Studies of elastic scattering and cross sections of the 12C + 28Si system
Description
Angular distributions of the elastic scattering of the system 12C+28Si were measured at the energies ECM = 14.70; 16.08; 18.90; 20,97; 21.87 MeV, in the angular range 150 ≤ θCM ≤ 1700, with angular steps of 10. Other seven angular distributions measured by Villari, Ost and Cheng at energies ECM = 17.50; 19.60; 20.30; 22.40; 23.80; 24.50 and 25.20 MeV, have also been used in our analysis. The angular distributions have been reproduced by optical model calculations and new optical potentials for the system 12C+28Si were obtained. Calculations of the total reaction cross section from the elastic scattering data using a model independent method were done. The results were compared with fusion cross section data and with total reaction cross sections obtained via optical model calculations. Finally experimental angular distributions were analysed by phase shift analysis and the problem of unicity and ambiguities of the scattering matrix S(l) was discussed. (author)
Availability note (English)
MF available from INIS under the Report Number.Abstract (Portuguese)
Foram medidas distribuicoes angulares para o espalhamento elastico do sistema 12C+28Si nas energias ECM=14.70; 16.08; 18.90; 20.97; 21.87 MeV, na faixa angular 150 ≤ θCM ≤ 1700 com intervalos angulares de 10. Nas analises foram tambem utilizadas outras 7 distribuicoes angulares medidas por Villari, Ost, Cheng, nas energias ECM = 17.50; 19.60; 20.30; 22.40; 23.80; 24.50; 25.20 MeV. As distribuicoes angulares experimentais foram ajustadas por calculos de modelo optico, onde foram encontrados novos potenciais opticos para o sistema em estudo foram encontrados. Tambem calculou-se a secao de choque de reacao a partir do espalhamento elastico, utilizando um metodo independente de modelo. Os resultados obtidos foram comparados com dados de secao de choque de fusao e com a secao de choque de reacao obtida via modelo optico. Finalmente, analisaram-se as distribuicoes angulares experimentais pelo metodo de analise de defasagens e o problema de unicidade e ambiguidades da matriz de espalhamento S(l) e discutida. (autor)Files
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Additional details
Additional titles
- Original title (Portuguese)
- O estudo do espalhamento elastico e da secao de choque de reacao do sistema
Publishing Information
- Imprint Pagination
- 110 p.
- Report number
- INIS-BR--1569
INIS
- Country of Publication
- Brazil
- Country of Input or Organization
- Brazil
- INIS RN
- 20065147
- Subject category
- S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
- Descriptors DEI
- ANGULAR DISTRIBUTION; CARBON 12 REACTIONS; CENTER-OF-MASS SYSTEM; CROSS SECTIONS; ELASTIC SCATTERING; MEV RANGE 10-100; OPTICAL MODELS; SILICON 28 TARGET
- Descriptors DEC
- DISTRIBUTION; ENERGY RANGE; HEAVY ION REACTIONS; MATHEMATICAL MODELS; MEV RANGE; NUCLEAR REACTIONS; SCATTERING; TARGETS