Renato Higa

University of Bonn, Germany

Coulomb interactions within Halo EFT

Rare exotic nuclei have recently drawn a lot of interest both from experimentalists and theorists, due to properties that challenge the theoretical knowledge gained from studies of stable nuclei. Particularly interesting is the formation of clusters and halo structures, whose small bindings lead to threshold phenomena with important consequences for nuclear astrophysics. In many cases the exitation energy of each cluster is much smaller than the binding among clusters, making them suitable systems for employing Effective Field Theory (EFT) techniques.
Halo EFT has been developed and successfully applied to neutron-alpha scattering [1,2], with a proper account on the P_{3/2} resonance around 1 MeV. However, in many systems Coulomb interactions play a significant role, therefore an extension to Halo EFT which incorporate these effects is highly desirable. We present such an extension based on previous works [3,4], with applications to low-energy proton-alpha [5] and alpha-alpha [6] scattering.

1. C. A. Bertulani, H.-W. Hammer, and U. van Kolck, Nucl. Phys. A712, 37 (2002).
2. P. F. Bedaque, H.-W. Hammer, and U. van Kolck, Phys.Lett. B569, 159 (2003).
3. X. Kong and F. Ravndal, Nucl.Phys. A665, 137 (2000).
4. B.R. Holstein, Phys. Rev. D 60, 114030 (1999).
5. C. A. Bertulani, R. Higa, and U. van Kolck, in progress.
6. H.-W. Hammer, R. Higa, and U. van Kolck, in progress.

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