The 18 F(p,α) 15 O reaction is recognized to be one of the most important reactions for nova gammaray astronomy as it governs the early E ≤ 511 keV gamma emission. However in the nova temperature regime, its rate remains largely uncertain due to unknown low-energy resonance strengths. We report here the measurement of the D( 18 F,p) 19 F(α) 15 N one-nucleon transfer reaction, induced by a 14 MeV 18 F radioactive beam impinging on a CD2 target; outgoing protons and 15 N (or α-particles) were detected in coincidence in two silicon strip detectors. A DWBA analysis of the data resulted in new limits to the contribution of low-energy resonances to the rate of the 18 F(p,α) 15 O reaction.
It is shown that the existing data for the different fissioning nuclei on the proton odd-even effect δ p , conditional charge variance σ 2 Z (Z : A) and the light-charged-particle accompanied ternary fission-to-binary fission ratio T /B, can be treated in a coherent way to understand the nature of dynamics that comes into play during the last stages of the fission process through the rupture of the neck joining the nascent fission fragments. * This work forms part of the PhD thesis of B Bouzid and M Djebara.
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