Recent developments in the eikonal description of the breakup of exotic nuclei

21st International School on Nuclear Physics and Applications & International Symposium on Exotic Nuclei

Capel, P.^1 ; Colomer, F.^1 ; Esbensen, H.^2 ; Fukui, T.^3 ; Johnson, R.C.^4 ; Nunes, F.M.^5 ; Ogata, K.^3

Physique Nuclèaire et Physique Quantique, Universitè Libre de Bruxelles (ULB), C.P. 229, Brussels

B-1050, Belgium^1

Physics Division, Argonne National Laboratory, Argonne

IL

60439, United States^2

Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka

567-0047, Japan^3

Department of Physics, University of Surrey, Guildford

GU2 7XH, United Kingdom^4

National Superconducting Cyclotron Laboratory, Department of Physics and Astronomy, Michigan State University, East Lansing

MI

48824, United States^5

关键词: Coupled channel methods;    Eikonal approximations;    Exotic nuclear structures;    Exotic nuclei;    Exotic structures;    Projectile structures;    Reaction mechanism;    Reaction model;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/724/1/012005/pdf
DOI  :  10.1088/1742-6596/724/1/012005

来源: IOP

【 摘 要 】

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 of15C 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.