Speaker
Ms
Chloë Hebborn
(Université libre de Bruxelles)
Description
The development of Radioactive-Ion Beams (RIBs) in the early 80s has enabled the study of exotic nuclei far from stability. Halo nuclei are among the most peculiar structures discovered since then, they have one or two loosely-bound nucleons which tunnel far from the core of the nucleus, causing their matter radius to be much larger than stable nuclei [1]. Their short lifetimes make their analysis through usual spectroscopic techniques impossible, therefore indirect methods, such as reaction processes, have to be used. To infer precise information about the structure of these exotic nuclei from reaction measurements, an accurate reaction model coupled to a realistic description of the nucleus is needed. The eikonal model provides a simple interpretation of the collision and is very efficient from a computational point-of-view. However, it has several flaws: it does not treat properly the dynamics of the projectile during the reaction, in its standard form it has convergence issues to compute breakup observables due to the Coulomb interaction and it is valid only at energies higher than 50 MeV/nucleon. In this work, we study corrections to the eikonal model to address these issues and we analyse their efficiencies in the cases of elastic scattering and breakup of one-neutron halo nuclei. As experimental facilities such as HIE-ISOLDE at CERN
and ReA12 at MSU provide RIB around 10 MeV/nucleon, extending the validity of the eikonal model to such energies would be of great interest. To do so, we study two corrections which aim to improve the deflection of the projectile due to its interaction with the target. The first correction relies on a semi-classical approach [2] while the second is based on an exact correspondence with the partial-wave expansion [3]. Both corrections improve the elastic-scattering of one-neutron halo
nuclei at 10 MeV/nucleon but fails to describe breakup observables [4,5]. We have also studied corrections to better account for the dynamics of the projectile during the collision. This might improve the eikonal analyses of inclusive measurements of breakup reactions.
[1] I. Tanihata, J. Phys. G **22**, 157 (1996).
[2] C. E. Aguiar, F. Zardi, and A. Vitturi, Phys. Rev. C **56**, 1511 (1997).
[3] J. M. Brooke, J. S. Al-Khalili, and J. A. Tostevin, Phys. Rev. C **59**, 1560 (1999).
[4] C. Hebborn and P. Capel, Phys. Rev. C **96**, 054607 (2017).
[5] C. Hebborn and P. Capel, Phys. Rev. C **98**, 044610 (2018).
Primary author
Ms
Chloë Hebborn
(Université libre de Bruxelles)
Co-author
Prof.
Pierre Capel
(Université Libre de Bruxelles (ULB))
