Direct measurement of the 18F(p,alpha)15O reaction for application to nova gamma-ray emission

N. de Séréville 1 C. Angulo 1 P. Leleux 1 A. Coc 2 J. Kiener 2 A. Lefebvre 2 V. Tatischeff 2 P. Descouvemont P. Figuera F. Hammache 3 N.L. Achouri 4 N.A. Orr 4 I. Stefan 5 E. Casajeros T. Davinson D. Robertson A. Laird S. Fox P. Mumby-Croft K. Vaughan
1 UCL - Université Catholique de Louvain
2 CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
3 IPNO - Institut de Physique Nucléaire d'Orsay
4 LPCC - Laboratoire de physique corpusculaire de Caen
5 GANIL - Grand Accélérateur National d'Ions Lourds
Abstract : The 18F nucleus is one of the radioactive isotopes produced during nova explosions. It is of particular interest since it is mainly responsible for the 511 keV gamma-ray emission of novae that could be detected with the INTEGRAL satellite or future gamma-ray telescopes. The amount of 18F synthesised still suffers from large uncertainties coming from missing nuclear information concerning the 18F destruction reaction 18F(p,a)15O. In particular, the interference sign between three 3/2+ resonances in 19Ne, situated slightly above the proton threshold (8 keV and/or 38 keV) and at higher energy (665 keV), is unknown. The maximum effect of these interferences is lying in the energy range corresponding to the Gamow peak region and has a strong impact on the 18F(p,a)15O reaction rate. We report here on the direct measurement at low energy (down to 400 keV in the center-of-mass) of the 18F(p,a)15O total cross section that we performed at the Louvain-la-Neuve CRC-RIB facility with the high-intensity and -purity 18F radioactive beam (T1/2 = 110 min). The total cross section for the different incident energies will be presented and compared to previous experimental data.
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Conference papers
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Submitted on : Thursday, November 25, 2010 - 2:56:55 PM
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N. de Séréville, C. Angulo, P. Leleux, A. Coc, J. Kiener, et al.. Direct measurement of the 18F(p,alpha)15O reaction for application to nova gamma-ray emission. International Symposium on Nuclear Astrophysics -- Nuclei in the Cosmos -- IX, Jun 2006, Genève, Switzerland. ⟨in2p3-00539906⟩

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