Abstract
The study of exotic nuclear structures, such as halo nuclei, is usually performed through nuclear reactions. An accurate reaction model coupled to a realistic description of the projectile is needed to correctly interpret experimental data. In this contribution, I briefly summarise the assumptions made within the modelling of reactions involving halo nuclei. I describe briefly the Continuum-Discretised Coupled Channel method (CDCC) and the Dynamical Eikonal Approximation (DEA) in particular and present a comparison between them for the breakup of 15C on Pb at 68AMeV. I show the problem faced by the eikonal approximation at low energy and detail a correction that enables its extension down to lower beam energies. A new reaction observable is also presented. It consists of the ratio between angular distributions for two different processes, such as elastic scattering and breakup. This ratio is completely independent of the reaction mechanism and hence is more sensitive to the projectile structure than usual reaction observables, which makes it a very powerful tool to study exotic structures far from stability.
Highlights
The development of radioactive-ion beams in the mid-80s has enabled us to study the structure of nuclei away from stability
We review the theoretical framework of the usual reaction models and describe in particular the Continuum Discretise Coupled Channel model (CDCC) [3, 4] and the Dynamical Eikonal Approximation (DEA) (Sec. 2) [6, 7]
The resulting DEA calculation is in perfect agreement with the Continuum-Discretised Coupled Channel method (CDCC) calculation. This shows that the range of validity of the DEA can be reliably extended down to low energy
Summary
The development of radioactive-ion beams in the mid-80s has enabled us to study the structure of nuclei away from stability. Being located close to the drip lines, halo nuclei exhibit very short lifetimes, which impedes the use of regular spectroscopic techniques in their study To study these fascinating structures, we must rely on indirect techniques such as elastic scattering or breakup. Albeit precise, these models rely on inputs, such as optical potentials, which can significantly affect the theoretical predictions. These models rely on inputs, such as optical potentials, which can significantly affect the theoretical predictions To avoid this dependence a new reaction observable has been recently proposed.
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