Tübingen 2003 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 18: Instrumentation und Anwendungen II
HK 18.10: Vortrag
Dienstag, 18. März 2003, 17:45–18:00, C
Nuclear Polarization Measurement of H/D Atoms Extracted from a Storage Cell — •Ralf Engels1, Hans Paetz gen. Schieck2, Frank Rathmann1, Hellmut Seyfarth1, Alexandre Vassiliev3, Tobias Ullrich1, and Sergey Yaschenko1,4 — 1Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich — 2Institut für Kernphysik, Universität zu Köln — 3St. Petersburg Nuclear Physics Institute, 188300 Gatchina, Russia — 4Physikalisches Institut 2, Universität Erlangen
The occupation numbers of the individual hyperfine substates in a beam of hydrogen or deuterium atoms are measured with a Lamb-shift polarimeter. Therefore, the nuclear polarization of an atomic beam can be determined with high precision of about 1% in 30 s. The measurements are carried out with the atomic beam source for the polarized target at ANKE (I ∼ 7× 1016 atoms/s). The polarization of a slow (500 - 2000 eV) ion beam with currents higher than 20 nA can be measured as well.
When the intensity of the atomic beam is reduced by a factor of 100, the statistical error is increased, but the Lamb-shift polarimeter still provides a precise measurement with an error of about 2% in 30 s. Therefore, in order to determine the polarization of the atoms inside a storage cell gas target, it is sufficient to extract a small number of atoms from the cell. First results obtained with a simple teflon cell are presented. Planned studies to optimize the polarization measurement are discussed as well.