New low-energy measurement of the F-18(p, alpha)O-15 reaction
(2007) 7th International Conference on Radioactive Nuclear Beams — Location: Cortina(Italy) (2.July.2006)
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- Abstract
- The F-18, produced during nova explosions, is the main responsible for the 511 keV gamma-ray emitted during the outburst that could be detected with satellite missions or future gamma-ray telescopes. In spite of many experimental efforts, the amount of F-18 synthesized still suffers from large uncertainties concerning mainly the F-18(p, alpha)O-15 reaction. We report here on a new direct measurement of the F-18(p, alpha)O-15 cross section recently carried out at the RIB facility at Louvain-la-Neuve. Cross section data down to a center-of-mass energy of 400 keV have been obtained using an isobarically pure F-18 beam ( averaged intensity of the order of 10(6) pps) and a thin polyethylene target. The reaction products were detected using the multi-strip detector array LEDA. The cross section data are analysed in the framework of the R-matrix model. Our main aim is to determine the interference sign between three 3/2(+) resonances above threshold that can significantly affect the extrapolation of the F-18(p, alpha)O-15 cross section to the energies relevant for novae, and thus, the modeling of nova explosions.
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de Sereville, N., Angulo, C., Coc, A., Achouri, N. L., Casarejos, E., Davinson, T., Descouvemont, P., Figuera, P., Fox, S., Hammache, F., Kiener, J., Laird, A., Lefebvre, A., Leleux, P., Mumby-Croft, P., Orr, N., Robertson, D., Vaughan, K., & Tatischeff, V. (2007). New low-energy measurement of the F-18(p, alpha)O-15 reaction. The European Physical Journal. Special Topics, 150, 211-214. https://doi.org/10.1140/epjst/e2007-00306-5 (Original work published 2007)