A. A. P. Suaide

Reaction mechanisms in the 6Li + 59Co system

Abstract The reactions induced by the weakly bound 6 Li projectile interacting with the intermediate mass target 59 Co were investigated. Light charged particles singles and α – d coincidence measurements were performed at the near barrier energies E lab = 17.4 , 21.5, 25.5 and 29.6 MeV. The main contributions of the different competing mechanisms are discussed. A statistical model analysis, Continuum-Discretized Coupled-Channels (CDCC) calculations and two-body kinematics were used as tools to provide information to disentangle the main components of these mechanisms. A significant contribution of the direct breakup was observed through the difference between the experimental sequential breakup cross section and the CDCC prediction for the non-capture breakup cross section.

Heavy-flavor production and medium properties in high-energy nuclear collisions --What next?

Abstract.Open and hidden heavy-flavor physics in high-energy nuclear collisions are entering a new and exciting stage towards reaching a clearer understanding of the new experimental results with the possibility to link them directly to the advancement in lattice Quantum Chromo-Dynamics (QCD). Recent results from experiments and theoretical developments regarding open and hidden heavy-flavor dynamics have been debated at the Lorentz Workshop Tomography of the Quark-Gluon Plasma with Heavy Quarks, which was held in October 2016 in Leiden, The Netherlands. In this contribution, we summarize identified common understandings and developed strategies for the upcoming five years, which aim at achieving a profound knowledge of the dynamical properties of the quark-gluon plasma.

Reaction mechanisms for weakly-bound, stable nuclei and unstable, halo nuclei on medium-mass targets

An experimental overview of reactions induced by the stable, but weakly-bound nuclei 6Li, 7Li and 9Be, and by the exotic, halo nuclei 6He, 8B, 11Be and 17F on medium-mass targets, such as 58Ni, 59Co or 64Zn, is presented. Existing data on elastic scattering, total reaction cross sections, fusion processes, breakup and transfer channels are discussed in the framework of a CDCC approach taking into account the breakup degree of freedom.

Effect of breakup on elastic scattering for theLi6,7+Co59systems

The elastic scattering for the {sup 6,7}Li+{sup 59}Co systems was investigated in the bombarding energy range 12 MeV{<=}E{sub lab}{<=}30 MeV by means of an analysis using the Sao Paulo potential, through which the behavior of the real and imaginary parts as function of the bombarding energy was established. The experimental results suggest that overall there is an evidence of the usual threshold anomaly for both systems, although for the {sup 6}Li+{sup 59}Co system, an evidence of the breakup threshold anomaly could also be questioned.

6Li direct breakup lifetimes

Abstract α − d coincidence data are studied for the 6 Li + 59 Co reaction at E l a b = 29.6 MeV . A kinematic analysis is used to identify which process, leading to the same final state, has the major contribution for selected angular regions. The contributions of the 6 Li sequential and direct breakup to the incomplete fusion/transfer process is discussed by considering the corresponding lifetimes obtained by using a semiclassical approach.

Projectile breakup dynamics for 6Li + 59Co : Kinematical analysis of \alpha - d coincidences

A study of the kinematics of the

Fusion hindrance in light nuclear systems: binding energy and/or surface diffuseness effect?

\alpha

The Trojan horse method in nuclear astrophysics: Recent results

-d coincidences in the 6Li + 59Co system at a bombarding energy of Elab = 29.6 MeV is presented. With exclusive measurements performed over different angular intervals it is possible to identify the respective contributions of the sequential and direct projectile breakup components. The angular distributions of both breakup components are fairly well described by the Continuum-Discretized Coupled-Channels framework (CDCC). Furthermore, a careful analysis of these processes using a semiclassical approach provides information on both their lifetime and their distance of occurrence with respect to the target. Breakup to the low-lying (near-threshold) continuum is delayed, and happens at large internuclear distances. This suggests that the influence of the projectile breakup on the complete fusion process can be related essentially to the direct breakup to the 6Li high-lying continuum spectrum.

High-pT electron distributions in d+Au and p+p collisions at RHIC

Abstract Systematic studies of fusion barriers for p and light s – d shell nuclei show an increase of the value of their height as the atomic mass number decreases. Two features are observed to be associated to this effect: the low binding energy of a nucleon or cluster and the increase of the nuclear surface diffuseness. The relative competition of these two features is discussed in the present paper.

Open heavy-flavour production at RHIC

Difficulties in cross-section measurements at very low energies, when charged particles are involved, led to the development of some indirect methods. The Trojan horse method (THM) allows us to bypass the Coulomb effects and has been successfully applied to several reactions of astrophysical interest. A brief review of the THM applications is reported together with some of the most recent results.