Measurement of 19Ne spectroscopic properties via a new method of inelastic scattering to study novae

The accuracy of the predictions of the γ flux produced by a classical nova during the first hours after the outburst is limited by the uncertainties on several reaction rates, including the 18F(p,α)15O one. Better constraints on this reaction rate can be obtained by determining the spectroscopic properties of the compound nucleus 19Ne. This was achieved in a new inelastic scattering method using a 19Ne radioactive beam (produced by the GANIL-SPIRAL 1 facility) impinging onto a proton target. The experiment was performed at the VAMOS spectrometer. In this article the performances (excitation energy range covered and excitation energy resolution) and limitations of the new technique are discussed. Excitation energy resolution of σ = 33 keV and low background were obtained with this inverse kinematics method, which will allow extracting the spectroscopic properties of 19Ne

Study of the 26Al(n,p)26Mg and 26Al(n,α)23Na reactions using the 27Al(p,p')27Al inelastic scattering reaction

26Al was the first cosmic radioactivity ever detected in the galaxy as well as one of the first extinct radioactivity observed in refractory phases of meteorites. Its nucleosynthesis in massive stars is still uncertain mainly due to the lack of nuclear information concerning the 26Al(n,p)26Mg and 26 Al(n,α)23Na reactions. We report on a single and coincidence measurement of the 27Al(p,p')27Al(p)26Mg and 27Al(p,p')27Al(α)23Na reactions performed at the Orsay TANDEM facility aiming at the spectroscopy study of 27Al above the neutron threshold. Fourteen states are observed for the first time within 350 keV above the 26Al+n threshold

Reaction dynamics studies for the system 7Be + 208Pb at Coulomb barrier energies

The scattering process of the Radioactive Ion Beam 7 Be from a 208 Pb target was measured at three near-barrier energies. The quasi-elastic angular distributions were analyzed within the framework of the optical model to extract the reaction cross sections. The results are compared with those obtained for the reactions induced by the mirror projectile 7 Li and by the lightest particle-stable lithium isotope 6 Li on the same target. The angular distributions for the production of the two 7 Be constituent clusters, namely 3 He and 4 He, were also measured. In agreement with what observed for the interaction of 7 Be with lighter targets, the production of the heavier helium isotope resulted to be much more abundant than that of its lighter counterpart

Scattering of light halo nuclei on heavy target at energies around the Coulomb barrier

We report here on experiments performed at TRIUMF to study the scattering of the light halo nuclei 11Li on lead at energies below and around the Coulomb barrier. The the elastic and break-up differential cross section are interpreted in the framework of Continuum-Discretized Coupled-Channel calculations. The departure from Rutherford scattering at energies below the barrier is well beyond the behavior of normal nuclei

Scattering of light halo nuclei on heavy target at energies around the Coulomb barrier

We report here on experiments performed at TRIUMF to study the scattering of the light halo nuclei 11Li on lead at energies below and around the Coulomb barrier. The the elastic and break-up differential cross section are interpreted in the framework of Continuum-Discretized Coupled-Channel calculations. The departure from Rutherford scattering at energies below the barrier is well beyond the behavior of normal nuclei

Probing the cluster structure of Li 7 via elastic scattering on protons and deuterons in inverse kinematics

Elastic scattering measurements were performed for the Li7+p system in inverse kinematics at energies of 16, 25, 35, and 38.1 MeV and for the Li7+d system at 38.1 MeV. The heavy ejectiles were detected by the large acceptance MAGNEX spectrometer at the Laboratori Nazionali del Sud in Catania, Italy. The results are analyzed using the Jeukenne-Lejeune-Mahaux and continuum discretized coupled channel frameworks. In the latter case the cluster structure of Li7 proves to be critical for the theoretical interpretation of the experimental results

Elastic scattering measurements for the system 7Be + 28Si at 17.2 MeV

Elastic scattering of 7Be+28Si was studied at several near barrier energies for probing the energy dependence of the optical potential. Our analysis at 17.2 MeV will be presented in this article and discussed, in terms of Continuum Coupled Channel Calculations (CDCC). This research is part of a long term plan concerning the energy dependence of the optical potential for weakly bound projectiles, at near barrier energies and for probing the potential threshold anomaly. The experiment took place at the EXOTIC facility - Laboratori Nationali di Legnaro (LNL), and refers to an angular distribution measurement, using the detector array EXPADES (Exotic Particle Detection System). Results at 9 MeV (Rutherford region) were also analyzed and were used for estimating the solid angle. Our analysis for other energies is under process

Study of the 6Li + p → \rightarrow 3He + 4He reaction in inverse kinematics

Angular distribution measurements were performed for the 6Li + p$\rightarrow$3He + 4He reaction in inverse kinematics at incident energies of 2.7, 3.3, 4.2 and 4.8MeV/u. The detection of both recoils ( 3He and 4He over the laboratory angle range $\theta_{lab}=16^{\circ}$ to $34^{\circ}$ allowed the determination of the angular distribution over a wide angular range in the center-of-mass frame ( $\theta_{c.m.}\sim 40^{\circ}$ to $140^{\circ}$. The results clarify inconsistencies between existing data sets and are consistent with compound nucleus model calculations. © 2015, SIF, Springer-Verlag Berlin Heidelberg

Probing the cluster structure of 7Li via elastic scattering on protons and deuterons in inverse kinematics

Elastic scattering measurements were performed for the Li7+p system in inverse kinematics at energies of 16, 25, 35, and 38.1 MeV and for the Li7+d system at 38.1 MeV. The heavy ejectiles were detected by the large acceptance MAGNEX spectrometer at the Laboratori Nazionali del Sud in Catania, Italy. The results are analyzed using the Jeukenne-Lejeune-Mahaux and continuum discretized coupled channel frameworks. In the latter case the cluster structure of Li7 proves to be critical for the theoretical interpretation of the experimental results