Experimental determination of the 7Be + p scattering lengths

The 7Be + p elastic cross section has been measured at the Centre de Recherches du Cyclotron RIB facility at Louvain-la-Neuve in the c.m. energy region from 0.3 to 0.75 MeV by bombarding a proton-rich target with a radioactive 7Be beam. The recoil protons have been detected in the angular range θc.m. = 120.2°-131.1° and θc.m. = 156.6°-170.2° using the LEDA system. From a R-matrix analysis of the cross section data, we obtain the energy and the width of the 1+ resonance (Ex = 0.77 MeV). The ℓ = 0 scattering lengths a01 = 25±9 fm (channel spin I = 1) and a02 =-7 ± 3 fm (channel spin I = 2) have been deduced. They are compared to values expected from charge-symmetry properties. Implications on the low energy S-factor of the 7Be(p,γ)8B reaction are discussed. © 2003 Elsevier Science B.V. All rights reserved.SCOPUS: re.jinfo:eu-repo/semantics/publishe

The 18F(p,α) reaction and its astrophysical implications

18F radioactive beams were used to measure the 18F(p,α) reaction in the c.m. energy ranges of 265-535 keV and 550-740 keV. In each case, a resonant level was clearly detected, of which the resonant strength and some other properties were deduced. The astrophysical reaction rate was calculated down to the novae peak temperature. Consequences for the hot CNO cycles were drawn. © 1997 Elsevier Science B.V.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Identification of a new low-lying state in the proton drip line nucleus 19Na

The second excited state (Jπ = 1/2,+, l = 0) of the proton-rich nucleus 19Na has been observed for the first time using the elastic scattering reaction 1H(18Ne, 1H) 18Ne. An intense (4 × 106 pps) 18Ne radioactive beam was produced at the CRC-RIB facility at Louvain-la-Neuve to bombard a polyethylene target. The recoil protons were detected at 20 different angles in the LEDA segmented silicon detector. The resulting elastic scattering cross sections have been analyzed using a global R-matrix. fit. We find that the second excited state in 19Na lies at the center-of-mass energy Ec.m. = 1.066±0.003 MeV with respect to the 18Ne+p threshold, and has a proton width Γp = 101±3 keV. The Coulomb shift between the 1/2+ mirror levels in 19O and 19Na is 0.73 MeV, among the largest values currently observed in light exotic nuclei.info:eu-repo/semantics/publishe

Spectroscopy of the proton drip line nucleus 19Na by 1H(18Ne,p)18Ne elastic scattering

We have studied the resonant elastic scattering reaction 18Ne+p in reverse kinematics, by using the intense (4 × 106 pps) 18Ne radioactive beam at the Centre de Recherches du Cyclotron RIB facility at Louvain-la-Neuve. The recoil protons were detected at 20 different angles in the LEDA segmented silicon detector. The resulting elastic scattering cross sections have been analysed using the R-matrix method. We have observed for the first time the second excited state (Jπ = 1/2+, ℓ = 0) of the proton-rich nucleus 19Na at the center-of-mass energy Ec.m. = 1.066 ± 0.003 MeV with a proton width Γp = 101 ± 3 keV. The Coulomb shift between the 1/2+ mirror levels in 19O and 19Na is 0.73 MeV, among the largest values currently observed in light exotic nuclei.info:eu-repo/semantics/publishedNuclear physics in astrophysics. Proceeding, XVIIth International Nuclear Physics Divisional Conference of the European Physical Society, Debrecen (Houngary), 30 September - 4 October 200

Aspects of the Louvain-la-Neuve results and projects

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Low-energy states in 11N and the two-proton emission of 12O

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

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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