The F-18(p,alpha)O-15 reaction is recognized to be one of the most important reactions for nova gamma-ray astronomy, as it governs the early Eless than or equal to511 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 H-2(F-18,p)F-19(alpha)N-15 one-nucleon transfer reaction, induced by a 14-MeV F-18 radioactive beam impinging on a CD2 target; outgoing protons and N-15 (or alpha particles) were detected in coincidence in two silicon strip detectors. A distorted-wave Born approximation analysis of the data resulted in new limits to the contribution of low-energy resonances to the rate of the F-18(p,alpha)O-15 reaction.
H-2(F-18,p alpha)N-15 reaction applied to nova gamma-ray emission
CHERUBINI, SILVIO;
2003-01-01
Abstract
The F-18(p,alpha)O-15 reaction is recognized to be one of the most important reactions for nova gamma-ray astronomy, as it governs the early Eless than or equal to511 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 H-2(F-18,p)F-19(alpha)N-15 one-nucleon transfer reaction, induced by a 14-MeV F-18 radioactive beam impinging on a CD2 target; outgoing protons and N-15 (or alpha particles) were detected in coincidence in two silicon strip detectors. A distorted-wave Born approximation analysis of the data resulted in new limits to the contribution of low-energy resonances to the rate of the F-18(p,alpha)O-15 reaction.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
