### 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].

References

[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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