Bonn 2010 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 7: Instrumentierung I

HK 7.5: Vortrag

Montag, 15. März 2010, 17:45–18:00, JUR B

First double polarized photoproduction on a 3He target at MAMI — •Jochen Krimmer1, Juergen Ahrens1, Patricia Aguar-Bartolomé1, Hans-Juergen Arends1, Werner Heil2, Sergei Karpuk2, Paolo Pedroni3, and Zahir Salhi21Institut für Kernphysik, Universität Mainz — 2Institut für Physik, Universität Mainz — 3INFN, Sezione di Pavia, Italy

The use of a polarized 3He target for a double polarized photoproduction experiment, compared to existing data on the deuteron, gives a complementary and more direct access to the neutron, due to the spin structure of 3He.

A first experiment with a polarized 3He target has been performed in July 2009 at the tagged photon facility of the MAMI accelerator. Polarized 3He has been provided by a polarizer based on the principle of metastability exchange optical pumping. Inside the Crystal Ball detector a solenoid generated a homogeneous magnetic holding field for the target cell filled with the polarized gas. Due to the lack of space inside the detector, polarimetry has been performed outside the detector on the upstream side. A remote controlled polarization measurement has been realized via an automatic transport system which moved the target cell between the two positions.

In this talk the experimental setup and its performance under beam conditions will be given, as well as the status of data analysis.

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