Nuclear astrophysics studies with radioactive Beams in Louvain-La-Neuve

info:eu-repo/semantics/publishe

Resonant scattering of a 19Ne beams on a H-target

info:eu-repo/semantics/publishe

Measurements of the 19Ne(p,y) reaction rate using radioactive BEAMS

info:eu-repo/semantics/publishe

First experimental eimit on the Ne19(p,γ)Na20 resonance strength, of astrophysical interest

The 19Ne(p, γ)20Na reaction may influence considerably the reaction flow between the CNO and NeNa mass regions in high temperature hydrogen burning conditions. The 447 keV resonance has been studied by exploiting radioactive 19Ne beams with novel detection techniques to measure β+ -delayed α radioactivity of 20Na nuclei produced in reactions with polyethylene targets. A 90% C.L. upper limit of 18 meV for the resonance strength has been determined and implications for the spin assignment of the 2.646 MeV state in 20Na and the stellar reaction rate are discussed.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

The 19Ne(p,γ)20Na astrophysical reaction rate determined from measurements with a radioactive beam

The 19Ne(p,γ)20Na as well as the 19Ne(d,n)20Na reaction have been studied in inverse kinematics using 19Ne radioactive beams. Upper and lower limits for the 19Ne(p,γ)20Na astrophysical reaction rate have been deduced, for the first time on the basis of direct experimental data. It is concluded that the transition from the hot-CNO cycle to the rp-process in explosive hydrogen burning is most likely governed by the preceeding 15O(a,γ)19Ne reaction.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Nuclear reactions of astrophysical interest with radioactive beams

The ARENAS3 facility, coupling the two cyclotrons of Louvain-la-Neuve, is intensively been used over the past years for cross-section measurements of nuclear reactions of astrophysical interest. We will describe the characteristics of the available beams and the experiments going on using these beams. The 19Ne(p,γ)20Na reaction, of considerable importance for the reaction flow between the CNO and the NeNa mass region in high-temperature hydrogen burning conditions, will be discussed in particular. The proposed low-energy resonance at 0.447 MeV has been measured in inverse kinematics using novel activation techniques. An upper limit (90% C.L.) of 18 meV is obtained for the strength of this first particle-unbound state of 20Na together with preliminary values for the strength of the higher excited states. © 1995.SCOPUS: ar.jinfo:eu-repo/semantics/publishe