A direct measurement of the 18F(p,α) 15O reaction

First application of the Trojan horse method with a radioactive ion beam: Study of the18F(p,α)15Oreaction at astrophysical energies

“…The γ-ray emission following the nova explosion is dominated by the 511 keV energy line, coming from the annihilation of positrons produced by the decay of radioactive nuclei. Among them, 18 F is especially important because of its expected abundance in the Nova environment and because of its lifetime, that matches well with the timescale for the Nova ejecta to become transparent to γ-ray emission. In order γ-ray astronomy to be helpful in understanding the Nova explosion phenomena, it is then crucial to know the rate of the nuclear reactions producing and destroying 18 F. Indeed, at relevant temperatures (T 9 ≈ 0.2 − 0.4), which corresponds to Gamow windows energies in the center-of-mass of E c.m.…”

19Ne levels studied with the18F(d,n)Adekola1, Brune2, Bardayan3 et al. 2012Phys. Rev. C

“…The reaction rate is dominated by s-and p-wave resonances in 19 Ne arising from states near the proton threshold at 6411 keV. Despite years of measurements with stable and radioactive beams to better understand this reaction [1][2][3][4][5][6][7][8][9], the cross section has only been measured directly down to ∼250 keV [10]. Large uncertainties remain due to the unknown properties of levels near the proton threshold and unknown characteristics of the interference between the J π = 3/2 + resonances.…”

Radioactive ion beam physics at the cyclotron research centre Louvain-la-Neuve

“…A series of experiments focussed on reactions with E c.m. above 550 keV [40,41,42]. Evidence for a resonance at 330 keV was found; the strength was later measured at the HRBIF facility [27].…”