Pierre Capel

Michigan State University

Theoretical description of breakup reactions of halo nuclei

Since their discovery in the mid-80's halo nuclei have attracted many theoretical and experimental studies. These nuclei indeed exhibit a very peculiar structure: they can be seen as a core containing most of the nucleons to which one or two neutrons are loosely bound. These valence neutrons have a high probability of presence at large distances from the other nucleons, and form a sort of halo around the core. Due to their short lifetime, these nuclei cannot be studied with usual spectroscopic techniques, and one must resort to indirect methods like breakup reactions. In these reactions, the core-halo structure dissociates through interaction with a target. The extraction of reliable structure information from these measurements requires a precise reaction model coupled to an accurate description of the projectile.

In this seminar, I will present the model we have developed and analysed in Brussels to describe successfully reactions involving one-neutron halo nuclei: the Dynamical Eikonal Approximation (DEA) [1]. I will also compare this DEA to another reaction model developed by the Pisa group [2] that we have baptised the Coulomb Corrected Eikonal Approximation (CCE) [3]. This model, being much less time consuming, is particularly well suited to analyse the dissociation of two-neutron halo nuclei [4].

[1] D. Baye, P. Capel, and G. Goldstein, Phys. Rev. Lett. 95, 082502 (2005).
[2] J. Margueron, A. Bonaccorso, and D. M. Brink, Nucl. Phys. A 720, 337 (2003).
[3] P. Capel, D. Baye, and Y. Suzuki, Phys. Rev 68, 054602 (2008).
[4] D. Baye, P. Capel, P. Descouvemont, and Y. Suzuki, Phys. Rev. C 79, 024607 (2009).

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