16O-12C scattering : description of the gross structure features using an optical model

Measurements of the scattering of 16O on 12C have been made over a limited angular range in the forward and backward hemispheres at laboratory (16O) energies of 80,85,91,93,95,101, 122 MeV. The excitation function of the maximum near 156° (c.m.) has also been measured in steps of ∼ 0.5 MeV between 80 and 101 MeV (lab.). The data were combined with other existing measurements and the gross structure features analyzed using an optical model whose imaginary radius increases with energy [FORMULA]

Parity nonconservation in deuteron photoreactions

We calculate the asymmetries in parity nonconserving deuteron photodisintegration due to circularly polarized photons gamma+d to n+p with the photon laboratory energy ranging from the threshold up to 10 MeV and the radiative capture of thermal polarized neutrons by protons n+p to gamma+d. We use the leading order electromagnetic Hamiltonian neglecting the smaller nuclear exchange currents. Comparative calculations are done by using the Reid93 and Argonne v18 potentials for the strong interaction and the DDH and FCDH "best" values for the weak couplings in a weak one-meson exchange potential. A weak NDelta transition potential is used to incorporate also the Delta(1232)-isobar excitation in the coupled-channels formalism.Comment: 14 pages, 13 figures (18 eps files), LaTeX2

MECANISMES D'INTERACTION DANS LA REACTION 11B (p, α) 8Be (0+)

La réaction 11B (p, α) 8Be (0+) est étudiée à Ep = 12, 20, 24 e t 30 MeV. Une analyse par ondes planes réalisée en tenant compte des processus de "Pick- up" et "heavy particle pick up" retraduit assez fidèlement les résultats expérimentaux.The 11 B (p. α) 8Be (0+) reaction has been studied at Ep = 12, 20, 24 and 30 MeV. Phane wasve analysis taking account the pick - up and heavy particle pick - up processes fits fairly well the experimental results

MECANISMES DES REACTIONS NUCLEAIRES 9Be (p, p) 9Be ET 9Be(p, α0)6Li A BASSE ENERGIE

Les réactions nucléaires à basse énergie 9Be (p, p) et 9Be(p, α) ont été étudiées. La diffusion élastique a été analysée par un formalisme de noyau composé, la réaction (p, α) à l'aide d'une théorie d'interférence entre un mécanisme direct "knock on" et une résonance (JΠ = 2-).The low energy reactions 9Be (p, p) and 9Be(p, α ) was studied. The elastic scattering was analysed with a compound nucleus formalism, the (p, α) reaction with a theory of interference between a direct mechanism "knock on" and a resonance (JΠ = 2-)