Speaker
Nicolas de Sereville
(Universite catholique de Louvain)
Description
The 18F nucleus is one of the radioactive isotope produced during nova explosions. It
is of particular interest since it is the main responsible for the 511 keV gamma-ray
emission of novae that could be detected with the INTEGRAL satellite or future
gamma-rays telescope. The amount of 18F synthesised still suffers from large
uncertainties coming from missing nuclear information concerning the destruction
reaction of 18F: 18F(p,alpha)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, having a strong impact on the
18F(p,alpha)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,alpha)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). Total cross-section for the different incident energies will
be presented and compared to previous experimental data, followed by a R-matrix
analysis aiming at the determination of the interference sign of the relevant resonances.
Primary author
Nicolas de Sereville
(Universite catholique de Louvain)
Co-authors
Alain Coc
(Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse)
Alison Laird
(University of York)
Anne Lefebvre
(Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse)
Carmen Angulo
(Universite catholique de Louvain)
Doug Robertson
(University of Edinburgh)
Enrique Casarejos
(Universite catholique de Louvain)
Fairouz Hammache
(Institut de Physique Nucleaire d'Orsay)
Jurgen Kiener
(Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse)
Kelly Vaughan
(University of York)
Lynda Achouri
(Laboratoire de Physique Corpusculaire)
Nigel Orr
(Laboratoire de Physique Corpusculaire)
P. Mumby-Croft
(University of York)
Pierpaolo Figuera
(Laboratori Nazionali del Sud)
Pierre Leleux
(Universite catholique de Louvain)
Simon Fox
(University of York)
Thomas Davinson
(University of Edinburgh)
Vincent Tatischeff
(Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse)
