Düsseldorf 2007 – scientific programme

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A: Fachverband Atomphysik

A 11: Poster I - Collisions with electrons and ions

A 11.8: Poster

Tuesday, March 20, 2007, 16:30–18:30, Poster B

Cross sections for p - He collisions — •Armin Lühr and Alejandro Saenz — Humboldt-Universität zu Berlin, Institut für Physik, Moderne Optik, Hausvogteiplatz 5-7, D-10117 Berlin

Although the interaction between matter and antimatter has been a fascinating topic for many years, a lot of open questions still remain. In the case of p - He scattering there is a clear discrepancy between experimental and theoretical results at low impact energies (<50 keV). In the near future improved conditions for the production of slow antiproton beams at the new antiproton facility at GSI Darmstadt are expected to provide the basis for new and more reliable experimental data. This gives also new impetus to theoretical investigations which in turn should be useful for the design of this new experimental facility.

We present theoretical results for cross sections of p - He collisions with energies >0.1  keV. The calculations are based on a time-dependent close coupling method. Similar to a previous work [1] we have chosen a configuration-interaction (CI) based one-center approach. However, we expand the one-electron wave function in terms of B-spline functions as has been done in [2] for an effective one-electron treatment. The trajectory of the antiproton is considered to be classical. The consequences of this approximation will be addressed in future work.

[1] A. Igarashi et al., Phys. Rev. A 64, 042717 (2001)

[2] S. Sahoo et al., Nucl. Inst. Phys. Res. B 233, 318 (2005)