61 research outputs found
Indirect study of 19Ne states near the 18F+p threshold
The early E < 511 keV gamma-ray emission from novae depends critically on the
18F(p,a)15O reaction. Unfortunately the reaction rate of the 18F(p,a)15O
reaction is still largely uncertain due to the unknown strengths of low-lying
proton resonances near the 18F+p threshold which play an important role in the
nova temperature regime. We report here our last results concerning the study
of the d(18F,p)19F(alpha)15N transfer reaction. We show in particular that
these two low-lying resonances cannot be neglected. These results are then used
to perform a careful study of the remaining uncertainties associated to the
18F(p,a)15O and 18F(p,g)19Ne reaction rates.Comment: 18 pages, 8 figures. Accepted in Nuclear Physics
Charged-Particle Thermonuclear Reaction Rates: III. Nuclear Physics Input
The nuclear physics input used to compute the Monte Carlo reaction rates and
probability density functions that are tabulated in the second paper of this
series (Paper II) is presented. Specifically, we publish the input files to the
Monte Carlo reaction rate code RatesMC, which is based on the formalism
presented in the first paper of this series (Paper I). This data base contains
overwhelmingly experimental nuclear physics information. The survey of
literature for this review was concluded in November 2009.Comment: 132 page
Crossing the Dripline to 11N Using Elastic Resonance Scattering
The level structure of the unbound nucleus 11N has been studied by 10C+p
elastic resonance scattering in inverse geometry with the LISE3 spectrometer at
GANIL, using a 10C beam with an energy of 9.0 MeV/u. An additional measurement
was done at the A1200 spectrometer at MSU. The excitation function above the
10C+p threshold has been determined up to 5 MeV. A potential-model analysis
revealed three resonance states at energies 1.27 (+0.18-0.05) MeV (Gamma=1.44
+-0.2 MeV), 2.01(+0.15-0.05) MeV, (Gamma=0.84 +-$0.2 MeV) and 3.75(+-0.05) MeV,
(Gamma=0.60 +-0.05 MeV) with the spin-parity assignments I(pi) =1/2+, 1/2- and
5/2+, respectively. Hence, 11N is shown to have a ground state parity inversion
completely analogous to its mirror partner, 11Be. A narrow resonance in the
excitation function at 4.33 (+-0.05) MeV was also observed and assigned
spin-parity 3/2-.Comment: 14 pages, 9 figures, twocolumn Accepted for publication in PR
A partir d'un solénoïde et d'un filtre de Wien, il est possible de concevoir un séparateur de recul pour étudier des réactions de capture radiative d'intérêt astrophysique
Doctorat en sciences physiques -- UCL, 199
Etude de la diffusion résonnante proton-noyau par la méthode de la cinématique inverse
Doctorat en sciences physiques -- UCL, 199
Nuclear astrophysics experiments: Reactions and elastic scattering
Experimental methods in nuclear astrophysics experiments
with radioactive beams are described, and evaluated. The
importance of performing the (p, p) elastic scattering in parallel
to a (p, ) or a (p, ) reaction is emphasized
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