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Elastic scattering of protons and oxygen ions from light nuclei
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Resumo(s)
This work presents the experimental study of elastic scattering of protons and oxygen
ions, namely of the reactions 6Li(p,p)6Li, 7Li(p,p)7Li, 12C(p,p)12C, 19F(p,p)19F, 31P(p,p)31P, 16O(16O,16O)16O and 12C(16O,16O)12C in the energy range from 1.6 MeV to 3.9 MeV for 12C(p,p)12C scattering, 1 MeV to 2.7 MeV for 6Li(p,p)6Li, 7Li(p,p)7Li and 19F(p,p)19F scattering, 2.6 MeV to 4 MeV for 31P(p,p)31P scattering, 8 MeV for 16O(16O,16O)16O scattering and 2.8 MeV, 5.1 MeV and 8.1 MeV for 12C(16O,16O)12C scattering.
Elastic scattering is always present in nuclear reactions and its study gives us
information that can be used for theoretical calculations. The need for more precise values for the corresponding cross sections gives a motivation for its measurement, along with the measurement at different energies and angles, especially forward ones.
The experimental work has been performed at LATR (Laboratório de Aceleradores e
Tecnologias de Radiação) of CTN-IST (Campus Tecnológico e Nuclear – Instituto Superior Técnico) Sacavém, Portugal. It involved the use of the main experimental facilities of the laboratory. Improvements to the experimental setup needed for the measurements were made. Target preparation and characterization was also subject of intensive study, since it represents a struggle in nuclear experiments especially when high accuracy in measurements is required. Some of the cross sections were measured with more than one target, adding trust to the results obtained. Comparison with theoretical calculations was done, especially with the optical potential parameters available in the literature, showing that these calculations need some fine tuning, mainly for light elements. Our results showed that the accurate measurement of elastic scattering cross sections, especially at forward angles, where there is little data available, can provide reliable information both for obtaining accurate optical model
parameters as well as for the characterization of excited states of nuclides.
Descrição
Palavras-chave
Elastic scattering cross section nuclear reactions protons oxygen