cowley, A. A. University of Stellenbosch. Faculty of Science. Dept. of Physics. Composite particles -- Emission Helion -- Emission Dissertations -- Physics Theses -- Physics Thesis (PhD (Physics))--University of Stellenbosch, 2006. This thesis is devoted to a study of the 93Nb( p r ,3He) and 59Co( p r ,3He) reactions at incident energies of 100 MeV, 130 MeV and 160 MeV. Double differential cross sections and analysing power distributions were measured from a threshold of ~30 MeV up to the kinematic maximum and at scattering angles between 15º and 120º. The experimental data were compared with theoretical calculations done by combining a statistical multistep theory with a deuteron pickup mechanism in the final stage. The contribution of the first three steps towards the total double differential cross section and analysing power was assessed. The theory described the experimental double differential cross section and analysing power data reasonably well over all incident and scattered energies and for both target nuclei. As the incident energy was increased, the characteristics of the reaction mechanism also remained consistent. Thus the results supported the underlying multistep-pickup theory. The two target nuclei demonstrated similar responses, suggesting these two share the same basic reaction mechanism. The total double differential cross section for the reaction dropped with an increase in incident energy. At a fixed emission energy, near the maximum allowed value, the slope of the double differential cross section increased with an increase in incident energy, resulting in the dominance of forward peaked reactions at higher incident energies. The sensitivity of analysing power to the multistep part of the reaction was valuable to the study. Forward-peaked contributions that were associated with single step direct reactions resulted in large analysing power values at small scattering angles, and values dropped to around zero at large angles. The analysing power also appeared to decrease to values approximating zero as the incident energy was increased to 160 MeV. Furthermore, this study also confirmed the dominance of higher step mechanisms at high excitation energies, irrespective of incident energy. In general the results were in agreement with the predicted properties of the assumed reaction mechanism at all incident and emission energies, which inspires confidence that the theoretical interpretation is likely to be correct. Doctoral 2008-01-23T08:02:25Z 2010-06-01T08:18:08Z 2008-01-23T08:02:25Z 2010-06-01T08:18:08Z 2006-12 Thesis http://hdl.handle.net/10019.1/1307 en University of Stellenbosch 2166205 bytes application/pdf application/pdf Stellenbosch : University of Stellenbosch |
| spellingShingle | Composite particles -- Emission Helion -- Emission Dissertations -- Physics Theses -- Physics Bezuidenhout, Jacques Pre-equilibrium helion emission induced by protons |
| title | Pre-equilibrium helion emission induced by protons |
| title_full | Pre-equilibrium helion emission induced by protons |
| title_fullStr | Pre-equilibrium helion emission induced by protons |
| title_full_unstemmed | Pre-equilibrium helion emission induced by protons |
| title_short | Pre-equilibrium helion emission induced by protons |
| title_sort | pre equilibrium helion emission induced by protons |
| topic | Composite particles -- Emission Helion -- Emission Dissertations -- Physics Theses -- Physics |
| url | http://hdl.handle.net/10019.1/1307 |
| work_keys_str_mv | AT bezuidenhoutjacques preequilibriumhelionemissioninducedbyprotons |