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.
References:
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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